Transverse deviation three sensitive grid interdigital metal strain gauge capable of measuring bias sensitive grid center transverse partial deviation

Abstract

The invention relates to a transverse deviation three sensitive grid interdigital metal strain gauge capable of measuring bias sensitive grid center transverse partial deviation. The strain gauge comprises a base and three sensitive grids fixed on the base, wherein each sensitive grid comprises a sensitive segment and a transition segment, axial lines of all the sensitive segments are coplanar parallel straight lines, in the plane of the axial lines of the sensitive segments, the direction along with the axial line direction of the sensitive segments is the axial direction, the direction perpendicular to the axial direction is the transverse direction, no axial deviation exists among three sensitive grid centers, transverse deviation exists among the three sensitive grid centers, the sensitive grids are sequentially arranged according to orders of sensitive grid center positions and are respectively an upper sensitive grid, a middle sensitive grid, a lower sensitive grid from up to down transversely, in the plane of the axial lines of the sensitive segments, the upper and middle sensitive grids are distributed in an interdigital mode, the middle and the lower sensitive grids are distributed in an interdigital mode, and the ratio of total resistance change values of the sensitive segments of the upper sensitive grid, the middle sensitive grid and the lower sensitive grid under the same strain condition is 1:4:3. The strain gauge can measure transverse first order partial deviation of the lower sensitive grid center.

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

[0013] In order to overcome the deficiency that the existing metal strain gauges cannot detect the strain deflection, the present invention provides a three-sensitivity sensor capable of measuring the strain and effectively detecting the lateral deflection of the surface strain. Grid cross refers to metal strain gauges, especially for measuring the lateral first-order partial conductance of workpiece corners, edges, etc. where the size of the strain gauge is restricted.

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