Surface Systems & Instruments, Inc.

Inertial Profiling Systems

From one to eight profile lasers, SSI’s inertial profilers will meet or exceed your project specifications.

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Features & Benefits

 

Modular Design

Each SSI hardware platform uses the same set of core data collection components. The modular design allows for rapid response support, as all key components are field replaceable, “plug-and-play,” and express shippable.

 

Proven Repeatability & Accuracy

The SSI system utilizes a proprietary digital data collection architecture that generates surface profile data with proven repeatability and accuracy—matching or exceeding any competing device. SSI’s performance has been proven by worldwide compliance with agency specifications and test methods. The SSI system is a Class I profiling device under ASTM E950 at all collections speeds from 5 mph to 70 mph (8-112 kph). SSI’s systems not only comply with, but are guaranteed to meet or exceed applicable specifications and certification requirements worldwide. This includes US Federal and State DOT, Ministries of Transportation, ASTM and AASHTO (M328, R054, R056-R057) and World Bank standards.

SSI Inertial Profiler Certification 

 

Unmatched Precision

SSI’s inertial profiling systems can pinpoint localized roughness (bumps and dips) with unrivaled precision. Running different brands of profilers over a test surface using artificial bumps placed at random locations has proven the superior ability of the SSI system to reproduce the exact length and height of bumps and dips. SSI’s higher precision profile data facilitates new and useful solutions—from real time navigation along pavement profiles to pin-point the edges of mark localized roughness—to enabling operators of grinders and mills to adjust their machines according changes in surface profiler. Contact SSI for more details on these innovate solutions.

 

Innovative Software

The profiling system is based off of a Windows operating system powered by a Panasonic Toughbook. The calibration and data collection routines are simple and computer instructed. Raw data streams on-screen and is backed up in real time during data collection. The SSI Profiler data analysis program has evolved since 1995 through development based on end-user input. The result; a refined program with analysis functions that is supplied to SSI customers for use onboard the profiling device and on desktop computers. The SSI Profiler program is free to transportation agency and academic users. Profile data is created in various formats, including PPF and ERD (fully compatible with ProVal), PDF and Excel. SSI’s Data Validation Engine software allows for fast comparison of data from repeat profile collections. Outputs include profile repeatability, accuracy, and cross-correlation, as well as comparisons of elevations, raw sensor data, and GPS content.

 

Wide Footprint Lasers

While SSI’s profilers with single point or “spot” lasers are fine for dense asphalt surfaces, a more advanced laser has evolved for measuring pavements with grooves, tines or coarse textures. Those surfaces achieve a more accurate profile using a wide-footprint laser (the LMI Technologies “Gocator” sensor sampling at 5kHz or equivalent). The Roline and Gocator lasers were developed to minimize the artificial impact of single point lasers on concrete or other pavement finishes with significant texture attributes, such as longitudinal tines or grooves from diamond grinding. The line lasers collects height measurements using 4 inch/100 mm lateral sampling of the surface, as compared to spot lasers that sample using a beam no wider than about .25” (6.35mm). SSI’s Roline and Gocator profilers are in operation worldwide, owned by government transportation agencies and contractors alike.

 

Rutting, Cross-Slope & Texture

For advanced applications, SSI’s inertial profiling systems are scalable; more sensors can be added to support end user needs or agency requirements. Supported data outputs are rut depth, estimated cross-slope and pavement texture attributes. Rutting is available using up to 5 lasers, including a full-lane width transverse profile option (described below).

 

Full Lane Width Transverse Profile

SSI’s full lane width transverse profile measurement system has been designed pursuant to recent AASHTO provisional standards (PP067, PP068, PP069 and PP070). Using the latest infrared Gocator 2375 lasers the SSI program can collect transverse profiles of the pavement at a width of fourteen ft (4.27m). Each of the five Gocator sensors measures 1280 points. The complete transverse profiles can output detailed reports of such features as rut depth and lane-edge change at user prescribed intervals. The transverse system can be paired with longitudinal profiles to output IRI and localized roughness.

 

Road Geometry

Using an Inertial Measurement Unit (IMU) the running grade, cross slope, vehicle pitch and roll can be quantified. Through processing these data stream reports the SSI program can give road geometry at given points along the profiled surface.

