Medium-temperature foil type resistance strain gauge

Abstract

The invention discloses a medium-temperature foil type resistance strain gauge. The medium-temperature foil type resistance strain gauge comprises a substrate, a sensitive grid and a sealing layer, wherein the sensitive grid is firmly adhered to the substrate and is sealed by the sealing layer; the substrate is made of an enhanced polyimide composite material or an enhanced organic silicon resin composite material; the sensitive grid is made of a Karma alloy, an Even alloy or a nickel-chromium alloy; and the sealing layer is made of polyimide or an organic silicon resin material. The medium-temperature foil type resistance strain gauge improves the stress-strain measurement accuracy in a medium-temperature environment, and the average heat output coefficient of the strain gauge is controlled in a range of 2 mu epsilon / DEG C; in the medium-temperature environment, the strain gauge has stable properties such as relative sensitivity coefficient, creep deformation and the like, can stably measure signals, and has the functions of creep deformation self-compensation and elasticity modulus self-compensation; the aging resistance and oxidation resistance of the materials of the substrate and sealing layer of the strain gauge are improved in the medium-temperature environment; and the adaptive temperature range can be expanded to be between -30 and 400 DEG C, and the consistency of the measurement accuracy is good.

Description

technical field [0001] The invention relates to a foil-type resistance strain gauge, in particular to a medium-temperature foil-type resistance strain gauge suitable for a temperature range of 60°C to 300°C. Background technique [0002] With the continuous development of science and technology, the application fields of foil resistance strain gauges have been very extensive. At the same time, people have higher and higher requirements for the measurement performance of strain gauges. The medium temperature foil resistance strain gauge is a measuring instrument component used in the temperature range of 60°C to 300°C. However, up to now, this kind of strain gauge has always had relatively large defects. Specifically, when the measurement environment temperature exceeds 120°C When , the stability of the strain gauge becomes worse, the measurement accuracy decreases, and the error increases. Through in-depth research, it is found that the reason for the above problems is that...

AI Technical Summary

Problems solved by technology

The medium temperature foil resistance strain gauge is a measuring instrument component used in the temperature range of 60°C to 300°C. However, up to now, this kind of strain gauge has always had relatively large defects. Specifically, when the measurement environment temperature exceeds 120°C When , the stability of the strain gauge becomes worse, the measurement accuracy decreases, and the error increases

Through in-depth research, it is found that the reason for the above problems is that the base and sealing layer of the existing medium-temperature foil resistance strain gauge are made of polyimide material, and the sensitive grid is made of copper-nickel alloy material. When the ambient temperature exceeds 120 ℃, the performance of the substrate and sealing layer will change abruptly, that is, the insulation performance will decrease, the stability and reliability will decrease, and the output signal of the strain gauge will drift; at the same time, the relative sensitivity coefficient and creep performance of the sensitive grid will produce a step Changes, so that the average heat output of the strain gauge increases to one thousand or even thousands of micro-strains, which leads to an increase in the discreteness of the measurement data of the strain gauge, a decrease in measurement accuracy, and an increase in error

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