Transverse deformation measuring system and method based on laser irradiation intensity variation

A technology of laser irradiation and intensity change, which is applied in the field of measurement, can solve the problems that dynamic deformation cannot be continuously measured, and achieve the effects of simple and clear measurement methods and principles, ensuring the real state, and simple and convenient data processing

Inactive Publication Date: 2016-09-21
WUHAN TEXTILE UNIV
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Problems solved by technology

Similar to the optical interferometry, the speckle method is currently mainly suitable for static deformation measurement, and the evolution of dynamic deformation cannot be continuously measured.

Method used

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  • Transverse deformation measuring system and method based on laser irradiation intensity variation
  • Transverse deformation measuring system and method based on laser irradiation intensity variation
  • Transverse deformation measuring system and method based on laser irradiation intensity variation

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Embodiment Construction

[0038] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0039] The measurement method of the invention converts the mechanical deformation into the change of the light intensity of the light spot projected on the photodetector, and the photodetector converts the change of the light intensity into an electrical signal that can be directly measured.

[0040] The measurement principle of the present invention is: the laser 1, the focusing lens 3, and the photodetector 4 are all placed on the support frame 7, and the geometric centers should be kept on an axis, and their main planes should be parallel to each other. Such as figure 2 As shown, the laser 1 emits a rectangular spot with a length of several millimeters, and projects the spot to a specified position perpendicula...

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Abstract

The invention relates to a transverse deformation measuring system based on laser irradiation intensity variation, which comprises a laser device, an optical filter, a focusing lens, a photoelectric detector and an oscilloscope which are sequentially placed, wherein geometrical centers of the laser device, the focusing lens and the photoelectric detector are kept on an axis, main planes thereof are parallel to one another, and the photoelectric detector is electrically connected with the oscilloscope; the laser device is used for emitting laser, and irradiating the laser on a test piece to be measured arranged between the laser device and the focusing lens as well as on the optical filter behind the test piece to be measured; the photoelectric detector is used for receiving focused laser irradiation and sensing a light intensity signal, and acquiring an electric signal corresponding to the light intensity signal through photovoltaic conversion; and the oscilloscope is used for calculating and displaying the electric signal. The transverse deformation measuring system achieves measurement of material transverse deformation. A measuring device does not need to be adhered to an object to be measured in laser deformation measurement. The transverse deformation measuring system and a transverse deformation measuring method provided by the invention have high measurement precision and can capture any slight transverse deformation produced by the test piece.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a lateral deformation measurement system and method based on changes in laser irradiation intensity. Background technique [0002] In the process of studying the loading and deformation of materials, people found that when the material is loaded axially, while the deformation occurs in the axial direction, the material will expand or shrink in the transverse direction. People define the deformation in the transverse direction as is a Poisson deformation. Lateral deformation is an important performance parameter to characterize the mechanical properties of materials, so the measurement of lateral deformation is also an important part of exploring the mechanical response of materials. For the measurement of transverse deformation, there are two traditional methods: one is to measure the longitudinal strain of the specimen. For materials with uniform structure and single compo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 黄承义王攀刘旭
Owner WUHAN TEXTILE UNIV
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