 

The Evolution of GPS Accuracy

SSI’s basic GPS option includes 5 Hz GPS receiver embedded within the profiling system electronics. The GPS readings are added to the profile data so that localized roughness and user events can be re-located by GPS. The GPS readings can also be used to view overhead areas of the surface in Google Earth or Microsoft MapPoint. With the low resolution GPS systems the coordinates do not influence the elevation profiles. A medium resolution GPS option is available with 10-20Hz sampling and ~2.3 ft (.7 m) accuracy. The medium GPS option is ideal for real time navigation along the profile data to identify and address features on the pavement, such as must-grind bumps or areas of localized roughness.

 

Survey GPS

Combining the best of inertial profiler with the best of survey instrumentation, SSI offers a GeoProfiler capable of generating topography data at a 1 inch sampling interval. This system combines SSI profiling electronics, RTK GPS and cross-slope sensor to create a 3D surface. The data may be exported in traditional survey formats (e.g. PNEZD, PLLHD, GPGGA, CSV, TXT). With the survey subsystem, the SSI system becomes a roving GPS unit with RTK corrections communicated via a static base station or a group of networked base stations. The RTK system produces higher density topographies than the standard rod and level process—in a fraction of the time. The finished data can be imported into standard CAD programs for road design and machine control applications. For details on the mobile surveying systems, go to CS9350 High Speed GeoProfiler and CS8750 Lightweight GeoProfiler.

 

 

Proof of Performance

SSI’s inertial profiling systems have a proven ability to generate highly accurate, repeatable surface profile data. SSI guarantees compliance with industry standards and transportation agency equipment certification criteria. Under the various specifications, inertial profilers are commonly evaluated under four performance attributes:

  • Accuracy of Profile Measurements. Validating accuracy tests a profiler’s ability to measure the same pavement surface elevations as those generated by an independent device, such as a benchmark or walking profiler, rod and level, or other reputable survey instrument. In preparation for shipment, every SSI inertial profiling system must pass an accuracy verification on test tracks measured with both survey instrumentation and a walking profiler. 
  • Repeatability of Profile Measurements. A profiler is considered repeatable if it can take nearly identical repeat measurements on the same pavement test track. Time after time, SSI systems generate highly repeatable profiles on DOT certification pavement sites. 
  • Cross-Correlation of Profile Measurements. A further method of comparing same surface profile data is to compute a cross-correlation score rating the point-to-point agreement between multiple profiles. SSI’s systems have a proven ability to generate among the highest achievable correlation scores. 
  • Correct Ride Index Values. For widespread acceptance, an inertial profiler that is accurate and repeatable also must have the ability to generate the correct ride index and other statistics calculated based on the raw profile data. SSI’s inertial profilers consistently generate statistics that closely match those generated by walking or benchmark profiling devices.

    SSI’s inertial profilers have a unique fifth attribute that is unmatched in our industry.
  • Ability to Precisely Measure Features on the Surface. SSI’s inertial profilers can precisely measure the exact position and shape of fine features along a pavement surface. This has been proven by comparison of profiler measurements of an artificial bump of known dimensions. 

Each of these attributes is illustrated below for SSI’s inertial profiling systems.

 

Accuracy

To assess profiling system accuracy, a widely accepted method is to compare multiple data collections along the same surface with independent survey data from the same surface. Figure 1 shows an example of a point-by-point comparison of the profile data collected by an SSI speed system at a one-inch (25.4 mm) sampling interval as compared to an independent reference profile generated with survey instrumentation on a test surface. The SSI system’s data (the blue trace) overlays on the reference survey profile with high precision. On a running point-by-point comparison, the accumulated difference between the system’s profile and the survey profile is 22.5 mils (0.0225inches). This level of accuracy places the SSI system at the top among commercially available surface profiling systems.

 

Proof of Accuracy: SSI System vs. Survey Data

Figure 1: Proof of Accuracy: SSI System vs. Survey Data

 

Figure 2 depicts an accuracy comparison of ten repeat collections vs reference profile under Texas DOT’s certification requirements administered by The Texas Transportation Institute (“TTI”). All runs easily correlate to the reference profile well within the acceptable range.

