Transverse deviation double sensitive gate interdigital metal strain sheet capable of measuring surface strain transverse partial derivative

Abstract

The invention provides a transverse deviation double sensitive gate interdigital metal strain sheet capable of measuring a surface strain transverse partial derivative. The transverse deviation double sensitive gate interdigital metal strain sheet comprises a substrate and two sensitive gates. The two ends of each sensitive gate are respectively connected with a lead-out line. The two sensitive gates are fixed on the substrate. 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. In the plane determined by the axes of the sensitive segments, direction along the axes of the sensitive segments is an axial direction, and direction perpendicular to the axial direction is a transverse direction. The two sensitive gates are consistent in resistance and consistent in resistance variation under the same strain, and the two sensitive gates are respectively called an upper sensitive gate and a lower sensitive gate from the top to the bottom along the transverse direction. In the plane determined by the axes of all the sensitive segments, the upper sensitive gate and the lower sensitive gate are arranged in an interdigital mode. The centers of the two sensitive gates have no deviation in the axial direction and have deviation in the transverse direction. Strain can be measured and the surface strain transverse first-order partial derivative 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 lateral deviation double sensitive grid interdigitated type that can measure the strain and effectively detect the lateral deflection of the surface strain. Metal strain gauge

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