(Peer-Reviewed) Brillouin scattering spectrum for liquid detection and applications in oceanography
Yuanqing Wang 王元庆 ¹, Jinghao Zhang 张景豪 ², Yongchao Zheng 郑永超 ², Yangrui Xu 徐杨睿 ¹, Jiaqi Xu 许佳琪 ¹, Jiao Jiao 焦蛟 ³, Yun Su 苏云 ², Hai-Feng Lü 吕海峰 ³ ⁴, Kun Liang 梁琨 ¹
¹ School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan 430074, China
中国 武汉 华中科技大学电子信息与通信学院
² Beijing Institute of Space Mechanics and Electricity, Beijing 100076, China
中国 北京 北京空间机电研究所
³ School of Physics and School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu 610054, China
中国 成都 中国电子科技大学 物理学院 航空航天学院
⁴ State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
中国 北京 清华大学物理系 低维量子物理国家重点实验室
Opto-Electronic Advances, 2022-08-26

The Brillouin scattering spectrum has been used to investigate the properties of a liquid medium. Here, we propose an improved method based on the double-edge technique to obtain the Brillouin spectrum of a liquid.

We calculated the transmission ratios and deduced the Brillouin shift and linewidth to construct the Brillouin spectrum by extracting the Brillouin edge signal through filtered double-edge data. We built a detection system to test the performance of this method and measured the Brillouin spectrum for distilled water at different temperatures and compared it with the theoretical prediction. The observed difference between the experimental and theoretical values for Brillouin shift and linewidth is less than 4.3 MHz and 3.2 MHz, respectively.

Moreover, based on the double-edge technique, the accuracy of the extracted temperatures and salinity is approximately 0.1 °C and 0.5%, respectively, indicating significant potential for application in water detection and oceanography.
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