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Real-time measurement method for dynamic three-dimensional deformation of object

A technology of three-dimensional deformation and real-time measurement, which is applied in the field of laser measurement, can solve problems such as the inability to measure three-dimensional dynamic deformation of objects in real time, and achieve the effects of improving accuracy and measurement range, strong anti-interference, and wide application range

Active Publication Date: 2012-01-18
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0006] Aiming at the deficiency that the existing speckle measurement device mentioned in the above background technology cannot measure the three-dimensional dynamic deformation of the object in real time, the present invention proposes a real-time measurement method for the dynamic three-dimensional deformation of the object

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  • Real-time measurement method for dynamic three-dimensional deformation of object
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  • Real-time measurement method for dynamic three-dimensional deformation of object

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Embodiment Construction

[0045] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0046] The object of the present invention is to propose a real-time measurement method for the dynamic three-dimensional deformation of an object in view of the problems existing in the heterodyne time-domain three-dimensional interferometry described in the background art.

[0047]The method of the present invention is applied to a laser measuring device, and the device mainly includes a He-Ne laser (1), a polarization controller (2), a spatial filter and a beam expander (3), an ordinary beam splitter (4), a first polarizer device (5), the first telecentric imaging system (6), the first flat mirror (7), the second analyzer (8), the first polarization beam splitter prism (9), the object to be measured (10), the first ...

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Abstract

The invention discloses a real-time measurement method for the dynamic three-dimensional deformation of an object and belongs to the technical field of laser measurement. The speckle patterns of an inplane X-direction measurement subsystem, an inplane Y-direction measurement subsystem and an out-of-plane Z-direction measurement subsystem are imaged on a CCD (Charge Coupled Device); the speckle patterns obtained by the CCD are subjected to Fourier transform to obtain a spectrogram; and the phase position variation of the object on the basis of time is obtained by the spectrogram so as to calculate deformation amount based on time to obtain the three-dimensional deformation amount of the whole object. By utilizing the real-time measurement method, a detection system is simplified, and the measurement precision and the measurement range are improved; and the real-time measurement method has the characteristics of real-time measurement, three-dimensional measurement, precise measurement, strong anti-interference performance, wide application range and the like.

Description

technical field [0001] The invention belongs to the technical field of laser measurement, in particular to a real-time measurement method for dynamic three-dimensional deformation of an object. Background technique [0002] When the laser is irradiated on the surface of an object with diffuse reflection properties, the light reflected from the surface of the object will coherently superimpose in space, and interference will occur in the entire space, forming randomly distributed bright and dark spots, which are called laser speckle. In the early 1970s, the laser speckle interferometry method was developed. In addition to a series of advantages such as the non-contact of the holographic interferometry method and the ability to obtain the whole field situation intuitively, it also has a simple optical path and no requirements on the surface of the specimen. High, low requirements for experimental conditions, convenient calculation and so on. [0003] Electronic speckle interf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 高瞻韦成邓彦段怡婷冯其波
Owner BEIJING JIAOTONG UNIV
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