Infrared dual-beam distance setting inductor and inductive method of the same

Abstract

The invention discloses an infrared dual-beam distance setting sensor and a sensing method thereof. The sensor includes a single-chip microcomputer, two sets of symmetrically arranged transmitting tubes and receiving tubes, the transmitting tubes and the receiving tubes are all on the same straight line, and the two transmitting tubes Located inside the two receiving tubes, the transmitting tube is connected to the single-chip microcomputer by the transmitting controller, and the receiving tube is connected to the single-chip microcomputer by the receiving circuit; the vertical distance from the transmitting tube to the measured object, that is, the sensing distance is H, and the width of the measured object is preset. , The distance between the two transmitting tubes is A1A2 and the distance between the two receiving tubes is B1B2, so as to determine the angle R between the two transmitting tubes and the inclination angle β of the receiving direction of the receiving tubes. The invention adopts reverse thinking, does not need a large amount of analysis and processing of the infrared signals emitted and received, and is not affected by the color and surface roughness of the measured object, and has low product cost, high reliability and strong anti-interference ability.

Description

technical field [0001] The invention relates to an infrared sensor, in particular to an infrared double-beam fixed-distance sensor and a sensing method thereof. Background technique [0002] Infrared sensors can be used in places that require precise positioning of the human body, such as: sensor sanitary ware, ATM machines, automatic doorbells, anti-theft alarms, etc. At present, the infrared sensors used in the above places generally adopt active infrared induction methods or position sensitive detection devices. The processing process is that the infrared emitter emits infrared rays of a certain wavelength, and after being reflected by the human body, the infrared receiver is used to judge the reflected signal strength or Calculate the sensing distance to realize automatic sensing judgment. The problem with this type of infrared sensor is that it responds differently to objects of different colors and different roughnesses. White, smooth-surfaced objects have a strong re...

AI Technical Summary

Problems solved by technology

The problem with this type of infrared sensor is that it responds differently to objects of different colors and different roughnesses. White, smooth-surfaced objects have a strong reflection of infrared light, showing a long sensing distance; black, surface-existing Diffuse reflection objects have weak reflection of infrared light, which is manifested as a short sensing distance or even no sensing, thus affecting the normal use of the product

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