Automatic calibration device and calibration method for strain gauge

Abstract

The invention provides an automatic calibration device and calibration method for a strain gauge. The automatic calibration device adopts a grating displacement sensor as a standard, a stepper motor for driving, a controller for controlling, reading and processing data, and a closed-loop system is completely adopted, so that full-automatic calibration and detection are realized for the strain gauge, wherein the output accuracy of the grating displacement sensor is 3 mum, so the detection accuracy is guaranteed; a horizontal base is provided with two V-shaped guide rails which are parallel to each other, so that a movable flame can not deflect or tilt when running with load, and the loading capacity and the application range can be improved; and a high-precision ball screw can be guaranteed to transfer enough torsion accurately during the movement process. With the adoption of the method, continuous measurement for multiple positions can be realized, the work efficiency of measurement can be improved, a calibration equation adopts a simple cubic equation, so that the calibration process is greatly simplified, a zero-returning step eliminates an accumulated error caused by long-term work of a controller, and further, the detection accuracy of the method is improved.

Description

technical field [0001] The invention belongs to the field of computer measurement and control, and in particular relates to a strain gauge automatic calibration device and a calibration method. Background technique [0002] Strain gauge is a kind of measuring instrument widely used in engineering quality inspection. It has a wide variety and is mainly used for strain measurement of various structures such as dams, bridges, pipelines, supports, and steel piles. In use, they can be embedded directly in concrete to measure long-term strain of foundation piles, bridges, dams, containment shells, tunnel linings, etc. Therefore, the performance and accuracy of strain gauges are of great significance to the safety of construction projects. [0003] Especially in recent years, engineering quality accidents such as bridge cracks and building collapses have occurred from time to time across the country, which have caused heavy losses to national property and brought great safety haza...

AI Technical Summary

Problems solved by technology

[0004] At present, various domestic industries have uneven requirements for the accuracy of strain gauges, and there is no unified verification procedure, which makes it very unfavorable for the technical supervision department to supervise the instrument.

In addition, there is no ready-made verification equipment for the linear error and repeatability of the most important measurement indicators, and most of them use dial indicators or digital display vernier calipers for detection

This method has low detection accuracy and difficult positioning, and it is difficult to ensure the accuracy of measurement

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