Laser & Optoelectronics Progress, Volume. 60, Issue 17, 1730002(2023)
Study on Electro-Optic Dual-Comb Spectroscopy for Gas Concentration Measurement
Dual-comb spectroscopy is an important tool for performing high-resolution spectral analysis. However, its coherence depends on complex and huge frequency-locking and feedback systems. Thus, the implementation of this technique is expensive and the system is sensitive to environmental disturbances; consequently, the applications of this tool are limited. A dual-comb system based on an electro-optic frequency comb has the advantages of a simple device, frequency agility, high coherence, and conduciveness to field applications. However, its accuracy and real-time performance for concentration inversion in gas detection applications still need to be verified. Therefore, a highly coherent electro-optic dual-comb system was constructed in this study. The absorption spectra of CO and CO2 were measured by using a multipass gas cell. The results are consistent with the simulation data of the HITRAN database. The spectral resolution reaches 200 MHz, and the single refresh time is only 4 μs. The concentration uncertainty of CO2 absorption peaks is reduced to 2.86% by concentration inversion and multipeak fitting. In addition, the real-time performance of the system for monitoring the concentration of a gas mixture is verified through the rapid detection of the CO absorption spectrum. The system is expected to be applied to the real-time monitoring of the fault characteristic gases of power equipment.
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Jie Wang, Rui Liu, Wenlong Liao, Xinyi Ren, Hui Ma, Ming Yan, Heping Zeng, Qinqing Huang, Lin Cheng. Study on Electro-Optic Dual-Comb Spectroscopy for Gas Concentration Measurement[J]. Laser & Optoelectronics Progress, 2023, 60(17): 1730002
Category: Spectroscopy
Received: Jul. 17, 2022
Accepted: Sep. 5, 2022
Published Online: Sep. 13, 2023
The Author Email: Ren Xinyi (18717827913@163.com)