Absolute type grating scale absolute position information correction and read circuit

Abstract

The invention provides an absolute type grating scale absolute position information correction and read circuit and belongs to the field of precision machining and measurement. The absolute type grating scale absolute position information correction and read circuit comprises a photoelectric detector array, a signal amplification circuit array, a sampling holding circuit array, a signal reference correction circuit, a signal gain correction circuit and a correction data storer; the photoelectric detector array sends a position optical signal to the signal amplification circuit array, and the signal amplification circuit array amplifies the signal, and sends the signal to the sampling holding circuit array; the signal reference correction circuit reads reference correction data in the correction data storer and generates a bias voltage; the signal gain correction circuit reads gain correction data and sets a gain range; the signal reference correction circuit and the signal gain correction circuit perform reference, gain and amplification on the signal output by the sampling holding circuit array, so as to provide the signal for A/D use. The circuit solves problems about common-mode noise, non-uniform distribution of a light source, mismatching of a photoelectric detector and the like, and has the characteristics that the structure is simple, the circuit parameters can be configured, and on-chip integration is realized.

Description

technical field [0001] The invention belongs to the field of precision instrument detection, and in particular relates to a correction and reading circuit for absolute position information of an absolute grating ruler. Background technique [0002] Grating rulers are widely used in precision instruments, precision micro-machining, high-precision CNC machine tools and other machining processes, and their performance has a great impact on the quality of machining. [0003] General grating rulers are divided into absolute grating rulers and incremental grating rulers. The implementation method of incremental grating scale is simple and the manufacturing cost is low, but the data will be lost after the system is powered off. The absolute grating scale uses the code track absolute coding technology to record the absolute position information on the grating scale. After the system is powered on, it only needs to read the code information on the grating scale to know the position ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the present invention provides a correction and reading circuit for the absolute position information of the absolute grating ruler, which solves the common mode noise of the absolute grating ruler, the non-uniform distribution of the light source, the photoelectric detection Factors such as incomplete matching of the device have a great influence on the swing and signal-to-noise ratio of the output signal and the problem of complex processing circuits

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