Wide-range displacement measuring device and method of visual scanning linear variable density stripe ruler

Abstract

The invention relates to a wide-range displacement measuring device and method of a visual scanning linear variable density fringe ruler, and the device comprises the linear variable density fringe ruler which is used for measuring the displacement information of a sliding rail; the imaging module is fixedly arranged on the sliding rail and is used for carrying out continuous imaging and data acquisition on the linear variable density stripes on the stripe ruler and transmitting the acquired information to the processing module; the displacement sliding platform is used for driving the sliding rail to drive the imaging module to do linear motion, so that the imaging module performs linear imaging on the linear variable density stripes; and the processing module is used for controlling the imaging module, processing the imaging stripe information in real time, obtaining a stripe density signal frequency change curve according to the density change rule of the imaging stripes, establishing a mapping relation and a mathematical model between the frequency change information and the actual displacement of the sliding rail, and further calculating the actual displacement information of the sliding rail. The device and the method are beneficial to improving the measurement efficiency and the measurement precision, and the device is simple and low in implementation cost.

Description

technical field [0001] The invention belongs to the field of machine vision measurement, in particular to a large range displacement measuring device and method of visual scanning linear variable density fringe ruler. Background technology [0002] In the machining process of the machine tool, due to friction, tool wear and other reasons, there will be errors in the tool path of the machine tool, which will affect the machining quality of the workpiece. Therefore, it is necessary to compensate the cutting error of the machine tool to improve the machining quality of the workpiece. [0003] At present, in order to improve the machining accuracy, grating ruler, magnetic grating ruler and ball grating ruler are often used in machine tools. The grating ruler takes the optical glass scribed line as the measurement benchmark, installs the optical glass into the aluminum alloy ruler body and the reading head and other accessories to form the grating ruler. The aluminum alloy semi sealin...

AI Technical Summary

Problems solved by technology

Grating rulers are widely used, but due to their semi-sealed design, if water, oil, or iron filings enter during use, the grating may be damaged, and the grating is not easy to process, and the replacement cost is relatively high

Because the magnetic scale adopts the magnetic tape principle, the price is low and the installation is simple, but the measurement accuracy will be affected due to the wide reference signal and the existence of degaussing problems.

The ball scale utilizes the change of the amount of magnetic medium to realize electromagnetic / magnetoelectric conversion, with high precision, and because it is a fully sealed design, it is not easily damaged by the working environment, but its cost is high

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