Device to detect spacing variation between two sides of body especially vehicle chassis has Doppler sensor to transmit millimeter waves to one side and spaced reflector to reflect waves to other side

摘要

The device has a Doppler sensor (6) to transmit millimeter wave signals to one of the sides (4B) and a spaced reflector (8) to reflect the millimeter wave signals to the other side (4A). An evaluation unit (10) produces a deformation signal of the deformation according to the number of zero passes of the millimeter wave signal. Preferably, the evaluation unit has a thresholding circuit to determine the zero passes of the millimeter wave signal.