Abstract

Raman spectroscopy is a powerful method of probing natural gas components, but higher sensitivity, greater miniaturization, and lower cost techniques are required. Therefore, we designed a Raman integrating sphere-enhanced spectroscopy technology in a volume of 40 × 40 × 20 cm³ based on the principle of integrating sphere reflection. This technology consists of two parts: the first is an integrating sphere model to collect scattered signals, and the second is a right-angle light-boosting system to increase the optical path of the pump light in the sample. Raman integrating sphere technology has a detection limit of 0.5 ppm in the air with an exposure time of 600 s under room temperature and ambient pressure conditions. Experiments of natural gas detection display that the detection limits of ethane, propane, n-butane, isobutane, n-pentane, and isopentane are 28, 28, 95, 28, 189, and 95 ppm, respectively. In addition, there is a linear relationship between the relative Raman intensity and the concentration of each component in natural gas, which can be used as a probe for detecting unknown natural gas components in gas wells.

© 2023 Optica Publishing Group

Differential integrating sphere-based photoacoustic spectroscopy gas sensing

Chu Zhang, Ying He, Shunda Qiao, and Yufei Ma
Opt. Lett. 48(19) 5089-5092 (2023)

Pump–probe-alternating photothermal interferometry for two-component gas sensing

Linhao Guo, Pengcheng Zhao, Hoi Lut Ho, Shoulin Jiang, Haihong Bao, Shoufei Gao, Yingying Wang, and Wei Jin
Opt. Lett. 48(24) 6440-6443 (2023)

Simple technique of coupling a diode laser into a linear power buildup cavity for Raman gas sensing

Hu Ge, Weipin Kong, Rui Wang, Gang Zhao, Weiguang Ma, Weigen Chen, and Fu Wan
Opt. Lett. 48(8) 2186-2189 (2023)

Development of a two-beveled-fiber polarized fiber-optic Raman probe coupled with a ball lens for in vivo superficial epithelial Raman measurements in endoscopy

Jianfeng Wang, Shuyu Chen, Ruoyu Zhang, Kan Lin, Tao Wang, Wenxiang Liu, and AiJun Zhang
Opt. Lett. 48(18) 4885-4888 (2023)

Enhanced second-harmonic generation in strained germanium-on-insulator microdisks for integrated quantum photonic technologies

James Tan, Xuncheng Shi, Kunze Lu, Hyo-Jun Joo, Youngmin Kim, Melvina Chen, Lin Zhang, Chuan Seng Tan, Khee Yong Lim, Elgin Quek, and Donguk Nam
Opt. Lett. 48(16) 4269-4271 (2023)