Axial deviation three sensitive grid interdigital metal strain gauge capable of measuring bias sensitive grid center axial partial deviation

Abstract

The invention relates to an axial deviation three sensitive grid interdigital metal strain gauge capable of measuring bias sensitive grid center axial 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 transverse deviation exists among three sensitive grid centers, axial deviation exists among the three sensitive grid centers, the sensitive grids are respectively a left sensitive grid, a middle sensitive grid and a right sensitive grid from left to right axially according to the sensitive grid center positions, the left and middle sensitive grids are distributed in an interdigital mode, the middle and the right sensitive grids are distributed in an interdigital mode, and the ratio of total resistance change values of the left sensitive grid, the middle sensitive grid and the right sensitive grid under the same strain condition is 1:4:3. The strain gauge can measure axial first order partial deviation of the right sensitive grid center position.

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 deflector, the present invention provides an axial deflector that can measure the axial deflector of the center of the bias sensitive grid, which can measure the strain and effectively detect the axial deflector of the surface strain. The deviation three-sensitive grid cross refers to the metal strain gauge, especially for measuring the axial first-order partial conduction of the corners and edges of the workpiece that have size restrictions on the strain gauge.

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