A Calibration Device for Stress Optical Coefficient of Transparent Material

Abstract

The invention relates to a calibration device for the stress optical coefficient of a transparent material, which belongs to the technical field of material detection and solves the problems of the existing calibration device being complex, limited in use scenarios and large in calibration error. The device includes: a tension mechanism for applying axial tension of different sizes to the transparent material standard piece to be tested; a test optical path mechanism for receiving the visible light beam, and obtaining the background light intensity of the test environment, the visible light beam incident time The light intensity of the outgoing light of different wavelengths within the corresponding preset waveband range and the light intensity of the outgoing light within the corresponding preset waveband range when the standard piece of transparent material to be detected is under different axial tensions; the processor is used to The parameters use the numerical fitting method to obtain the mapping relationship between the internal stress and the optical path difference of the standard transparent material to be detected, and then calibrate the stress optical coefficient of the standard transparent material to be detected. The device has a simple structure, is not limited by the environment, and has high calibration accuracy. high.

Description

technical field [0001] The invention relates to the technical field of material detection, in particular to a calibration device for stress optical coefficients of transparent materials. Background technique [0002] Among the factors affecting the quality of materials and the life of structures, the factor of stress plays a crucial role. The internal stress of a material refers to the stress that still exists in the material and maintains self-equilibrium after the external action is eliminated, also known as the residual stress. The internal stress in the material is generally divided into thermal stress, structural stress and mechanical stress according to the source. These stresses will cause the material to warp or twist, crack, and even cause the material to fail. The detection of material stress can reflect the state of the material itself And potential problems, so it has very important research and application significance. The stress optical coefficient of the ma...

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Problems solved by technology

[0005] In view of the above analysis, the embodiment of the present invention aims to provide a calibration device for the optical coefficient of stress of transparent materials to solve the problems in the prior art that the calibration device for the optical coefficient of material stress is complicated, the use scenarios are limited, and the calibration error is large

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