| 摘要 |
PCT No. PCT/DE93/01245 Sec. 371 Date Jul. 13, 1995 Sec. 102(e) Date Jul. 13, 1995 PCT Filed Dec. 28, 1993 PCT Pub. No. WO94/15819 PCT Pub. Date Jul. 21, 1994A sensor device for detecting the degree of wetting and/or contamination of windows, especially windshields of motor vehicles, which device has a radiation source (12) emitting a radiation into the window (10) from the inside of the window (10), and a radiation measuring device detecting the radiation reflected many times by total reflection in the window (10) between outer surface (17) and inner surface (18). A heating device (33) is arranged on at least one contact surface between the sensor device and the window (10) or in the window. As a result, the measurement path (19) of the window (10) is deliberately heated with a low energy requirement, so that no measurement impairment is to be feared as a result of condensation on the inner surface (18) of the window and a mirrored reflection surface on this inside is not necessary. |