 

Proof of Accuracy: SSI Profiler vs TTI Reference

Figure 2: Proof of Accuracy: SSI Profiler vs TTI Reference

 

Figure 3 is another example of the accuracy of SSI’s inertial profiling system, this time compared to a walking profiler reference device. Results are presented for pavement features in several wavebands of interest: IRI, long 25-125 ft (7.6-38.1 m ), and medium 5-25 ft (1.5-7.6 m). The ten runs with the SSI inertial profiling system correlates to the reference device at very high 96-98% scores.

 

Proof of Accuracy -- Waveband Comparison of SSI Profiler vs Walking Profiler

Figure 3: Proof of Accuracy -- Waveband Comparison of SSI Profiler vs Walking Profiler

 

Prior to shipping any high-speed profiling system, SSI’s verifies that each laser/accelerometer module on the system compares against a neutral reference profile with a greater degree of accuracy than is required by the most stringent agency equipment certification requirement. SSI routinely achieves accuracy comparison scores comfortably exceeding the 90% threshold recommended by ProVal’s Profiler Certification Module.

 

Repeatability

SSI’s high-speed profiling systems have a proven track record of generating highly repeatable profile data. Figure 4 is an example of repeatability comparison based on ten data collections along the same surface. This figure shows results from ProVal’s Profiler Certification Module—99% repeatability is achieved by the SSI inertial profiling system. SSI routinely achieves repeatability scores easily exceeding the 92% threshold recommended by AASHTO. This analysis is used in many DOT inertial profiler certification programs.

 

SSI Inertial Profiler: ProVal Repeatability Certification of Multiple Same Surface Collections

Figure 4: SSI Inertial Profiler: ProVal Repeatability Certification of Multiple Same Surface Collections

 

Figure 5 shows same surface repeatability of an SSI system with Gocator 2342 sensors on a dense grade asphalt surface. The repeatability exceeds 99% in both wheel paths. SSI guarantees that all models of its profiling system can produce highly repeatable profile data to surpass any industry specifications or equipment certification requirements.

 

SSI Dual Track Repeatability on 2015 MNRoad Asphalt Section

Figure 5: SSI Dual Track Repeatability on 2015 MNRoad Asphalt Section

 

Cross Corrilation

A cross-correlation analysis is increasingly used for rating the agreement between multiple same surface profiles from one or more devices. To produce a high cross-correlation score, the profiles being compared must contain the same level of roughness and rough features must appear in the same location and have the same shape within each profile.

Figure 6 shows the cross-correlation results from comparing repeat collections from an SSI profiling system instrumented with wide-footprint Roline lasers. The eight profiles were collected at the Minnesota Department of Transportation’s “MnRoad” Research Facility; specifically Cell 8 (conventional diamond grind) of the Mainline surface. The conventional grind finish is considered challenging, as it has longitudinal grooves and skewed joints with protruding sealant. The Cell 8 pavement consisted of a 500 ft (152.4 m) test section.

 

SSI Inertial Profiling System:  Proof of High Cross-Correlation Scores

Figure 6: SSI Inertial Profiling System: Proof of High Cross-Correlation Scores

 

Figure 7 shows another example of high cross-correlation scores. The figure displays an overlay of ten separately collected runs and the cross-correlation score between run #4 and the other nine runs.

 

Proof of High Cross-Correlation Scores

Figure 7: Proof of High Cross-Correlation Scores

 

Ride Index Values

Figure 8 depicts results from a 2015 TxDOT certification. The values generated by SSI’s inertial profiling system are well within the acceptable tolerance.

Proof of Accurate Ride Index Values

Figure 8: Proof of Accurate Ride Index Values

 

Figure 9 shows SSI’s results at MnRoad’s 2015 Inertial Profiler Evaluation. SSI’s profiler produces accurate ride values on any pavement type.

