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23 October 2018 A near-infrared carbon dioxide sensor system using a compact folded optical alignment structure
Zhiwei Liu, Chuantao Zheng, Hongtao Xie, Qiang Ren, Chen Chen, Weilin Ye, Yiding Wang, Frank K. Tittel
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Proceedings Volume 10821, Advanced Sensor Systems and Applications VIII; 108210I (2018) https://doi.org/10.1117/12.2502445
Event: SPIE/COS Photonics Asia, 2018, Beijing, China
Abstract
A compact optical alignment structure and a novel beam-tracing method were proposed for tunable laser absorption spectroscopy (TLAS) based gas measurements, in order to minimize sensor size and ease beam alignment procedure. A near-infrared carbon dioxide (CO2) sensor system was developed based on the alignment structure. A distributed feedback (DFB) laser centered at 6361.3 cm-1 and a multi-pass gas cell (MPGC) with an effective optical path length of 29.8 m were employed. The sensor system was integrated as standalone equipment by customizing an aluminum baseplate for a stable field operation. A series of experiments were carried out to assess the performance of the sensor system. A limit of detection (LoD) of ~ 7.1 parts-per-million in volume (ppmv) at a 0.4 s averaging time was obtained, and the LoD was reduced to ~ 277 parts-per-billion in volume (ppbv) at an optimum averaging time of 153.6 s. Considering gas mixing times, the rise and fall time were measured to be ~ 290 s and ~ 200 s, respectively.
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Zhiwei Liu, Chuantao Zheng, Hongtao Xie, Qiang Ren, Chen Chen, Weilin Ye, Yiding Wang, and Frank K. Tittel "A near-infrared carbon dioxide sensor system using a compact folded optical alignment structure", Proc. SPIE 10821, Advanced Sensor Systems and Applications VIII, 108210I (23 October 2018); https://doi.org/10.1117/12.2502445
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KEYWORDS
Carbon dioxide
Gas sensors
Near infrared spectroscopy
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