High-speed and high-precision light curtain detection device based on FPGA (field programmable gate array) and FPAA (field programmable analog array)

Abstract

The invention discloses a high-speed and high precision light curtain detection device based on an FPGA and an FPAA. The device comprises a light curtain emitter and a light curtain receiver, wherein infrared transmitting tubes are arranged on the light curtain emitter; receiving photocells are arranged on the light curtain receiver; the infrared transmitting tubes, as well as the receiving photocells, are distributed in double rows and staggered in a plane; and a system core of the light curtain emitter and the light curtain receiver is based on two types (FPGA / FPAA) of super-large-scale digital / analog integrated circuits, that is, by means of a site reconfigurable characteristic of the FPAA and a parallel processing characteristic of the FPGA, the FPAA preprocesses a light envelope signal, and then the FPGA performs real-time in-place detection and edge detection on an object. With the adoption of the technical scheme, the high-speed and high precision light curtain detection device has the advantages as follows: the data processing speed and the system response speed are high, interference resistance is high, and the upgrade is convenient; the device can be applied to various industrial severe environments, in particular to a deformed steel bar production line of a bar production factory in the metallurgical industry; and in-place detection and size measurement performed on tiny objects moving at high speeds can be realized.

Description

technical field [0001] The invention relates to a light curtain system for realizing in-position detection and size measurement of tiny, high-speed moving objects, and belongs to the field of optical computing equipment. Background technique [0002] The light curtain is a special through-beam photoelectric sensor, which includes two parts: the transmitter and the receiver. The transmitter drives an infrared tube to emit a beam of infrared rays at regular intervals along the length direction, generating a carrier infrared array, and the receiver arranges the same number of photocells at the same interval. When working, first a transmitter sends out a light pulse and the corresponding receiver searches for the pulse at the same time. When it is found, it completes the scanning of one channel, and then turns to the next channel until all the scanning is completed. After a period of scanning is completed, the system records which channels are clear and which channels are block...

AI Technical Summary

Problems solved by technology

This method uses a single-chip microcomputer as the control core, the detection speed is slow, and the response time needs to be more than 100ms

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