Strain value correction method under condition of arrangement deviation of precise diaphragm strain element

Abstract

The invention provides a strain value correction method under the condition of arrangement deviation of a precise diaphragm strain element, and provides strain value correction methods under one-dimensional and two-dimensional deformation conditions respectively through deducing a resistance change rate formula of a resistance strain gauge to obtain an expression of an overall sensitivity coefficient of the strain gauge and through an arrangement deviation angle of the strain element. The method has the beneficial effects that the correlation between the strain measurement value of the precise diaphragm and the pasting angle of the strain gauge is considered, the strain value of the precise diaphragm under the condition of deviation of the strain element arranged on the precise diaphragm is corrected, and the precision of strain measurement by pasting the strain gauge on the precise diaphragm is improved. The improvement of the precision can improve the deformation measurement precision in a strain sensor and a precision structure test to the greatest extent, and the application of the strain sensor at an extreme temperature is served.

Description

technical field [0001] The invention belongs to the field of sensor science and technology, and particularly relates to a strain value correction method under the condition of deviation of arrangement of precision diaphragm strain elements. Background technique [0002] Resistive strain gauges are widely used in the mechanical properties testing of devices based on their good stability. The core of the resistance strain gauges is the sensitive grid in the strain gauges composed of conductor materials. The effect accumulates many small deformations generated in the testing process into a large deformation, thereby affecting the resistance value of the strain gauge, which can be intuitively measured by professional testing instruments. Through the calculation formula, the strain amount of the strain gauge can be inverted. [0003] Generally, the strain gauge can only measure the line strain or regional equivalent strain in a certain direction, that is, when using it, first st...

AI Technical Summary

Problems solved by technology

For conventional devices, when the strain gauges are pasted tilted, the original strain gauges can be cleaned and pasted again to the correct position; but for precision structures, cleaning the original strain gauges and pasting them again cannot ensure the integrity of the precision devices, and even affect the integrity of the precision devices. Normal use; at the same time, such precision structures are often expensive and require high integrity

In addition, some special-shaped structures have reasons such as small strain measuring point area and singular test orientation, which makes it difficult or even impossible to accurately arrange strain elements, resulting in inherent test errors in the arranged strain elements

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