16 August 1996 Real-time measurement of two-dimensional birefringence
Author Affiliations +
Proceedings Volume 2873, International Symposium on Polarization Analysis and Applications to Device Technology; (1996) https://doi.org/10.1117/12.246252
Event: International Symposium on Polarization Analysis and Applications to Device Technology, 1996, Yokohama, Japan
Abstract
The photo-elastic fringe pattern measurement technique is a nondestructive method widely used to measure the mechanical stress distribution inside solid materials. The mechanical stress distribution is evaluated by generating the photo-elastic fringe pattern and counting the number of isochromatic fringes (dark lines). If the amount of the mechanical stress is very small, however, and the corresponding birefringence is smaller than t radians, no fringe lines are produced. This method is, therefore, not suitable when the amount of the mechanical stress is small. Furthermore, ii the azimuth angle of the mechanical stress is to be measured, the sample needs to be rotated. We therefore developed a highly sensitive measurement system suitable for measuring birefringence distributions smaller than 7r radians by using an electro-optical phase modulator (Pockels cell) and a two-dimensional lock-in amplifier.1 This system can also measure the azimuth angle simultaneously without rotating the sample. Here we report the principle of this two-dimensional measurement system and give the results of measuring the 2-D birefringence distribution in PMMA fixed beam.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Keigo Itoh, Keigo Itoh, Teruhisa Okhawa, Teruhisa Okhawa, Yongchang Zhu, Yongchang Zhu, Tatsuo Takada, Tatsuo Takada, Takashi Maeno, Takashi Maeno, } "Real-time measurement of two-dimensional birefringence", Proc. SPIE 2873, International Symposium on Polarization Analysis and Applications to Device Technology, (16 August 1996); doi: 10.1117/12.246252; https://doi.org/10.1117/12.246252
PROCEEDINGS
4 PAGES


SHARE
Back to Top