 

IRI Deviation vs Reference Profiler at MnRoad Facility

Figure 9: IRI Deviation vs Reference Profiler at MnRoad Facility

 

Measuring Fine Features on the Surface

SSI’s profiling systems have the proven ability to reproduce the exact profile of the tested surface with a greater degree of accuracy then any competitive system. Figure 10 shows the SSI system’s ability to reproduce the exact dimensions of an artificially constructed bump placed at a random location on the test surface. The dark blue line shows the artificial bump (10 feet long with seven 0.25 inch steps up and then seven 0.25” steps down) placed from station numbers 292 to 392 on the test surface. Three collections from an SSI high-speed profiling system run over the bump are overlaid on top of the trace of the actual simulated bump. The high-speed profiler data reproduces the actual bump dimensions with exacting precision. As shown in Figures 11 and 12, competing profilers tested over the same bump distort the features of the localized roughness by either missing its dimensions on the second half (Figure 11) or showing the bump as a numbed bell curve due to excessive data filtering (Figure 12). Unlike less capable profiling systems, all models of SSI’s profilers can reproduce the fine features on the surface with unmatched precision and accuracy. 

 

SSI Profiling Systems Accuracy in Reproducing Fine Features (Such as Localized Roughness)

Figure 10: SSI Profiling Systems Accuracy in Reproducing Fine Features (Such as Localized Roughness)

 

In Figure 11 below, three repeat collections from a competing profiler are overlaid on top of the artificial bump. This system loses the ability to preserve the features of the bump shortly after reaching the peak amplitude.

 

Distorted Pavement Feature Detection by Non-SSI Inertial Profiling System

Figure 11: Distorted Pavement Feature Detection by Non-SSI Inertial Profiling System

 

Figure 12 below depicts the three repeat collections from another competing profiling system. The bump is depicted with a bell curve shape with no preservation of the finer features or actual shape of the event, which is a likely result of unrefined excessive filtering methods used to process the raw profile data.

 

Imprecise Pavement Feature Detection by Non-SSI Inertial Profiling System Using Excessive Filtering

Figure 12: Imprecise Pavement Feature Detection by Non-SSI Inertial Profiling System Using Excessive Filtering

 

 

Specifications

  • Measurement Principle: Inertial profiling system (with laser and accelerometer-established inertial reference and high resolution optical encoder sensor (ASTM E950 “Standard Test Method for Measuring the Longitudinal Profile of Traveled Surfaces with an Accelerometer Established Inertial Profiling Reference”). 
  • Device Rating: Meets or exceeds Class I requirements of ASTM Standard E950. Complies with applicable DOT and other industry standards, including AASHTO M328, R054, R056 and R057.
  • Data Sampling Interval: Variable sampling interval with default set to 25 mm (1.0 inch). One inch (25 mm) sampling interval valid for all collection speeds. User configurable sampling interval to >1.0 inch (e.g. 6 inches).
  • Distance Measurement: Optical encoder based distance measurement system with longitudinal distance accurate to 0.1% or greater. 
  • Height Measurement: Vertical measurements acquired with one or multiple non-contact laser range finder sensors unaffected by pavement texture, color, reflectivity or ambient lighting. Single point (spot) lasers or wide footprint lasers (e.g. LMI Technologies RoLine and newer Gocator sensors). Laser sensor sampling frequency: minimum 32KHz (32,000 samples/second) for spot lasers. Increased sampling interval sensors available (e.g. optional 64kHz). Laser vertical measurement accuracy: 0.00005 inches typical with 0.0005 resolution. 
  • Laser Classification & Safety Admonition: The laser sensors on SSI inertial profiling systems utilize light sources that are semiconductor lasers emitting visible light. The lasers have a 3B/lllb classification under the standards relating to laser products specified in IEC 60825-1 and U.S. FDA CFR Title 21 Part 1040 and Laser Notice No. 50, dated July 26, 2001. Class 3B/lllb components are UNSAFE for eye exposure. Usually only ocular protection would be required. Diffuse reflections are safe if viewed for less than 10 seconds. WARNING: DO NOT look directly into the laser beam. It is recommended that wearing laser safety goggles (for Class 3B/IIIb lasers) be worn if a user of the profiling system is in the vicinity of the profiling system hardware when the lasers are operational.
  • Vertical Acceleration: Host vehicle suspension dynamic measured with aerospace grade accelerometer sensors (rated for up to +/- 5g or 10g; resolution accuracy: 0.0001g). 
  • Profile Feature and Wavelength Preservation: Proven ability to measure and preserve fine surface features more accurately than any competing system. Profile wavelength preservation with standard SSI profiling system from ~0.25 feet (76.2 mm) to in excess of ~760 feet (231.6 meters). With optional survey subsystem added to SSI profiling system, long wavelengths preservation is thousands of feet (meters)(theoretically infinite). 
  • Repeatability & Accuracy: Guaranteed to meet or exceed industry standards and specifications (including ASTM E950, AASHTO M328, R056, and DOT including Texas 1001-S).
  • Specification Compliance: Complies with all commonly used agency specifications and test methods for use of inertial profiling systems for ride quality testing applications.

