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Extensometer and its measurement method

A measurement method, extensometer technology, applied in the direction of measuring devices, using stable tension/pressure testing material strength, instruments, etc., can solve the problems of complex testing methods, low testing efficiency, low precision, etc., to achieve more accurate Functional test, improved test environment adaptability, and high measurement accuracy

Active Publication Date: 2016-10-05
深圳三思纵横科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the above-mentioned technical defects existing in the existing extensometer technology, and provide an extensometer with a unified design of the optical system and the electrical system, so that the acquisition of video is not disturbed by ambient light, and the acquired high-quality video image The non-contact precision measurement of the force deformation of the sample can not only provide accurate measurement data, but also have dynamic and static multiple measurement functions. Overcome the defects of complex test methods, low precision and low test efficiency in the existing technology

Method used

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Embodiment 1

[0018] figure 1 is a schematic diagram of the extensometer of the present invention, combined with figure 1 The structure of the extensometer of this invention is demonstrated.

[0019] Such as figure 1 The shown extensometer includes: a laser system 1, the laser system 1 is used to generate laser light on the test sample 5 of the test machine; an imaging system 2, the imaging system 2 is used to capture the image of the test sample 5 Image; measurement system 3, the measurement system 3 is used to test image acquisition control and image signal processing, obtain measurement data, and output the data; the measurement system 3 is related to the laser system 1 and the imaging system 2 connect. When testing the sample, the measuring system 3 is connected to the testing machine 4 through the testing machine interface 41 .

[0020] In the extensometer of the present invention, the laser system 1 includes a laser light source device, the laser light source is a continuous laser...

Embodiment 2

[0025] attached figure 2 It is a structural schematic diagram of the extensometer of this embodiment, combined with the attached figure 1 , attached figure 2 The structure and measurement method of the extensometer of the present invention will be further described. Such as figure 1 As shown, the extensometer includes a laser system 1, an imaging system 2, and a measurement system 3. During use, the measurement system 3 is connected to the test machine 4 through the test machine interface 41. The test system of the extensometer can be connected with the computer platform 6.

[0026] In the present invention figure 2 Among them, the sample 5 to be tested is shown in the figure, and test marks 51a, 51b are set on the sample 5, and the marks 51a, 51b set on the sample 5 are bar-shaped marks, and the edges of the two-shaped marks are demarcated Obvious and approximately parallel, and perpendicular to the loading direction of the sample; you can choose to use different mark...

Embodiment 3

[0035] Such as image 3 It is a schematic diagram of the working principle of the dynamic measurement of the measurement system of the present invention. In combination with the schematic diagram, in this embodiment, the steps of the specific measurement method for testing with the extensometer of the present invention are further described.

[0036] In the measurement using the extensometer of the present invention, the steps are as follows: set the sample 5: set the test marks 51a, 51b on the sample 5 to be tested, and fix the sample on the testing machine 4, so that the The above test marks 51a, 51b are always kept within the imaging range of the imaging device 21; adjust the laser system 1: select the laser light source 11 with corresponding power according to the size of the sample 5, adjust the laser beam, and irradiate the laser beam directly on the sample 5 Make the plane of the sample 5 substantially perpendicular to the optical axis; adjust the imaging system 2: thro...

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Abstract

The invention relates to an extensometer and a measuring method thereof. The extensometer structurally comprises a laser system, an imaging system and a measuring system, wherein the laser system is used for generating laser to irradiate on a test sample on a testing machine bench; the imaging system is used for collecting an image of the test sample; the measuring system is used for testing image collecting control and image signal processing to obtain measurement data and outputs the data; the measuring system is connected with the laser system and the imaging system. The invention further provides a measuring method of the extensometer, which comprises the following steps: setting the sample; adjusting the laser system; adjusting the imaging system; testing; measuring. The extensometer adopts the integrated design of the laser system and the imaging system, and has the advantages of compact structure, multifunction, high precision and good environmental adaptability; the measuring method disclosed by the invention has the advantages of simplicity in method, precise measurement and multifunction, can easily measure dynamic and static parameters of the to-be-tested sample, and greatly improves the testing efficiency.

Description

technical field [0001] The invention relates to a material force measuring device and a method thereof, in particular to an extensometer and a measuring method thereof. Background technique [0002] At present, optical extensometers are usually used for non-contact measurement of material stress deformation, and there are two commonly used laser extensometers and video extensometers. Existing laser extensometers are unidirectional and one-dimensional measurements, which use a line laser light source to perform linear scanning between marks relative to the sample, and process the changes in the electrical signals obtained by scanning to obtain the distance between the two marks, thereby measuring The extension and strain of the material, its disadvantage is that it can only output data but not images (sheets), and the measurement range is limited by the line light source and generally does not exceed the length of 130mm. Existing video extensometers do not integrate optical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01B11/16
Inventor 肖若冰曾春英
Owner 深圳三思纵横科技股份有限公司
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