光学 精密工程, 2014, 22 (1): 58, 网络出版: 2014-02-18   

磁光调制法测量玻璃内应力

Magneto-optical modulation method for measuring glass internal stress
作者单位
1 中国科学院 西安光学精密机械研究所,陕西 西安 710119
2 中国科学院大学,北京100049
摘要
提出了一种基于磁光调制法测量玻璃内应力方向和大小的方法,并建立了基于磁光调制的内应力测量系统。首先,采用光线追迹的方法,根据偏振光的琼斯矩阵描述方式推导了系统的测量模型; 采用磁光调制器,对信号光束进行正弦交变的磁光调制,将直接测量光强信号改为测量频率信号,提高了测量准确度; 采用磁旋光器,消除了人为操作引起的误差,并通过控制旋光器外加线圈驱动电流的大小,改变调制信号光偏振方向的旋转角度; 最后,对待测样品进行了多次旋转测量。测量结果显示,本方法对玻璃内应力方向的测量准确度为5″,对应力双折射的测量准确度为0.3 nm/cm。得到的结果验证了该方法的有效性和稳定性,显示系统具有稳定性高、准确度高、容易实现工程化等特点。
Abstract
A measuring method for the internal stress magnitude and direction of glass was proposed based on the magneto-optical modulation and a stress measuring system was established. On the basis of the ray-tracing method, the system's measurement model was derived according to the Jones matrix describing manner of polarized light. Then, using a magneto-optical modulator, the signal beam was modulated with a sine alternation manner and the direct measurement of the light intensity signal in the traditional method was changed into the frequency signal measurement to improve the measurement veracity greatly. Furthermore, the human operator error was eliminated through a magneto-optical rotator, and the current for driving a coil outside the rotator was controlled to change the rotation angle of modulation signal light in the polarization direction. Finally, a number of rotating measurements to the sample were carried out. The experimental results indicate that the measurement veracities for stress direction, and the stress birefringence are 5" and 0.3 nm/cm, respectively. In conclusions, the system has the characteristics of high stability, high veracity and easy to be implemented in engineering applications.

李春艳, 吴易明, 高立民, 陆卫国, 肖茂森. 磁光调制法测量玻璃内应力[J]. 光学 精密工程, 2014, 22(1): 58. LI Chun-yan, WU Yi-ming, GAO Li-min, LU Wei-guo, XIAO Mao-sen. Magneto-optical modulation method for measuring glass internal stress[J]. Optics and Precision Engineering, 2014, 22(1): 58.

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