前方ブリルアン散乱に基づいて相関領域法により温度の分布測定を実現した論文が Japanese Journal of Applied Physics に掲載されました。光産業創成大学院大学の林特任助教が中心となって進めた共同研究の成果です。
N. Hayashi, Y. Mizuno, K. Nakamura, C. Zhang, L. Jin, S. Y. Set, and S. Yamashita, “Pilot demonstration of correlation-domain distributed temperature sensing using forward Brillouin scattering,” Jpn. J. Appl. Phys., vol. 59, no. 8, 088002 (2020).
Forward Brillouin scattering (FBS) has been regarded as a key tool for distributed sensing of strain, temperature, acoustic impedance, etc. To date, FBS-based distributed sensing has been experimentally reported only by time-domain techniques. In this paper, we demonstrate correlation-domain distributed temperature sensing using cascaded FBS seeded by backward stimulated Brillouin scattering (SBS). By localizing the backward SBS using synthesized optical coherence function, cascaded FBS can also be localized. In the proof-of-concept experiment, we detect a 104-m-long heated section in a 397-m-long highly nonlinear fiber.