Stress measuring method based on dynamic photoelastic system

A dynamic photoelasticity and stress measurement technology, applied in the field of acoustics, can solve problems such as complex operation, and achieve the effect of simple equipment and convenient operation

Inactive Publication Date: 2016-06-15
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

Tensile specimen compensation method, quartz wedge compensation method, analyzer compensation method and photometer compensation method are commonly used ...

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  • Stress measuring method based on dynamic photoelastic system
  • Stress measuring method based on dynamic photoelastic system
  • Stress measuring method based on dynamic photoelastic system

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Embodiment Construction

[0021] The present invention will be further described below through the accompanying drawings and specific embodiments, but it should be understood that these embodiments are only used for more detailed description, and should not be construed as limiting the present invention in any form, that is, not intended To limit the protection scope of the present invention.

[0022] In one embodiment, the stress measurement method of the present invention can quickly obtain the absolute stress value. It uses a dynamic photoelastic system to first perform dark field imaging, bright field imaging, and dark field compensation field imaging on the internal sound field of the sample, and The light intensity values ​​at the stress measuring points are obtained respectively; then the phase difference is obtained according to the light intensity values ​​obtained under the three conditions; finally, the absolute stress value can be obtained through the relationship between the phase differenc...

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Abstract

The invention relates to a stress measuring method based on a dynamic photoelastic system. The method comprises that dark-field imaging is carried out, and a first light intensity value of a stress measuring point is obtained; bright field imaging is carried out, and a second light intensity value of the stress measuring point is obtained; dark compensation field imaging is carried out to obtain a third light intensity value of the stress measuring point; the phase difference of birefringence caused by stress is obtained on the basis of the first, second and third light intensity values; and on the basis of the phase difference, different stress values of the stress measuring point are calculated. A laser vibration meter is used to verify the accuracy of a result measured via the method; the measuring method which is a new rotation polarizer method is characterized by a simple optical system, simple operation and the accurate result; and the measuring method can serve as a brand new method to measure the internal stress of a transparent solid, and can be applied to small stress measurement.

Description

technical field [0001] The present application relates to the field of acoustic technology, in particular to a stress measurement method based on a dynamic photoelastic system. Background technique [0002] The dynamic photoelastic imaging system can be used to study the propagation and scattering of sound waves in solids, and it is intuitive and accurate. For example, the patent (CN103575381A): Measurement method of ultrasonic transducer sound field based on dynamic photoelasticity method, describes in detail the use of dynamic photoelasticity method to intuitively display and measure the information of ultrasonic transducer sound field in transparent solids, and utilizes the The processing of the gray-scale transient sound field image and the gray-scale steady-state sound field image can quickly and accurately obtain the sound field information of the ultrasonic transducer. But this method can only measure the relative stress, not the quantitative measurement of the absol...

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Application Information

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IPC IPC(8): G01L1/24
CPCG01L1/241
Inventor 安志武胡中韬廉国选毛捷王小民
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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