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Photoelectric stressometer

A strain gauge, photoelectric technology, applied in the field of strain gauges, can solve the problems of high power consumption, long acquisition cycle, unsuitable for measuring devices, etc., and achieve the effect of extremely low power consumption

Active Publication Date: 2014-02-26
THE FIRST ENG CO LTD OF CTCE GRP
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Problems solved by technology

[0002] At present, the vibrating wire strain gauge is widely used in engineering. Since this strain gauge needs to transmit excitation electric energy from an external device (reader) in actual measurement, and then collect measurement data, its shortcoming is that the electric energy Large power consumption, long acquisition cycle, not suitable for use in systematic and automated acquisition sites as measurement devices

Method used

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example

[0036] The strain tube is used as the shell and supporting member of the device, and it is also the stress sensing part of the main body of the measurement. The following first understands the mathematical relationship between the deformation displacement of the strain tube (only refers to the case of axial strain) and the measurement data.

[0037] For this example, when the maximum measurement range of the design object (compression / tension) axial stress σ=400MPa, the elastic modulus of the strain tube (refer to carbon steel 196-216GPa) E=200GPa, the distance between the strain seat A and the strain seat B L=110mm, strain axis diameter φ=5mm, connecting rod length M=100mm;

[0038] Suppose: the displacement variable between strain seat A and strain seat B is ΔL, and the displacement of the shading plate is ΔS;

[0039] According to the calculation relationship of the elastic modulus of the material, the following equation is deduced and solved:

[0040] ΔL ...

specific Embodiment

[0042] The device of the invention is composed of a strain tube and its plug, an opposite rubbing mechanism, a photoelectric collection module and a circuit module.

[0043] The shape and structure of the strain tube refers to the materials and specifications of the strain gauge commonly used in engineering at present (. The appropriate positions at both ends of the strain tube are pre-processed with internal threads as assembly plugs and connection ports for engineering installation. One side of the strain tube is reserved On the other side, process two positioning through holes for fixing the two strain seats respectively.

[0044] Two strain seats, short guide rods, long guide rods, strain shafts and connecting rods are combined and assembled according to the process specifications to form a rubbing mechanism assembly. After the rubbing mechanism assembly is embedded in the positioning through hole reserved for the strain tube, it is welded externally. Permanently fixed.

...

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Abstract

Disclosed in the invention is a photoelectric stressometer comprising a strain tube. Two strain seats are installed at the inner wall of one side of the strain tube; a short guide rod is installed at the end of one strain seat with the long length and a long guide rod is installed at the end of the other strain seat with the short length; and the end of the long guide rod extends below the short guide rod. And a strain shaft is arranged between the short guide rod and the long guide rod; a connecting rod is connected to the strain shaft; and a light shielding plate is installed at the end of the connecting rod. In addition, the photoelectric stressometer also includes a photoelectric acquisition module consisting of a light source, a convex lens, a beam splitter, a reference photosensitive tube, a measurement photosensitive tube, a reference diaphragm, and a measuring diaphragm; the convex lens and the beam splitter are successively arranged at a light-emitting light path of the light source; the reference diaphragm and the reference photosensitive tube are successively arranged at the reflection light path of the beam splitter; and the measuring diaphragm and the measurement photosensitive tube are successively arranged at the light transmission path of the beam splitter. And the light shielding plate extends between the beam splitter and the measuring diaphragm. The provided photoelectric stressometer has the advantages of real-time measurement, extremely low power consumption, and data outputting based on an international standard interface.

Description

technical field [0001] The invention relates to the field of strain gauges, in particular to a photoelectric strain gauge used for monitoring stress changes inside structures in engineering. Background technique [0002] At present, the vibrating wire strain gauge is widely used in engineering. Since this strain gauge needs to transmit excitation electric energy from an external device (reader) in actual measurement, and then collect measurement data, its shortcoming is that the electric energy The power consumption is large and the collection period is long, so it is not suitable for use as a measurement device in a systematic and automatic collection site. Contents of the invention [0003] The purpose of the present invention is to provide a photoelectric strain gauge to overcome the deficiencies in the prior art. [0004] In order to achieve the above object, the technical scheme adopted in the present invention is: [0005] The photoelectric strain gauge is characte...

Claims

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Application Information

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IPC IPC(8): G01L1/24
Inventor 何宏盛杨仲杰梁超刘武生吴艾久周健宝张杰胜
Owner THE FIRST ENG CO LTD OF CTCE GRP
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