 

Profiling System Electronics and Computer Hardware

  • Profiling System Core Electronics Module: Custom profiling system core electronics module fabricated in ISO 9001 compliant facility. Single module connects to all profiling system sensors with dedicated micro-processors for each sensor. Profiling system core electronics is portable, modular, and sized for express shipment worldwide for prompt in-field replacement. 
  • Profiling System Sensors: Industrial / aerospace grade sensors. System supplied with durable shielded cables with Amphenol connectors.
  • Operator Interface Computer: Mil-Spec tested Panasonic Toughbook 19/31 ruggedized notebook computer (typical CF-31 configuration: Intel i3/i5 processor, Microsoft Windows XP Professional or Windows 7 operating system, minimum 2GB RAM (expandable to 4-8 GB); minimum 160-320GB hard drive, optional DVD multi-drive, Gigabit Ethernet LAN, wireless 802.11 a/b/g/n, 13.3” SVGA display with outdoor readable touch screen; under 8 lbs; lithium-ion internal battery. Additional options and accessories available for Toughbook computer.
  • In-Vehicle Workstation: Pedestal mount system and docking station for operator interface computer and power supply. Alternate suitcase enclosure supplied with internal power supply can communications cabling for connection between profiling system instrumentation and operator interface computer.

 

Profiling System Mount Attachment

  • Mount Hardware: Professionally engineered mount hardware for attachment of inertial profiling system components onto front or rear of industry standard vehicles. Portable systems attach to standard 2 inch (5.08cm) square receiver tube and operate from host vehicle’s 12V power supply.
  • Flexible DMI Hardware: Hardware supplied for attachment of high resolution distance measurement interface to rear wheel of host vehicle. Dedicated lug-extenders or optional collets supplied.
  • Sensor Adjustment: Dove-tail hardware supplied for horizontal and vertical adjustment of laser / accelerometer sensor modules.
  • Adaptor Hardware: Custom hardware design and fabrication available for profiling system attachment according to customer defined requirements or specifications (front, rear, or mid-vehicle mount).

 

