Abstract
The detection of dissolved gases in seawater plays an important role in ocean observation and exploration. As a potential technique for oceanic applications, Raman spectroscopy has already proved its advantages in the simultaneous detection of multiple species during previous deep-sea explorations. Due to the low sensitivity of conventional Raman measurements, there have been many reports of Raman applications on direct seawater detection in high-concentration areas, but few on undersea dissolved gas detection. In this work, we have presented a highly sensitive Raman spectroscopy (HSRS) system with a special designed gas chamber for small amounts of underwater gas extraction. Systematic experiments have been carried out for system evaluation, and the results have shown that the Raman signals obtained by the innovation of a near-concentric cavity was about 21 times stronger than those of conventional side-scattering Raman measurements. Based on this system, we have achieved a low limit of detection of 2.32 and for and , respectively, in the lab. A test-out experiment has also been accomplished with a gas-liquid separator coupled to the Raman system, and signals of and were detected after 1 h of degasification. This system may show potential for gas detection in water, and further work would be done for the improvement of in situ detection.
© 2016 Optical Society of America
Full Article | PDF ArticleMore Like This
Jinjia Guo, Wangquan Ye, Qingsheng Liu, Fujun Qi, Kai Cheng, Dewang Yang, and Ronger Zheng
Appl. Opt. 58(10) 2630-2634 (2019)
Anlan Yu, Duluo Zuo, Bin Li, Jun Gao, and Xinbing Wang
Appl. Opt. 55(13) 3650-3655 (2016)
Jianxin Wang, Weigen Chen, Pinyi Wang, Zhixian Zhang, Fu Wan, Feng Zhou, Ruimin Song, Yingying Wang, and Shoufei Gao
Opt. Express 29(20) 32296-32311 (2021)