Optical ball with acrylic cover, good transparency, no deformation.
采用亚克力光学球罩，透光性好，无变形。
2
For eliminating the errors in deformation measuring and improving the accuracy in hole-drilling method, this paper presented an optical technique, grating rosette and moire interferometry.
针对钻孔法测量残余应力方法中变形测量存在的误差，提出用光栅应变花测量钻孔所释放的残余应变。
3
A distributed optic fiber type strain sensing system based on optical time domain reflectometer and used for monitoring large scale structural strain and deformation state is studied in the paper.