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Proceedings Paper

Interband cascade laser based absorption sensor for ppb-level formaldehyde detection
Author(s): Wei Ren; Longqiang Luo; Yingchun Cao; Wenzhe Jiang; Frank K. Tittel
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Paper Abstract

A trace gas absorption sensor for formaldehyde (H2CO) detection was developed using a continuous wave, room temperature, low-power consumption interband cascade laser (ICL) at 3.6 μm. The recent availability of ICLs with wavelength ranged between 3−4 μm enables the sensitive detection of trace gases such as formaldehyde that possesses a strong absorption band in this particular wavelength region. This absorption sensor detected a strong formaldehyde line at 2778.5 cm-1 in its v1 fundamental band. Wavelength modulation spectroscopy with second harmonic detection (WMS-2f) combined with a compact and novel multipass gas cell (7.6 cm physical length, 32 ml sampling volume, and 3.7 m optical path length) was utilized to achieve a sensitivity of ~6 ppbv for H2CO measurements at 1 Hz sampling rate. The Allan- Werle deviation plot reveals that a minimum detection limit of ~1.5 ppbv can be achieved for an averaging time of 140 seconds.

Paper Details

Date Published: 8 February 2015
PDF: 5 pages
Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 93702B (8 February 2015); doi: 10.1117/12.2083715
Show Author Affiliations
Wei Ren, Chinese Univ. of Hong Kong (Hong Kong, China)
Longqiang Luo, Rice Univ. (United States)
Yingchun Cao, Rice Univ. (United States)
Wenzhe Jiang, Rice Univ. (United States)
Frank K. Tittel, Rice Univ. (United States)

Published in SPIE Proceedings Vol. 9370:
Quantum Sensing and Nanophotonic Devices XII
Manijeh Razeghi; Eric Tournié; Gail J. Brown, Editor(s)

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