Cross-type light screen detection device based on FPGA

Abstract

The invention discloses a cross-type light curtain detection device based on an FPGA. Light receiving tubes are each connected with analog comparators with operational amplifiers, and the analog comparators with the operational amplifiers are each connected with the FPGA. Each light receiving tube receives the light pulses emitted by all the infrared transmitting tubes, and the analog comparatorswith the operational amplifiers are used for simultaneously realizing the amplification of a weak electric signal and the digitization of an analog signal. The FPGA is used for simultaneous receivingand parallel processing of multi-channel signals, thereby achieving the in-place detection of a miniature moving object. The infrared transmitting tubes employ the two-stage control of MOS tubes and distance triodes, and the driving circuits of the infrared transmitting tubes employ the distance triodes to switch the power resistance. The device is characterized in that the device is high in detection precision, is high in data processing speed, is strong in anti-interference ability, is convenient to upgrade, can be used for various industrial harsh environments, is particularly suitable fora silicon steel sheet production line of the metallurgical industry, and can realize the in-place detection of a small high-speed moving object with a thickness of less than 1 mm.

Description

technical field [0001] The invention relates to a cross-type light curtain system for in-position detection of tiny moving objects, which belongs to the field of optical computing equipment. Background technique [0002] The light curtain is a synchronous opposite-beam detection device with a row of infrared emitting tubes and light receiving tubes installed from top to bottom. The ordinary light curtain is composed of a transmitter and a receiver. The transmitter drives an infrared emitting tube to emit a beam of infrared rays at a certain interval along the length direction to generate AC infrared light pulses. The receiver arranges the same number of light receiving tubes according to the same spacing. [0003] In the actual working environment of the light curtain, the distance between the emitter and the receiver is generally 1-4m. Due to the scattering effect of light, any light receiving tube will receive the light pulses from all infrared emitting tubes. Ordinary li...

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to overcome the problem of insufficient detection accuracy of ordinary light curtains, to provide a kind of high data processing speed, fast system response speed, which can be used in various industrial harsh environments, especially suitable for silicon steel thin plate production lines in metallurgical industry, and can be used for A light curtain system for in-position detection of tiny high-speed moving objects with a thickness of less than 1mm

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