Frequency-modulated continuous-wave multiplexed gas sensing based on optical frequency comb calibration

doi:10.1088/1674-1056/ad5980

中国物理B ›› 2024, Vol. 33 ›› Issue (9): 94201-094201.doi: 10.1088/1674-1056/ad5980

所属专题： Featured Column — INSTRUMENTATION AND MEASUREMENT

Frequency-modulated continuous-wave multiplexed gas sensing based on optical frequency comb calibration

Linhua Jia(贾琳华), Xinghua Qu(曲兴华), and Fumin Zhang (张福民)†

State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China

收稿日期:2024-05-17 修回日期:2024-06-06 接受日期:2024-06-19 出版日期:2024-09-15 发布日期:2024-08-15
通讯作者: Fumin Zhang E-mail:zhangfumin@tju.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 52375546) and the National Key Research and Development Program of China (Grant No. 2022YFF0705701).

Frequency-modulated continuous-wave multiplexed gas sensing based on optical frequency comb calibration

Linhua Jia(贾琳华), Xinghua Qu(曲兴华), and Fumin Zhang (张福民)†

State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China

Received:2024-05-17 Revised:2024-06-06 Accepted:2024-06-19 Online:2024-09-15 Published:2024-08-15
Contact: Fumin Zhang E-mail:zhangfumin@tju.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 52375546) and the National Key Research and Development Program of China (Grant No. 2022YFF0705701).

摘要/Abstract

摘要： Laser absorption spectroscopy has proven to be an effective approach for gas sensing, which plays an important role in the fields of military, industry, medicine and basic research. This paper presents a multiplexed gas sensing system based on optical frequency comb (OFC) calibrated frequency-modulated continuous-wave (FMCW) tuning nonlinearity. The system can be used for multi-parameter synchronous measurement of gas absorption spectrum and multiplexed optical path. Multi-channel parallel detection is realized by combining wavelength division multiplexing (WDM) and frequency division multiplexing (FDM) techniques. By introducing nonlinear optical crystals, broadband spectrum detection is simultaneously achieved over a bandwidth of hundreds of nanometers. An OFC with ultra-high frequency stability is used as the frequency calibration source, which guarantees the measurement accuracy. The test samples involve H$^{13}$C$^{14}$N, C$_{2}$H$_{2}$ and Rb vapor cells of varying densities and 5 parallel measurement experiments are designed. The results show that the measurement accuracies of spectral absorption line and the optical path are 150 MHz and 20 μm, respectively. The scheme offers the advantages of multiplexed, multi-parameter, wide spectrum and high resolution detection, which can realize the identification of multi-gas components and the high-precision inversion of absorption lines under different environments. The proposed sensor demonstrates great potential in the field of high-resolution absorption spectrum measurement for gas sensing applications.

关键词: frequency-modulated continuous-wave (FMCW) technology, optical frequency comb, multiplexing, absorption spectroscopy

Abstract: Laser absorption spectroscopy has proven to be an effective approach for gas sensing, which plays an important role in the fields of military, industry, medicine and basic research. This paper presents a multiplexed gas sensing system based on optical frequency comb (OFC) calibrated frequency-modulated continuous-wave (FMCW) tuning nonlinearity. The system can be used for multi-parameter synchronous measurement of gas absorption spectrum and multiplexed optical path. Multi-channel parallel detection is realized by combining wavelength division multiplexing (WDM) and frequency division multiplexing (FDM) techniques. By introducing nonlinear optical crystals, broadband spectrum detection is simultaneously achieved over a bandwidth of hundreds of nanometers. An OFC with ultra-high frequency stability is used as the frequency calibration source, which guarantees the measurement accuracy. The test samples involve H$^{13}$C$^{14}$N, C$_{2}$H$_{2}$ and Rb vapor cells of varying densities and 5 parallel measurement experiments are designed. The results show that the measurement accuracies of spectral absorption line and the optical path are 150 MHz and 20 μm, respectively. The scheme offers the advantages of multiplexed, multi-parameter, wide spectrum and high resolution detection, which can realize the identification of multi-gas components and the high-precision inversion of absorption lines under different environments. The proposed sensor demonstrates great potential in the field of high-resolution absorption spectrum measurement for gas sensing applications.

Key words: frequency-modulated continuous-wave (FMCW) technology, optical frequency comb, multiplexing, absorption spectroscopy

中图分类号: (Optical system design)

42.15.Eq

06.20.-f (Metrology) 42.62.Fi (Laser spectroscopy) 42.62.-b (Laser applications)

Linhua Jia(贾琳华), Xinghua Qu(曲兴华), and Fumin Zhang (张福民). Frequency-modulated continuous-wave multiplexed gas sensing based on optical frequency comb calibration[J]. 中国物理B, 2024, 33(9): 94201-094201.

Linhua Jia(贾琳华), Xinghua Qu(曲兴华), and Fumin Zhang (张福民). Frequency-modulated continuous-wave multiplexed gas sensing based on optical frequency comb calibration[J]. Chin. Phys. B, 2024, 33(9): 94201-094201.

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Frequency-modulated continuous-wave multiplexed gas sensing based on optical frequency comb calibration

Frequency-modulated continuous-wave multiplexed gas sensing based on optical frequency comb calibration

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