A SENSING DEVICE FOR ACCESS GATE

摘要

A sensing device for a detection region designation type passing car for an access gate according to the present invention includes a light emitting part which emits an infrared ray with mixed specific frequencies, a receiving part which is adjacent to the light emitting part and receives an infrared ray emitted from the light emitting part, a casing which is adjacent to the light emitting part and the receiving part and surrounds them, a CPU which determines whether an infrared ray received from the receiving part is equal to a frequency emitted from the light emitting part, and an oscillation part which is connected to the CPU and oscillates a specific frequency. It is installed to the access gate of a building such as a subway or a railroad. It detects a passing car with a specific frequency mixed with the frequency of an infrared ray without the effect of scattered light in monitoring the passing car. An error for the passing car is not generated. The tilt angle of the light emitting part is controlled so that a detection distance can be controlled. Convenience in use can be improved.