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0.3nm/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。
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 measure- ment veracity greatly. Furthermore, the human operator error was eliminated through a magneto-op- tical 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 measure- ments to the sample were carried out. The experimental results indicate that the measurement veraci- ties for stress sions, the system ction, and the stress birefringence are 5 has the characteristics of high stability, and 0.3 nm/cm, respectively. In conclu high veracity and easy to be implemented in engineering applications.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2014年第1期58-62,共5页
Optics and Precision Engineering
基金
国防科研基金资助项目(No.JPPT-115-3-1360)
陕西省科技计划基金资助项目(No.2011kjxx27)
关键词
偏振光
磁光调制
玻璃
内应力测量
磁旋光
polarized light
magneto-optical modulation
glass
internal stress measurement
magnetic rotation
