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

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外文摘要：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 simul-taneously 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 H13C14N,C2H2 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.

外文关键词：

frequency-modulated continuous-wave(FMCW)technologyoptical frequency combmultiplex-ingabsorption spectroscopy

作者：

贾琳华、曲兴华、张福民

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作者单位：

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

基金：

National Natural Science Foundation of ChinaNational Key Research and Development Program of China

项目编号：

523755462022YFF0705701

出版年：

2024

DOI：

10.1088/1674-1056/ad5980

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

年,卷(期)：2024.33(9)