Axially-distributed five sensitive grid side-interdigital metal strain gauge capable of measuring two-side gauge outside axial partial derivative

Abstract

The invention provides an axially-distributed five sensitive grid side-interdigital metal strain gauge capable of measuring two-side gauge outside axial partial derivatives. The axially-distributed five sensitive grid side-interdigital metal strain gauge comprises a substrate and five sensitive grids fixed on the substrate, wherein each sensitive grid comprises sensitive sections and transition sections, and axes of all the sensitive sections are in the shape of coplanar parallel straight lines; a direction along the direction of the axes of the sensitive sections in the plane is the axial direction, and a direction vertical to the axial direction is the transverse direction; centers of the sensitive grids have no deviation in the transverse direction and have deviation in the axial direction; the sensitive grids are respectively called a left seventh sensitive grid and a left fifth sensitive grid, then a middle sensitive grid, and finally a right fifth sensitive grid and a right seventh sensitive grid from the left to the right along the axial direction according to the sequence of central positions of the sensitive grids; the two sensitive grids on the left side are arranged in an interdigital mode, and the two sensitive grids on the right side are arranged in an interdigital mode; and total resistance variation values of the sensitive grids under the same strain are shown as 7:5:12: 5:7. Through the time-sharing multiplexing of the middle sensitive grid, the axially-distributed five sensitive grid side-interdigital metal strain gauge can detect strain axial first-order partial derivatives at positions where the distance from the left or right outer side of the center of each of the left seventh sensitive grid and the right seventh sensitive grid to the corresponding center equals the distance from the center to the corresponding center of each of the right fifth sensitive grid and the left fifth sensitive grid almost simultaneously.

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 an axial distribution that can measure the axial deflection of the external axial deflection of the double-sided sheet, which can not only measure the strain but also effectively detect the axial deflection of the surface strain. The metal strain gauges on the five-sensitivity grid side are interdigitated, especially for measuring the corners and edges of the workpiece where the size of the strain gauges is limited or other axial first-order deflectors that are not suitable for the location of the strain gauges.

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