ブリルアン光相関領域反射計 (BOCDR) におけるレーザの温度の影響を解明した東京工業大学・横浜国立大学との共同研究の成果が Applied Physics Express に掲載されました。
Y. Mizuno, N. Motoishi, K. Noda, H. Lee, and K. Nakamura, “Effect of laser temperature control on Brillouin optical correlation-domain reflectometry,” Appl. Phys. Express, vol. 13, no. 5, 052001 (2020).
We show that 1 °C drift of laser temperature yields a strain error of ~8 με in Brillouin optical correlation-domain reflectometry. Under the assumption that the strain measurement accuracy is +/–20 με (severe requirement), +/–2.5 °C drift of the laser temperature can be permitted for proper system operation. We prove this prediction by performing distributed strain measurements at different laser temperatures. Our results indicate that, if we allow a strain measurement accuracy of approximately +/–100 με (or more), we can even remove the thermal control of the laser, leading to cost reduction and downsizing of the system.