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Proceedings Paper

A near-infrared carbon dioxide sensor system using a compact folded optical alignment structure
Author(s): Zhiwei Liu; Chuantao Zheng; Hongtao Xie; Qiang Ren; Chen Chen; Weilin Ye; Yiding Wang; Frank K. Tittel
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Paper 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.

Paper Details

Date Published: 23 October 2018
PDF: 8 pages
Proc. SPIE 10821, Advanced Sensor Systems and Applications VIII, 108210I (23 October 2018); doi: 10.1117/12.2502445
Show Author Affiliations
Zhiwei Liu, Jilin Univ. (China)
Chuantao Zheng, Jilin Univ. (China)
Hongtao Xie, Jilin Univ. (China)
Qiang Ren, Jilin Univ. (China)
Chen Chen, Jilin Univ. (China)
Weilin Ye, Shantou Univ. (China)
Yiding Wang, Jilin Univ. (China)
Frank K. Tittel, Rice Univ. (United States)


Published in SPIE Proceedings Vol. 10821:
Advanced Sensor Systems and Applications VIII
Tiegen Liu; Shibin Jiang, Editor(s)

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