歪ダイナミックレンジに制限のないブリルアン光相関領域反射計のサンプリングレートを 20 kHz まで向上させた朱君（M2）・岸澤君（M2）の共同執筆論文が IEEE Sensors Journal に掲載されました。
G. Zhu, K. Kishizawa, K. Noda, H. Lee, K. Nakamura, and Y. Mizuno, “Wide-dynamic-range Brillouin optical correlation-domain reflectometry with 20-kHz sampling rate,” IEEE Sens. J., vol. 22, no. 7, pp. 6644-6650 (2022).
Brillouin optical correlation-domain reflectometry (BOCDR) is known as one of the distributed fiber-optic strain/temperature sensing techniques. Recently, a high-speed BOCDR configuration with no measurable strain limit has been developed, but only a sampling rate of 50 Hz has been experimentally demonstrated, limited by the use of a commercial microwave frequency sweeper (MFS). In this work, by replacing the MFS with an independent voltage-controlled oscillator driven by a function generator, we experimentally show via vibration detection that this system can achieve a sampling rate of up to 20 kHz. We newly observe the systematic noise peculiar to such high-speed operation, which is found to originate from the unintended intensity modulation of the laser output. We also demonstrate the suppression of this noise by band-elimination filtering.