Acoustic Imaging And I-95 Testing

The SAS-1 utilizes SmarTek Systems’ advanced signal and spatial processing technology to provide a high resolution "acoustic image" of all vehicle traffic passing by the sensor (including shoulder activity). This advanced processing eliminates false vehicle detections caused by out of lane or off road noise. As a result, the end user is provided with significant flexibility to electronically position each detection zone and set each detection zone’s size. This capability eliminates the necessity of precise mechanical "pointing" of the sensor to a detection zone position during installation. Instead, electronic detection zone positioning is accomplished using SmarTek System's provided Windows based software. The easy to use "SAS Monitor and Setup" software displays the position ("acoustic image") of every vehicle in real time as the vehicle passes the sensor station. Using this display and associated controls, the end user adjusts each detection zone position and size in the cross road direction. This easy process in effect electronically sets each highway lane position relative to the mechanical sensor orientation after the sensor has been permanently "locked down".

For a complete explanation of how acoustic imaging is accomplished in the SAS-1and how well the SAS-1 works, please download "High Performance Multi-lane Highway Monitoring Using SAS-1 to Acoustically Image the Highway".  Don't let that catchy title fool you!  The document contains illustrations of how the sensor does its job, how it is employed, several "snapshots" of traffic captured during rush hour on I-95 south of Washington, DC and some longer term comparisons to manual counts conducted in May 1998.  You will need Adobe Acrobat reader to read this document. 

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