Monitoring light barrier has receiver group of individually evaluatable receiver elements, optical system of several lenses or hollow mirrors enclosed on both sides by two transmitter groups

摘要

The device has an arrangement of light transmitters (visible or infrared) and light receivers with increased sensitivity and achieves increased sensitivity and positive identification when monitoring openings. A receiver group consists of individually evaluatable receiver elements and an associated optical system of several lenses or hollow mirrors enclosed on both sides by 2 transmitter groups.