SSI’s CS8800 Walking Profiler is a manually propelled surface profiling instrument capable of generating high resolution data (at a 1 inch/25 mm sampling interval) and expressing numerous ride quality statistics (IRI, HRI, PRI, RN, etc.) as well as precise detection of areas of localized roughness.  An Overview of the CS8800 systems is below, along with details about the Hardware Features, Software Features, Technical Specifications, Operator Interface Computer, and Proof of Performance. Pictures of the system can also be viewed, and several informational downloads are available.  Contact SSI for pricing and lead time.  A Product Update for the CS8800 is also below.

UPDATE (October 2008):  The newly refined SSI CS8800 Walking Profiler system has passed the stringent 98% correlation threshold for ten repeat data collections on the same test surface as specified under United States Federal Highway Administration (“FHWA”) Contract DTFH61-07-R-00110 [(TPF 5(063) Pooled Fund Study “Improving the Quality of Pavement Profile Measurement,” Priority Number One: Reference Device)].  By passing this test, the CS8800 has elevated itself above other commercially available walking profiler devices in its ability to reproduce an identical profile on the test surface with extreme precision time after time. To view the CS8800’s results under the FHWA testing for high precision and accuracy, Click Here. When evaluating walking profiler devices, SSI strongly encourages an evaluation of whether any other device under consideration can match similarly stringent criteria for repeatability and accuracy to the test results achieved by the CS8800. 

OVERVIEW

SSI’s CS8800 Walking Profiler is a walking speed surface profiling instrument capable of generating numerous ride quality statistics and precise depictions of localized roughness. Distilled from SSI’s profilograph and inertial profiling system technology, the CS8800 records the surface profile by measuring precise movements of distance and elevation changes that are processed with SSI’s proprietary data collection electronics and advanced digital filtering methods. The system generates commonly used ride indices such as IRI, HRI, RN, PRI, Floor Flatness/Floor Levelness, and other commonly used expressions of surface quality. Localized roughness is also precisely captured both in its longitudinal location and height and depth dimensions. Powered by a military specification Panasonic Toughbook 19 Touch-Screen computer (Windows XP/Vista operating system), the CS8800 pairs cutting edge electronic technology with SSI’s feature rich profiling application software. Raw data exports to commonly used formats, including ERD, PPF, PRO, ASCII, Excel and PPF. The CS8800 collapses into a portable container that can be easily transported or shipped.  Available options include integrated GPS, (low resolution or survey quality) and three-dimensional texture measurement with a lateral line scan laser (LMI Technologies “Selcom” RoLine sensor or equivalent).

Return to Top

Pictures:  (click to enlarge)

 HARDWARE FEATURES

Return to Top

SOFTWARE FEATURES

Return to Top

TECHNICAL SPECIFICATIONS*

Device Classification/Rating

World Bank Class 1 Instrument.  ASTME950 Class 1 Equivalent Device.

* Specifications based on prototype development objectives and are subject to change without notice.

Return to Top

OPERATOR INTERFACE COMPUTER

Return to Top

PROOF OF PERFORMANCE

The SSI CS8800 Walking Profiler system has the proven ability to generate highly accurate and closely repeatable surface profile data. These attributes are evidenced by the Figures below.  Figure 1 shows a comparison of the data from SSI’s CS8800 system as compared against independent survey data. Figure 2 shows a repeatability comparison of ten repeat same surface data collections by the CS8800.  For a downloadable Proof of Performance document for the CS8800, Click Here. 

Figure 1:  Proof of Accuracy.  In Figure 1, the surface data collected by the SSI CS8800 Walking Profiler is compared to independent survey data on the test surface.  Figure 1 shows a point-by-point comparison of ten repeat data collections by the CS8800 system at a one-inch (25 mm) sampling interval as compared to an independent reference profile generated with survey instrumentation.  The CS8800 system’s data (the blue trace) overlays on the reference survey profile with exact precision.  On a running point-by-point comparison, the accumulated difference between the CS8800 system’s profile and the survey profile is 23.8 mils (0.0238 inches).  This proof of accuracy is unmatched in the industry and demonstrates that the CS8800 is the most accurate commercially available walking profiler system.  Prior to delivering any CS8800 profiling system to an end user, SSI’s verifies that the collection system compares against an independent reference profile with a greater degree of accuracy than is required by any agency specification or equipment certification requirement.

Figure 1:▲SSI CS8800 Profiling System:  Proof of Accuracy vs. Survey Dat

Figure 2:  Proof of Repeatability:  SSI’s CS8800 Walking Profiler system is proven to also generate highly repeatable profile data.  The graph below shows ten repeat data collection runs with the CS8800 lightweight profiling system on the same test surface.  Figure 2 shows the near identical comparison of the ten separately collected profile traces from the SSI CS8800 system.  A cross-correlation statistical comparison of the ten runs shown in Figure 2 produces a 98% point-by-point repeatability result, as calculated by independent engineering software.  It should be noted that repeatability scores are influenced by variables such as device tracking, operating speed and the magnitude of roughness and texture on the test surface.   The repeat data runs in Figure 2 are shown using SSI’s Trace Viewer software tool, which allows a comparison of same surface runs by overlaying multiple profiles over one another.  The proven repeatability of the CS8800 surpasses that of any other commercially available walking profiler system. 

Figure 2:  CS8800 Proof of Repeatability:  Overlay of Ten Profile Traces from Same Surface

Return to Top