Research On Glass Stress Measuring Instruments Based On Optical Polarization

Flat glass is a widely used material in the fields of daily necessities,construction,automotive,aerospace,and electronic communications.However,the temperature difference in the annealing process of the flat glass,the unevenness of the structural components,and the external force all cause stress in the glass,which leads to failure or destruction of the glass.Therefore,the detection of the internal stress of the glass is increasingly important.This can be used not only for the inspection of flat glass quality,but also for the elimination of internal stresses and for improving the performance of glass products.In this paper,research is conducted on glass stress measurement based on optical polarization.The research is divided into four parts: research background and significance,formation principle and measurement method of stress birefringence,design and implementation of stress measurement instrument,performance evaluation and application of stress measurement instrument.The details are as follows:Firstly,the classification and causes of glass stress,the purpose and significance of glass stress detection are introduced.The existing stress birefringence measurement methods and some researches on stress measurement instruments at home and abroad are introduced.Secondly,the basic theory of stress measurement and several measurement methods of stress birefringence are expounded,and the measurement principles of polarization colorimetry and single quarter wave plate measurement are described in detail.Based on the commonality of polarization colorimetry and single quarter wave plate measurement,a systematic model of two measurement methods is established.Thirdly,the optical path system of the polarization colorimetry stress instrument and the single quarter wave plate stress instrument is designed.The selection and determination of the optical device,the structural design of the three modules of the light source and the polarizing module,the dimming and detecting module and the instrument supporting component are completed.Fourthly,the performance of the stress instrument is evaluated.Semi-quantitative measurement of stress birefringence can be achieved on a polarization colorimetry stress instrument.And quantitative measurement of stress birefringence can be achieved in the single quarter wave plate stress instrument.The application research of stress measuring instrument is carried out,which mainly completed the measurement of stress birefringence of products such as mobile phone tempered film.This demonstrates the application prospects of stress measuring instruments.