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WIM systems can employ various types of sensors for measurement. The earliest WIM systems, still used in a minority of installations, use an instrumented existing bridge as the weighing platform. [38] [39] Bending plates span a void cut into the pavement and use the flexure as the wheel passes over as a measure of weight. Load cells use strain ...
Electronic scales with PSI sensors measure air pressure in a vehicle's air suspension. [11] The scale relays this data to a receiver hardwired into the cab, [13] or wirelessly to a handheld unit such as a smart phone, either of which will interpret the data and display axle weight(s) and/or gross vehicle weight. Data may be further transmitted ...
A Fast Falling Weight Deflectometer (FFWD) is a FWD with pneumatic or electric actuators rather than hydraulic, making the mechanics several times faster. A Heavy Weight Deflectometer (HWD) is a falling weight deflectometer that has higher loads (typically 300 kN to 600 kN), used primarily for testing airport pavements.
There are weight detecting devices in the roadway itself. A driver may get a red light. On these occasions, the truck must pull into the weigh station for the normal weigh-in procedure. The most common reason a truck is "redlighted" is a weight problem, or a random check.
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A strain gauge sensor measures the deformation of the elastic element, and the output of the sensor is converted by an electronic circuit to a signal that represents the load. Capacitive strain gauges measure the deformation of the elastic material using the change in capacitance of two plates as the plates move closer to each other.
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