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Three-dimensional speckle strain measurement device and measurement method thereof

A technology of strain measurement and measurement method, which is applied in the field of measurement, can solve the problems of inability to respond to field deformation, high system cost, and limited use range, etc., and achieve the effects of fully automated calculation, simple system requirements, and short measurement cycle

Active Publication Date: 2010-02-24
XI AN JIAOTONG UNIV
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Problems solved by technology

The main disadvantages are: the quality and stability of the sensor after pasting is affected by the aging of the substrate, adhesive, protective agent and the quality of manual work during the pasting process, and it is prone to long-term drift and unstable quality, and the temperature stability is poor and cannot respond overall field deformation
The main disadvantages are: when the light output of the optical path is asymmetrical, the measurement error is large, and high-accuracy demodulation of the measured object cannot be achieved. The optical fiber displacement sensor used only uses its linear front slope, and the measurable range is small. The scope of use is very limited
The main disadvantages are: complex optical path and high system cost

Method used

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  • Three-dimensional speckle strain measurement device and measurement method thereof
  • Three-dimensional speckle strain measurement device and measurement method thereof
  • Three-dimensional speckle strain measurement device and measurement method thereof

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Embodiment Construction

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] The present invention proposes a real-time measurement method for object deformation, such as figure 1 shown. measurement system such as figure 2 As shown, it is composed of a computer 5, a first CCD camera 1, a second CCD camera 4, a first LED lighting lamp 2 and a second LED lighting lamp 3.

[0043] When measuring the deformation of a certain workpiece, (1) speckle preparation. Speckle preparation is performed on the measurement area of ​​the material to be measured. Speckle preparation can use the texture of the material itself (such as image 3 shown), speckle preparation can also be done manually by artificial spraying (such as Figure 4 shown) or using a laser to create speckle (such as Figure 5 shown). Speckle preparation requirements: a) speckle particles should be randomly distributed; b) speckle contrast should be obvious; c) speckl...

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Abstract

The invention discloses a three-dimensional speckle strain measurement method, comprising: (1) speckle preparation; (2) camera calibration; (3) state information acquisition; (4) computational domaindesignation; (5) initial point setting; (6) speckle matching; (7) three-dimensional reconstruction; and (8) strain computation. By the above operation steps, the invention provides a three-dimensionalspeckle strain measurement method, which can effectively obtain high preciseness measurement results in measurements of material characteristic parameters such as full-field vibration measurement, dynamic strain measurement, high speed deformation measurement, fracture mechanics, impact excitation and dynamic material experiments. The invention has the characteristics of convenient measurement operation, high automation degree, exact and reliable results, high efficiency and non-contact measurement.

Description

technical field [0001] The invention belongs to the field of measurement, and relates to a strain measuring device and a measuring method thereof, in particular to a three-dimensional speckle strain measuring device and a measuring method thereof. Background technique [0002] With the development of material science and deformation measurement, there is an increasing demand for measurement of full-field vibration measurement, dynamic strain measurement, high-speed deformation measurement, fracture mechanics, impact excitation, and material characteristic parameters in dynamic material tests. The original measurement methods mainly use strain sensors, optical fiber sensors and laser interference methods for measurement. [0003] The strain sensor mainly uses the principle of strain transformation to make a resistive strain gauge or a strain film, which can feel the strain of the measured object when it is subjected to force or torque, and can convert the strain into a resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 梁晋肖振中唐正宗郭翔史宝全胡浩
Owner XI AN JIAOTONG UNIV
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