Opto-electronic sensor device i.e. light barrier, has polarization filter arranged between transmitter and transmitter optics that is designed as thin Fresnel lens, and analyzer arranged between receiver and receiver optics

摘要

The device has a transmitter (1) for transmitting electromagnetic radiation, and a receiver (4) for receiving the radiation. A polarization filter (2) is attached to the transmitter for polarizing the radiation. An analyzer (5) is provided for analyzing the polarized radiation. A transmitter optics (3) and a receiver optics (6) are formed by a diffraction grating or by a Fresnel lens. The filter is arranged between the transmitter and the transmitter optics. The analyzer is arranged between the receiver and the receiver optics. The transmitter optics is designed as a thin Fresnel lens.