Method for treating errors of angle measurement of circular grating and compensating skew of shafting

Abstract

The invention discloses a method for treating errors of the angle measurement of a circular grating and compensating the skew of a shafting. The method comprises the following specific steps: the real-time location information of a rotation angle acquired by a reading head which is matched with a circular grating disc is collected by a field programmable gate array (FPGA); after calculation and treatment, the FPGA outputs an angle count value which corresponds to the position of the rotation angle and transmits the angle count value to a central processing unit; the central processing unit calculates the rotation angle value relative to an absolute zero position of the current rotation angle position and displays and outputs calculation results; and the vertical angle error caused by the skew of the shafting is compensated and corrected. The method has the beneficial effects that by the method of correcting angles by the piecewise linearity, angle values are corrected piecewise and the skew errors of the shafting are compensated in real time in the working range of the circular grating, so that the requirements of precise angle measurement in complex environment and under limited condition of high-precise circular gratings are realized and the accuracy of the angle measurement of calibration instruments of angle measuring and orienting equipment is increased.

Description

technical field [0001] The invention relates to the technical field of calibration instruments for angle measurement and orientation equipment. Background technique [0002] For photoelectric angle measuring instruments such as theodolite, modern laboratories usually use traditional verification devices for verification. The traditional verification device consists of a vertical multi-tooth indexing table, a horizontal multi-tooth indexing table, and an autocollimator Composed with the instrument base, there is a reticle with a reticle on the focal plane of the self-collimating collimator. Through the rotation of the vertical multi-tooth indexing table, it forms an infinite target in the horizontal direction at any angle with the collimator; through the horizontal multi-tooth The rotation of the tooth index table constitutes an infinite target in the vertical direction. The traditional verification device has a complex structure and high cost. [0003] With the continuous i...

AI Technical Summary

Problems solved by technology

However, there is still no effective method to realize the measurement error caused by the angle measurement data of the circular grating and the skew of the shaft system during the high-precision, fast and continuous measurement process of the symmetrical axis.

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