Device and method for measuring stress of optical glass

Abstract

The invention provides a stress measuring device with higher precision, which can measure the size, direction and distribution of the stress of optical glass. The stress measuring device of the optical glass comprises a communicated light path interferometer and a stander, wherein the stander comprises a frame and a plane scanning test platform arranged on the frame; and a laser receiving unit and a laser emitting unit of the communicated light path interferometer are arranged on the stander, and can synchronously move front and back, and up and down. The stress measuring device achieves the quantitive measurement of the stress size and the stress uniformity of the optical glass; in addition, the precision is greatly improved, the resolution reaches 0.01nm, and the size of the measurable optical glass is greatly widened. The stress measuring device can better measure the stress optical coefficient of the optical glass; and compared with the other polarized stress meter measuring devices with weight application, the measuring precisions of the pressure and the stress of load are obviously improved, and the measuring precision of the stress optical coefficient can reach 0.03*10<-12> / Pa.

Description

technical field [0001] The invention relates to a device and method for measuring optical glass stress, in particular to a device and method for measuring optical glass stress and stress uniformity distribution with high precision. Background technique [0002] Usually, due to the uneven internal temperature of the optical glass, the original isotropic optical glass produces internal stress, showing a crystal-like birefringence phenomenon, that is, a beam of polarized light is decomposed into two beams of o light and o light whose vibration directions are perpendicular to each other. e light, and the refractive index of the two in the optical glass is also different, forming a phase difference (optical path difference) after exiting. The existence of this birefringent optical path difference shows that there is stress inside the optical glass. Excessive stress is not conducive to the cold processing of optical glass products, and this birefringent optical path difference is ...

AI Technical Summary

Problems solved by technology

[0005] The measurement of the stress distribution of optical glass is mostly qualitative measurement at present, and the polarizing stress meter can only qualitatively measure the stress distribution of small-sized optical glass; for large-diameter optical glass, although the concave mirror reflection method can increase the The method of concave mirror caliber is used to qualitatively measure the stress distribution of large-diameter optical glass, but the large-diameter concave mirror will cause the entire test light path to become very long, and it will take up a huge test space, and with the increase of the test space , the environmental interference will become more and more obvious, and the above two methods are unable or difficult to measure the stress direction and distribution of large aperture optical glass

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