Sensor for measuring dampness on the outer side of a motor vehicle window pane has an inner coil to connect to a DC/AC current converter's output for AC voltage and a control device for evaluating test data and regulating a screen washer.

摘要

Inner (2) and outer (3) coils are fitted on a motor vehicle windscreen (1). The inner coil connects to a current converter's (4) output turning DC (5) to AC voltage. During impulse-voltage intervals test data is fed through a demodulator (6) to a control device (7) for evaluating the test data and regulating the screen washer.