Axially distributed three-sensitive grid metal strain gauges that can measure the axial deflection of the biased sensitive grid center

Abstract

The invention discloses an axially distributed three-sensitive-grid metal strain gauge capable of measuring axial deviation of a biased sensitive grid center. The metal strain gauge comprises a base and three sensitive grids fixed on the base, each sensitive grid comprises a sensitive section and a transitional section, the axes of the sensitive sections are parallel straight lines in the same plane; in the plane, the axial direction is along the axis direction, and the horizontal direction is vertical to the axial direction; axial deviation instead of horizontal deviation exists between the centers of the sensitive grids, each sensitive grid is respectively named as a left sensitive gird, a middle sensitive grid and a right sensitive grid from left to right along the axial direction according to the central position; for the sensitive grid center with higher position in any two sensitive grids, the axial position of each point on each sensitive section is higher than the axial direction of any point on any sensitive section of the other sensitive grid; the proportion of the changing values of the total resistance of the left sensitive grid, the middle sensitive grid and the right sensitive grid is 1 to 4 to 3. The metal strain gauge can be used for effectively detecting the strain axial first-order deviation at the central position of the right 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 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. Distribution of metal strain gauges with three sensitive grids, especially for measuring the axial first-order partial conductance of the corners and edges of the workpiece that have size restrictions on the strain gauges

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