A strain type linear bidirectional large displacement sensor and its detection method

Abstract

The invention discloses a strain type linear bidirectional large displacement sensor and a detection method of the strain type linear bidirectional large displacement sensor. According to the strain type linear bidirectional large displacement sensor, a strain sheet is arranged on a displacement strain conversion beam to form a bridge circuit which is connected with a strain gauge, a fixed end of the displacement strain conversion beam is fixed on a detection point, and a freed end of the displacement strain conversion beam is inserted into a rigid guide groove and fixed at a reference position. According to the detection method of the strain type linear bidirectional large displacement sensor, when the detection point moves, the displacement of the rigid guide groove is in linear relation with the strain at the position of the strain sheet on the displacement strain conversion beam, strain values during the movement of the detection point are recorded through the strain gauge, and the displacement value of the detection point is determined through the recorded strain values according to a marked relational expression between the strain and the displacement. The strain type linear bidirectional large displacement sensor is simple in structure, good in repeatability, high in sensitivity, convenient to manufacture and install, low in cost, and suitable for detection and tests in an engineering structure, especially the measurement of large displacement of the engineering structure and components of the engineering structure.

Description

technical field [0001] The invention relates to a displacement sensor and a detection method thereof, in particular to a strain type linear bidirectional displacement sensor and a detection method thereof for engineering structure detection, especially large displacement measurement of engineering structures and components. Background technique [0002] The application of strain gauges can be used to make sensors for measuring various parameters. They have the advantages of high sensitivity, high precision, output as electrical signals, and easy automatic recording and data processing. They have been widely used. Strain sensors can be divided into force sensors, pressure sensors, displacement sensors, acceleration sensors, etc. according to their uses. The principle application is to paste the strain gauges on the elastic elements and connect them into a certain bridge. When the elastic elements are deformed by force, The bridge has an electrical signal output, and the requi...

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Problems solved by technology

[0005] The disadvantage of the above-mentioned prior art one is that the measured displacement cannot be too large, that is, if When is small, the cantilever beam can be regarded as a small deflection beam, , otherwise non-linearity (distortion)

[0007] The weak point of the above-mentioned prior art 2 is that the structure is relatively complicated, the production cycle is long, and the production cost is high, so it is not suitable for non-professional manufacturers to make

It has always been generally believed that the cantilever beam strain sensor is only suitable for measuring small displacements, and it is impossible to measure linear bidirectional large displacements with this structural strain sensor

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