Dong, MingZheng, ChuantaoYao, DanZhong, GuoqiangMiao, ShuzhuoYe, WeilinWang, YidingTittel, Frank K.2018-08-212018-08-212018Dong, Ming, Zheng, Chuantao, Yao, Dan, et al.. "Double-range near-infrared acetylene detection using a dual spot-ring Herriott cell (DSR-HC)." <i>Optics Express,</i> 26, no. 9 (2018) Optical Society of America: 12081-12091. https://doi.org/10.1364/OE.26.012081.https://hdl.handle.net/1911/102487Design and fabrication of a dual spot-ring Herriott cell (DSR-HC) were proposed. The sealed Herriott cell with a dimensional size of 5.5 cm × 9.2 cm × 32.1 cm, possessed two input/output coupling holes leading to two absorption path lengths of ~20 m and ~6 m, respectively. An acetylene (C2H2) sensor system with a double-range was developed using the DSR-HC and wavelength modulation spectroscopy (WMS) technique. A near-infrared distributed feedback (DFB) laser was employed for targeting a C2H2 absorption line at 6521.2 cm-1. C2H2concentration measurements were carried out by modulating the laser at a 5 kHz frequency and demodulating the detector signal with LabVIEW software. An Allan-Werle deviation analysis indicated that the limit of detection (LoD) for the two absorption path lengths of 20 m and 6 m are 7.9 parts-per-million in volume (ppmv) and 4.0 ppmv, respectively. The DSR-HC concept can be used to fabricate similar cells for single-gas detection requiring two different detection ranges as well as for dual-gas detection requiring different absorption path lengths.engAn OSA-formatted open access journal article PDF may be governed by the OSA Open Access Publishing Agreement signed by the author and any applicable copyright laws. Authors and readers may use, reuse, and build upon the article, or use it for text or data mining without asking prior permission from the publisher or the Author(s), as long as the purpose is non-commercial and appropriate attribution is maintained.Journal articleoe-26-9-12081https://doi.org/10.1364/OE.26.012081