A Large Range Differential Resistive Strain Gauge

Abstract

The present invention disclosed a large number of different dynamic resistance -type strain meters, including the end components that are connected in turn, the protective shell of the built -in differential dynamic structure, and the tail component.Connecting the lower structures connected to the tail component, the upper structure and lower structural parts set the structure component group in order from top to bottom.The dynamic steel wire is located on the front and back of the structural parts, respectively, and is arranged in X -symmetrical. The two ends of the front differential steel wire are fixed with the front side of the upper structure and the lower part of the lower structure.The rear side of the lower form component is fixed, and the length of the upper structural parts and the lower structural parts is greater than the marking distance of the large amount of motion resistance.The parameters of the present invention are accurate, the range of range is easy to regulate, the differentiality of the differential sensor structure, and the existing output range of the full range.

Description

Technical field [0001] The present invention involves a large amount of motion -resistant resistance, which belongs to the field of strain meter technology. Background technique [0002] Differential resistance -resistant strain instruments have simple and long -term stability, etc., and are widely used in the field of rock and soil engineering and other structural strain monitoring. [0003] Existing differentiated resistance -type strain figure 1 It is generally composed of the end, protective shell, differential sensor structure and tail. The different dynamic dynamic structure is assembled by different dynamic steel wires and corresponding structures. figure 2 Essence Through the welding of the end, the tail flange, and the measured structure, the deformation of the measured structure causes the deformation of differential steel wires, so as to obtain the change of the resistance of the wire resistor and its ratio. The change. [0004] There are the following disadvantages of...

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Problems solved by technology

[0004] The existing differential resistance strain gauge has the following disadvantages: the differential sensing structure such as figure 2 As shown, the differential steel wire is an inner and outer ring structure. To ensure that the length of the inner and outer ring steel wires is basically the same, the number of winding turns of the inner and outer ring steel wires must be unequal. Obviously, when the structure has a certain displacement, the deformation of the inner and outer ring steel wires is different. Yes, and in most cases, in order to meet the different tension and compression states of the actual application scene, the initial prestress of the two groups of steel wires is different

It is not difficult to see that in the same measurement environment, when the temperature change is the main factor, the temperature influence coefficient of the differential steel wire resistance is not the same, and the use of the same temperature influence coefficient will inevitably sacrifice the accuracy of the instrument parameters

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