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Measurement method of three-dimensional speckle strain measurement device

A strain measurement and measurement method technology, applied in the field of measurement, can solve the problems of inability to respond to field deformation, high system cost, complex optical path, etc., and achieve the effects of fully automatic calculation, simple system requirements, and high measurement accuracy.

Active Publication Date: 2011-02-09
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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  • Measurement method of three-dimensional speckle strain measurement device
  • Measurement method of three-dimensional speckle strain measurement device
  • Measurement method of three-dimensional speckle strain measurement device

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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 of object deformation, such as figure 1 shown. measurement systems such as figure 2 As shown, it consists 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 a certain workpiece deformation, (1) speckle preparation. Speckle preparation is performed on the measurement area of ​​the material to be measured. Speckle can be prepared by using the texture of the material itself (such as image 3 shown), speckle preparation can also be done manually by using manual spray painting (e.g. Figure 4 shown) or use a laser to prepare speckle (eg Figure 5 shown). Speckle preparation requirements: a) The speckle particles should be randomly distributed; b) The speckle contrast should be obvious; c) ...

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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 domain designation; (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-dimensional speckle 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 measurement device and a measurement method thereof, in particular to a three-dimensional speckle strain measurement device and a measurement method thereof. Background technique [0002] With the development of material science and deformation measurement, the measurement requirements for the measurement of material characteristics in the full-field vibration measurement, dynamic strain measurement, high-speed deformation measurement, fracture mechanics, impact excitation and dynamic material testing of materials are getting higher and higher. The original measurement methods mainly use strain sensors, optical fiber sensors and laser interference methods for measurement. [0003] The strain sensor mainly uses the strain transformation principle to make a resistive strain gauge or strain film. It can sense the strain of the measuring object when it is subjected to force or torqu...

Claims

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Application Information

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Patent Type & Authority Patents(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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