Ppb‐level CO2 sensor based on a miniature multipass cell with eight‐petaled spot pattern

This paper presents an innovative carbon dioxide sensor leveraging a dense‐pattern multipass absorption cell. This novel design dramatically compacts an extensive optical path of approximately 11.4 m into a 70 mm inter‐mirror distance, effectively enhancing the system's sensitivity and reducing...

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Bibliographic Details
Published in:Microwave and optical technology letters 2024-04, Vol.66 (4), p.n/a
Main Authors: Wang, Chenglong, Lin, Leqing, Zeng, Xiangyu, Xie, Jiabao, Luo, Huijian, Lin, Haoyang, Wang, Lihao, Tang, Jieyuan, Cui, Ruyue, Zhu, Wenguo, Zhong, Yongchun, Yu, Jianhui, Dong, Lei, Wu, Hongpeng, Zheng, Huadan
Format: Article
Language:English
Subjects:
Absorption
Carbon dioxide
Compacts
gas sensor
Kalman filters
multipass cell
Semiconductor lasers
Sensitivity enhancement
tuneable diode laser absorption spectroscopy
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Summary:This paper presents an innovative carbon dioxide sensor leveraging a dense‐pattern multipass absorption cell. This novel design dramatically compacts an extensive optical path of approximately 11.4 m into a 70 mm inter‐mirror distance, effectively enhancing the system's sensitivity and reducing its size. Utilizing a 2004 nm diode laser, the sensor accurately targets a potent CO2 absorption line at 4989.9 cm−1. Experimental validation reveals remarkable linearity (R² = .999) and a detection limit of 59 ppb with 1 s integration time. The incorporation of Kalman filtering techniques further refines the sensor's performance, reducing the detection limit to 30 ppb—a substantial improvement of 49%. This advancement in sensor technology marks a significant step forward in efficient and precise CO2 monitoring.
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.34118