Transversely-distributed-six-sensitive-grid full bridge three-interdigital metal foil gauge for measuring transverse partial derivatives of single-side double bias sensitive grid center

Abstract

The invention provides a transversely-distributed-six-sensitive-grid full bridge three-interdigital metal foil gauge for measuring transverse partial derivatives of a single-side double bias sensitive grid center. The transversely-distributed-six-sensitive-grid full bridge three-interdigital metal foil gauge comprises a substrate and six sensitive grids fixed on the substrate, wherein two ends of each sensitive grid are respectively connected with a pin; 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 axial directions between the centers of all the sensitive grids have no deviation and the transverse directions between the centers of five sensitive grids have deviation; the six sensitive grids are a sparse-A sensitive grid, a sparse-B sensitive grid, an intermediate-A sensitive grid, a intermediate-B sensitive grid, a dense-A sensitive grid and a dense-B sensitive grid in the transverse direction from top to bottom according to the sequence of the center positions of the six sensitive grids; every two sensitive grids of the upper part, the middle part and the lower part are arranged in the interdigital way; and the resistance variation values for all the sensitive grids under the same strain are 1:1:4:4:3:3. The transversely-distributed-six-sensitive-grid full bridge three-interdigital metal foil gauge can detect the strain transverse first-order partial derivatives at the centers of the dense-A and dense-B sensitive grids at the same time.

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 a lateral deflector that can measure the lateral deflection of the surface strain and can measure the lateral deflection of the center of the single-side double-biased sensitive grid. Distribution of six sensitive grid full-bridge three-finger metal strain gauges, especially for measuring the lateral first-order partial conductance of workpiece corners, edges and other parts that have size restrictions on the strain gauges

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