Profiling System Software

  • SSI Profiler Software Suite: SSI internally developed software routines for profiling system calibration, data collection, data analysis and reporting. On-screen instructions for system calibration and data collection. Feature rich data analysis software. Current versions built on over 20 years of continuous development.
  • Profiling Programs Fully Compatible With Microsoft Windows: All software fully integrated with Microsoft Windows 7/8 Professional),
  • Multiple Calibration / Diagnostic Routines: Menu driven calibration routines for distance, proprietary accelerometer static calibration (in-field), bounce test (data file saved), laser height verification (0.25”/0.5”/1.00”/2.00”), rut-depth (if equipped) and cross-slope (if equipped). Internal diagnostics provide real-time monitoring of profiling system health. 
  • User-Selectable Parameters: English or Metric units for both data acquisition and reporting; new file parameters become default (no recurring new file setup). Industry standard and user definable parameters to facilitate identification, authentication and sharing of profile data. 
  • Real Time Display: Real time display of vehicle position and surface profile trace during data collection.
  • Multiple Data Collection Triggers: 3 data collection triggers: (i) SSI Reverse Direction Trigger (proprietary procedure that collects exact stations without pre-marking test sections and post-testing cone removal), (ii) Electric Eye, and (iii) On-the-Fly.
  • Event Marking: Entry of location notes by (i) push button or electric eye, with text editing by operator after safe finish of data collection, or (ii) user configurable hot keys (assigning unique event types to particular keyboard buttons).
  • Urban Area Data Collection: SSI “Continuous Collection” software suspends collection system when speed traffic signals and resumes collection upon system exceeding 5 mph forward speed.
  • Pause Function with Data Retained: Pause data collection manually or with electric eye. Data from paused sections retained for reporting separately or combined with non-paused areas.
  • Multiple Profile Indexes: Profile data reported in multiple indexes Profile Ride Index (PRI), International Roughness Index (IRI)(by segment or continuous), Mean IRI (MRI), Half Car Ride Index (HRI), Ride Quality Index (RQI), and Ride Number (RN).
  • Localized Roughness: Multiple outputs of localized roughness supported. Rolling straightedge, profilograph must grind bump/dip template, Texas 1001-S localized roughness, IRI areas of localized roughness reported according to user specified IRI thresholds. Dimensions of localized roughness calculated by length of defect and peak amplitude. 
  • Re-Writeable Data with Variable Data Analysis Parameters: Raw profile data infinitely rewritable for outputting reports and profile traces under user adjustable parameters.
  • Variable Filtering: Raw inertial profile data can be filtered with low pass filters (0.5 ft to 1.0 ft.) and standard high pass filters 100/200/300 ft, with scalable custom filter lengths of up to 800 feet or more for custom applications.
  • Multiple Trace Reporting: Patented multiple profile trace data acquisition and reporting capability. Single sensor systems report dual tracks (separately collected in either direction).
  • Data Conversion Sub-Routines Supplied: Exportroutines for conversion of profile data to industry specified formats (ERD, PPF, PRO, ASCII, CSV, Excel, Text, raw profile/ProScan, GIS and customized per request). 
  • One Touch PDF Images: Create universally readable PDF images of profile traces and reports directly within SSI Profiler program.
  • Multiple Software Licenses: Data analysis software licenses provided for profiling system and desktop computer usage.
  • Data Encryption: Encrypted raw data files for data integrity security, raw data by repeat analysis under adjusted parameters.

 

Operational & Physical Attributes

  • One Person Operation: “All-in-Cab” data collection, analysis and reporting system (profiling system data collection and analysis functions can be performed by one person without leaving the cab of the vehicle).
  • Speed Range: Forward speed: Minimum: 5 mph (8 kph); Maximum: 70 mph (112 kph) for Class I data (true 1” / 25 mm sampling interval).
  • Temperature: Operating ambient temperature range: 32° to 110° F (0 -51.6°C); non-laser component operating temperature range: 0 to 140 F (18-60°C).
  • Humidity: Operating humidity should not exceed 90 percent (noncondensing); non-operating humidity range shall not exceed 100 percent (noncondensing).
  • Moisture: Profiling system components impervious to moisture. Quality of measured profile degrades with excessive moisture (active rainfall, standing water or ponding on surface.
  • Dimensions:
    • CS8700 Lightweight Profiler: Click to see Polaris Ranger 570-EFI vehicle specifications.
    • CS9100 Mid-Mount Profiler: Sensor modules: 10.5”L x 5.5”W x 3.75”H (cm: 26.7Lx14Wx9.5H)
      • Control module: 12”Lx12”Wx5H” (cm: 30.5Lx30.5Wx12.7H).
    • CS9200 Trailer Profiler: 10’Lx6.5’Wx3’H (cm: 152Lx20.3Wx61H).
    • CS9300 Portable Profiler: 60”Lx8”Wx24”H (cm: 152Lx20.3Wx61H).
    • CS9400 Simple Profiler: 24”Lx8”Wx24”H (cm: 61Lx20.3Wx61H) 
  • Weight:
    • CS8700 Lightweight Profiler: ~1100lbs (500kg); <10 PSI impact on pavement.
    • CS9100 Mid-Mount Profiler: 30 lbs (13.6 kg) or less.
    • CS9200 Trailer Profiler: 400-450lbs (180-205 kg); <10 PSI impact on pavement.
    • CS9300 Portable Profiler: ~75 lbs (34 kg).
    • CS9400 Simple Profiler: ~40 lbs (16 kg).
  • Electrical Rating: 
    • Input: 5-14 volts DC.
    • Operating: ~3 amps.

