Contact High-Temperature Strain Automatic Calibration and Precision Compensation Research

Abstract

Automated control and calibration are important components in industrial process and in artificial intelligence system and robotics. In order to solve the problem of contact high-temperature strain precision measurement, this paper established an automatic calibration device for high-temperature strain gauges. The temperature of the high-temperature furnace is automatically controlled by the temperature control device. The electric cylinder is driven by the servo motor to apply the load to the calibration beam. The output signal of the high-temperature strain gauge, the thermocouple signal, and the displacement signal of the grating ruler are collected at the same time. The deformation measurement results obtained after temperature correction are used to calculate the theoretical mechanical strain, which are fed back to control the loading action to complete the automatic calibration process. Based on the above calibration device, the high-temperature strain measurement accuracy correction software is developed to calibrate the high-temperature strain gauge with multiparameters, and the curves of sensitivity coefficient, thermal output, zero drift, and creep characteristics with temperature are obtained, and a strain measurement accuracy compensation model is established. The high-temperature strain measurement experiment is carried out to verify that the modified model can meet the requirements in each temperature range.