It can measure the axial deviation of the outer axial deflection of the double-sided offset sensitive grid. The six-sensitive grid full-bridge hybrid interdigitated metal strain gauge

Abstract

The invention relates to an axial deviation six-sensitive-grid full bridge mixed interdigital metal foil gauge for measuring axial partial derivatives outside of a double-side bias sensitive grid. The metal foil gauge comprises a substrate and six sensitive grids fixed on the substrate, wherein each sensitive grid includes a sensitive section and a transition section; the axes of all the sensitive sections are parallel lines in the same plane; in the plane, the direction along the axis is the axial direction, and the direction being perpendicular to the axial direction is the transverse direction; the transverse directions between the centers of five sensitive grids have no deviation and the axial directions between the centers of five sensitive grids have deviation; according to the positions of the centers of all the sensitive grids, in the axial direction, from left to right, all the sensitive grids are respectively a left fifth sensitive grid and a left third sensitive grid, and then an intermediate-A sensitive grid and an intermediate-B sensitive grid, and then a right third sensitive grid and a right fifth sensitive grid; and the proportion of the total resistance variation values for all the sensitive grids under the same strain is 5:3:8:8:3:5; and the first four sensitive grids and the lower four sensitive grids are mutually arranged in the interdigital way. The axial deviation six-sensitive-grid full bridge mixed interdigital metal foil gauge can measure the transverse first order partial derivatives at a center at the same time, wherein the distance from the left and right sides of the centers of the left fifth sensitive grid and the right fifth sensitive grid to the center is equal to the distance from the center to the centers of the intermediate-A sensitive grid and the intermediate-B 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. 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 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; ...

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 device that can measure the axial deflection of the outer side of the bias sensitive grid that can measure the strain and can effectively detect the axial deflection of the surface strain. Axial deviation six-sensitive grid full-bridge mixed interdigitated metal strain gauge, especially for measuring the first-order axial deflection of workpiece corners, edges, etc. where the size of the strain gauge is limited or other places where the strain gauge is not suitable

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