 

Support

  • Operator Training: Worldwide multi-lingual on-site operator training available. 
  • Real Time Diagnostics: Profiling system health monitored by real-time diagnostics to verify integrity of main profiling system electronics, all sensors, and data communication interface. Visual and audible feedback.
  • Software Updates: Self-executing program updates overwrite prior versions. Supplied by internet download. 
  • In-Field Component Replacement: All collection system components portable, modular for in-field replacement.
  • Warranty: Industry standard one year warranty on all profiling system components and accessories. Extended warranty options available.
  • Customer Support Representatives: Customer assistance available worldwide by telephonic, e-mail and on-site assistance (24x7 support available as requested or needed).

 

Options & Accessories

  • GPS: Coordinates from GPS subsystem correlated with profiling system station (chainage) data, Google Earth overhead imagery and Microsoft MapPoint navigation program. Standard GPS at 5Hz. Medium option GPS at 10-20Hz with 2.3ft/.7m accuracy; real time navigation supported.
  • Specialty Lasers: Line scan sensors available for improved testing on concrete and grinding pavements. Higher speed lasers available for texture measurement.
  • No Lasers: CS9450 Simple Roughness Meter available with axle mounted accelerometer based profile measurement; ideal for IRI/RMS assessment on unpaved roads, trails or surfaces with extreme roughness.
  • Survey Resolution GPS: Mobile surveying subsystem available with RTK corrected GPS data merged with profile data for high resolution topography mapping. Up to three simultaneous longitudinal profiles with cross-slope and corrected GPS supported. Data outputs in typical survey format (e.g. PNEZD, GPGGA, etc.) for surface design in civil engineering applications and machine control applications.
  • Rut Depth: Several configurations available for measuring rut depth: 3 point (South Dakota method), 5 point (AASHTO PP 38), or full lane width transverse profile.
  • Transverse Profile: Full lane width transverse profile across 14 feet (4.27 meters) using 5 ultra wide-beam 1280 point lasers. Developed pursuant to AASHTO provisional standards (PP067, PP068, PP069 and PP070).
  • Geometry: Road geometry measurements distilled from an optional tactical grade Inertial Measurement Unit (IMU).
  • Camera: Dashboard mounted digital camera for roadside images merged with profile data at user specified intervals.
  • Multi-System Integration: Support for profiling system integration with other sub-systems (imaging, asset inventory, surface distress, rut depth measurement, GPS/GIS, etc.) available. UDP or other compatible system interface support provided for integration of profiling system with other data collection and reporting systems. 
  • Printer: Optional on-board custom thermal printer (4" paper width; continuous feed; wider paper widths available). Windows compatible printer. AC power source for office use available.

 

Patented Technology

SSI profiling systems include technology within the scope of patents granted by (or filed with) the U.S. Patent and Trademark Office. Contact SSI for further patent or other technical information. 

 

1. International Standard IEC 60825-1 (2001-08) Consolidated edition, Safety of laser products – Part 1: Equipment classification, requirements and user’s guide.

2. Technical Report TR 60825-10, safety of laser products – Part 10. Application guidelines and explanatory notes to IEC 60825-1.

3. Laser Notice No. 50, FDA and CDRH http://www.fda.gov/cdrh/rad-health.html

 

Options

 

GPS Solutions

Better to Best GPS: Choose from medium [2.3ft/0.7m (or 4”/10cm with subscription)] or high resolution RTK corrected (0.4 - 0.8”/1-2 cm) with CAD output formats.

 

Cameras

Low Resolution Camera
Collect profile data and Right of Way (ROW) images with a dash mounted USB camera that is 1.3 megapixels. The images are tagged with GPS, stationing and ride values. All images can be viewed inside SSI Profiler along with all pertinent information about the image location. At this camera resolution prominent features can be distinguished such as signs and changes in pavement texture.  

