Axial deviation full-bridge full-interdigital metal strain sheet capable of measuring surface strain axial partial derivative

Abstract

The invention provides an axial deviation full-bridge full-interdigital metal strain sheet capable of measuring a surface strain axial partial derivative. The axial deviation full-bridge full-interdigital metal strain sheet comprises a substrate and four sensitive gates. The two ends of each sensitive gate are respectively connected with a lead-out line. Each sensitive gate comprises a sensitive segment and a transition segment. The axes of all the sensitive segments are straight lines which are arranged in the same plane in parallel. Direction along the axes of the sensitive segments is an axial direction, and direction perpendicular to the axial direction is a transverse direction. The four sensitive gates are consistent in resistance and consistent in resistance variation under the same strain. The centers of the four sensitive gates are arranged in the same straight line which is parallel to the axis of any sensitive segment of the four sensitive gates. The four sensitive gates are respectively called a left sensitive gate, an intermediate left sensitive gate, an intermediate right sensitive gate and a right sensitive gate from left to right along the direction of the straight line. The centers of the four sensitive gates have deviation in the axial direction and have no deviation in the transverse direction. Any two sensitive gates are arranged in an interdigital mode. Strain can be measured and the surface strain axial first-order and second-order partial derivatives can be effectively detected further.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a metal strain gauge. Background technique [0002] The working principle of the metal resistance strain gauge is the resistance strain effect, that is, when the metal wire is subjected to strain, its resistance changes correspondingly with the magnitude of the mechanical deformation (stretch or compression). The theoretical formula for the resistance strain effect is as follows: [0003] R = ρ L S - - - ( 1 ) [0004] Where R is its resistance value, ρ is the resistivity of the metal material, L is the length of the metal material, and S is the cross-sectional area of ​​the metal material. During the process of mechanical deformation of the metal wire under strain, ρ, L, and S will all change, which will inevitably cause changes in the ...

AI Technical Summary

Problems solved by technology

[0012] In order to overcome the deficiency that the existing metal strain gauges cannot detect the strain deflection, the present invention provides a shaft that can measure the axial deflection of the surface strain and can effectively detect the axial first-order and second-order deflection of the surface strain. Full bridge and full interdigitated metal strain gauges with deflection

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