期刊
SENSORS
卷 20, 期 14, 页码 -出版社
MDPI
DOI: 10.3390/s20143813
关键词
antiresonant hollow core fibers; microstructured fibers; laser spectroscopy; wavelength modulation spectroscopy; fiber gas sensors; fiber optics
资金
- Narodowe Centrum Nauki (NCN) [UMO-2018/30/Q/ST3/00809]
- Polish National Agency for Academic Exchange [PPI/APM/2018/1/00031/U/001]
- National Natural Science Foundation of China (NSFC) [61961136003]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) [ZDBS-LY-JSC020]
- Pioneer Hundred Talents Program of CAS
In this work, we present for the first time a laser-based dual gas sensor utilizing a silica-based Antiresonant Hollow-Core Fiber (ARHCF) operating in the Near- and Mid-Infrared spectral region. A 1-m-long fiber with an 84-mu m diameter air-core was implemented as a low-volume absorption cell in a sensor configuration utilizing the simple and well-known Wavelength Modulation Spectroscopy (WMS) method. The fiber was filled with a mixture of methane (CH4) and carbon dioxide (CO2), and a simultaneous detection of both gases was demonstrated targeting their transitions at 3.334 mu m and 1.574 mu m, respectively. Due to excellent guidance properties of the fiber and low background noise, the proposed sensor reached a detection limit down to 24 parts-per-billion by volume for CH(4)and 144 parts-per-million by volume for CO2. The obtained results confirm the suitability of ARHCF for efficient use in gas sensing applications for over a broad spectral range. Thanks to the demonstrated low loss, such fibers with lengths of over one meter can be used for increasing the laser-gas molecules interaction path, substituting bulk optics-based multipass cells, while delivering required flexibility, compactness, reliability and enhancement in the sensor's sensitivity.
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