Angle displacement measurement system adopting twin-line array image detector

Abstract

The invention discloses an angle displacement measurement system adopting a twin-line array image detector, the system mainly comprises a main shaft, a light source, a pair of optical lens, a grating code disc, the twin-line array image detector, a data acquisition circuit and a decoding and angle fine division circuit, when the system is working, the main shaft drives the grating code disc to rotate, the light source emits a collimated light source to penetrate the grating code disc and map to a linear image detector through the pair of optical lens to image, the data acquisition circuit acquires data of one linear image detector and transmits to the decoding and angle fine division circuit to process, initial angle data is obtained, data of another linear image detector arranged on diametrical position is acquired to realize error compensation calculation for the initial angle data, and measured angle information is outputted. According to the invention, the linear image detector is adopted to realize the identification of grating code disc rotating angle displacement, the twin-line array image detector is adopted to realize error correction, and the angle measurement precision is greatly improved when the angle displacement measurement is realized by using a small-size grating code disc.

Description

technical field [0001] The invention relates to the technical field of photoelectric displacement precision measurement, and more specifically relates to an angular displacement measurement system using a double image detector. Background technique [0002] Photoelectric encoder is a digital angle position sensor integrating light, machine and electricity. It is widely used in photoelectric theodolite, radar, Aerospace, robotics, CNC machine tools, directors and high-precision closed-loop speed control systems and many other fields. In aerospace, military, and industrial fields that have strict requirements on the volume and weight of devices, the requirements for photoelectric encoders are not only to reduce the outer diameter and weight, but also to improve the resolution and accuracy of photoelectric encoders. While reducing the size of the code disc, improving the resolution and angle measurement accuracy of the photoelectric encoder is a current research hotspot. [0...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing small-size photoelectric encoder cannot achieve high resolution and has a large angle measurement error, and provides an angular displacement measurement system using a dual-front image detector

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