Laterally distributed six-sensitive grid full-bridge metal strain gauges that can measure the lateral deflection of the laterally biased sensitive grid

Abstract

A transversely distributed six-sensitive-grid-grid full-bridge metal foil gauge which can measure outside lateral partial derivatives of bilateral bias sensitive grids comprises a substrate and six sensitive grids. The six sensitive grids are fixed on the substrate. Each sensitive grid comprises a sensitive segment and a transition segment. The axes of all the sensitive segments are parallel lines in a same plane. The axial direction in the plane is along the axis direction of the sensitive segments, and the direction perpendicular to the axial direction is the transverse direction. The centers of the six sensitive grids have no deviation along the axial direction, and deviations exist in the transverse direction. The sensitive grids are sequentially an upper fifth sensitive grid, an upper third sensitive grid, a middle upper sensitive grid, a middle lower sensitive grid, a lower third sensitive grid and a lower fifth sensitive grid from the top to the bottom along the transverse direction according to the center positions. The changing values of the total resistances of the six sensitive grids under the same strain are 5:3:8:8:3:5. According to the invention, transverse first-order partial derivatives of an upper outer side of the upper fifth sensitive grid and a lower outer side of the lower fifth sensitive grid can be simultaneously measured; the distance between the upper outer side of the upper fifth sensitive grid and the center of the upper fifth sensitive grid is equal to the distance between the center of the middle upper sensitive grid and the center of the middle lower sensitive grid; and the distance between the lower outer side of the lower fifth sensitive grid and the center of the lower fifth sensitive grid is equal to the distance between the center of the middle lower sensitive grid and the lower fifth sensitive grid.

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] [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. In 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 resistance value of the metal material. When the metal material is stretched, the length increases, the cross-sectional area decreases, and the resistance value increases; when...

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 lateral distribution that can measure the lateral deflection of the outer lateral deflection of the double-sided bias sensitive grid, which can not only measure the strain but also effectively detect the lateral deflection of the surface strain. Six sensitive grid full-bridge metal strain gauges, especially for measuring workpiece corners, edges, etc. where the size of the strain gauge is limited or other transverse first-order partial conduction where the strain gauge position is not suitable.

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