Liquid drop detection device for vehicle disc, has electromagnetic radiation source to emit radiation in infrared wavelength range, and prism placed in radiation path between source and disc to deflect radiation on disc

摘要

The device has an electromagnetic radiation source (1) to emit an electromagnetic radiation in an infrared wavelength range. An image acquisition device (7) absorbs the radiation reflected by an exterior of a vehicle disc (4), where maximum spectral sensitivity of the device lies in the range. A prism (3) is placed in the radiation path between the source and disc to deflect the radiation outgoing from the source on the disk.