High Resolution Camera
Upgrade to a high resolution camera to collect profile images at 4.3 megapixels. This higher quality camera collects more frames per second, utilizing a USB3.0 interface. With higher frames per second and a larger image sensor this camera option eliminates blurred pictures and can be used in lower light conditions with a high aperture lens. The images will appear in SSI Profiler after being saved to the operating Toughbook hard drive in JPEG format. With the high resolution camera the user can read street signs and view pavement distresses through the windshield.

Rear Distress Camera
Capture full lane width images at highway speeds to classify distresses. The images are captured at a resolution of 3.5 to 4 megapixels depending on the image scaling desired. The rear down facing camera will collect a continuous image stream that can be used to determine pavement distresses.

 

Rut Depth

Rut depth is calculated from a fourteen foot transverse profile. The transverse profile can be collected down to four inch (101.2 mm) intervals. The rutting depths is calculated based on the elevation characteristics of the profile. The profile is split into two halves where each rut is identified. Simpler, lower cost, but less resolute rut measurement is available using 3 lasers (the “South Dakota method”) or 5 lasers (AASHTO Standard R48-10 method).

 

Transverse Profile

The transverse profile is collected using cross-slope and infrared lasers to complete a fourteen foot profile. This profile can be collected every 4 inches (101.2mm) to show rutting, lane drop off along with curb and gutter. SSI’s software builds the profile and identifies station, GPS coordinate, rut depth and segment properties such as IRI, MRI and localized roughness statistics.

 

Surface Geometry & Topography

Use the on-board gyroscopic IMU and GPS to determine radius of curvature, running grade and cross slope. Correction factors and measured offsets give an accurate cross slope independent of the host vehicle’s roll, pitch or tilt. These correction factors improve the reliability of measuring super elevated curves.

 

Texture

Collect Mean Profile Depth (MPD) and texture readings at highway speed using a high frequency laser. Collect bursts of macro elevation data to determine MPD from a macrotexture profile. The MPD can be reported at a user defined sampling interval. 

 

 

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Inertial Profiling Systems

 

With a refined combination of custom hardware, ISO-9001 built electronics and feature-rich software, SSI’s inertial profiling systems have more features, are easier to operate, and perform better than other systems. Beyond guaranteed compliance with industry specifications for ride quality testing, SSI’s devices have the proven ability to measure the actual surface characteristics of concrete or asphalt pavements with unmatched precision. The precision is a difference that elevates the SSI system over the competition—SSI profilers are not just an ordinary tool to replace the profilograph, test IRI, or guesstimate areas of bumps or dips. SSI has advanced the science, and the art, of surface measurement with lower noise data collection instrumentation and optimal filtering methods that result in a truer measured profile of the surface as compared to competing devices. SSI’s systems have an unrivaled ability to reconstruct finer features and output exact dimensions of localized roughness. Many more differences from ordinary profilers exist within SSI’s hardware and software. 

 

Variety

SSI offers a variety of unique configurations of inertial profiling devices. Choose between five models: (1) the popular CS9100 Mid-Mount Profiler, (2) the CS8700 Lightweight Profiler, (3) the cost effective CS9400 Simple Profiler, (4) the versatile CS9300 Portable Profiler, or (5) the custom trailer-mounted CS9200 Multiple Purpose Profiler. For use under typical QA/QC applications, SSI offers single, dual or three laser inertial profiling systems. SSI’s single laser profilers can output dual wheel path reports, with SSI’s patented alignment of separate data collections into a single report (with the results summarized and averaged). The dual and three track systems collect multiple tracks of surface data simultaneously. All of SSI’s inertial profilers are high capacity, durable tools that can be used throughout all project phases – from assessment of original surface ride quality prior to bidding – to tracking surface conditions during construction – to monitoring smoothness throughout the life cycle of mature pavements.

 

Professionally Engineered Designs

All of the inertial profilers offered by SSI feature our custom built hardware and electronics paired with LMI Gocator lasers and other industrial grade sensors. All hardware is professionally engineered. SSI’s electronics are designed by PhD engineers and built by ISO-9001 certified manufacturers. Our software programs evolve from a structured engineering process that includes end user input as an important element; precision is by design, not by luck or accident. With the modular design of SSI’s equipment, we provide the ability to transfer the core components and functionality from one vehicle to another quickly and easily.