How does a falling weight Deflectometer work?

The Falling Weight Deflectometer is a device that is used to evaluate pavement and pavement layer stiffness. It is a trailer-mounted device that operates by dropping a weight on to the pavement and measuring the resulting pavement deflections.

What is a heavy weight Deflectometer?

The Dynatest Heavy Weight Deflectometer (HWD) is designed to impart a load pulse to the pavement surface, simulating the load produced by an aircraft. Deflection sensors, mounted around the load plate measure the deformation of the pavement in response to the load.