High temperature static strain gauge with compensation strain gauge

Abstract

The invention belongs to the technical field of high temperature strain measurement, and discloses a high temperature static strain gauge with a compensation strain gauge. A working strain gauge sensitive grid, a compensation strain gauge sensitive grid and an insulating layer that are adopted are located in a protective layer; the working strain gauge sensitive grid is located between a lower spraying layer and an upper spraying layer; the compensation strain gauge sensitive grid is fixed on the upper spraying layer by two spraying strips, and is consistent with the working strain gauge sensitive grid in position and direction; the insulating layer is placed on the two spraying strips, and an upper surface of the insulating layer is closely attached to the protective layer; and a working strain gauge lead and a compensation strain gauge lead are located at the tail ends of the working strain gauge sensitive grid and the compensation strain gauge sensitive grid, and are led out from preformed holes of the protective layer. The high temperature static strain gauge with the compensation strain gauge utilizes output of the compensation strain gauge to compensate thermal output of the working strain gauge, thereby eliminating thermal output influence of the strain gauge, and improving precision and reliability of a high temperature static strain measurement result; and a thermal output calibration link is reduced, and thus high temperature static strain measurement is simpler and more convenient.

Description

technical field [0001] The invention relates to the technical field of high-temperature strain measurement, in particular to a high-temperature static strain gauge with a compensation strain gauge. Background technique [0002] High-temperature strain gauge measurement technology is the most important technical means to study the mechanical behavior of high-temperature structural components. [0003] Most of the current strain electrical measurement temperatures are below 300°C, and above 300°C, especially in the field of high-temperature strain measurement at 600°C to 1000°C. Due to the large heat output of high-temperature strain gauges, it must be considered when doing static strain measurement. heat output effects. [0004] At present, the curve correction method of first performing thermal output calibration and then thermal output correction is mostly used; the calibration of the steady-state thermal output of the strain gauge can be easily realized in the resistance ...

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Problems solved by technology

[0004] Nowadays, the curve correction method of first performing thermal output calibration and then thermal output correction is mostly used; the steady-state thermal output calibration of strain gauges can be easily realized in resistance furnaces, but the thermal output of strain gauges is related to the temperature rise rate felt by strain gauges. In particular, there is a large difference between the steady-state heat output and the transient heat output in a rapid temperature-rising environment. Using the steady-state heat output instead of the transient heat output to correct the heat output will bring large errors. Therefore, strain measurement in a rapid temperature-raising environment Transient thermal output calibration must be performed; however, the equipment and methods for transient thermal output calibration are complex, and it is difficult to calibrate instantaneous thermal output

In the actual high-temperature strain measurement, the line compensation method can also be used to eliminate the influence of heat output, but the arrangement of the compensation strain gauge requires that the compensation strain gauge be arranged in a place that has the same temperature field as the working strain gauge but does not feel the strain. It is usually difficult to find such a layout. slice position

[0005] When the high temperature static strain measurement eliminates the influence of heat output, it is more difficult to calibrate the instantaneous heat output, and it is difficult to find the position of the cloth piece that only senses the temperature but not the strain when arranging the compensation strain gauge, resulting in large data errors affected by the heat output of the strain gauge, which seriously affects Accuracy and reliability of measurement results

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