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Proceedings Paper

Quantum cascade laser-based sensor system for nitric oxide detection
Author(s): Frank K. Tittel; James J. Allred; Yingchun Cao; Nancy P. Sanchez; Wei Ren; Wenzhe Jiang; Dongfang Jiang; Robert J. Griffin
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Paper Abstract

Sensitive detection of nitric oxide (NO) at ppbv concentration levels has an important impact in diverse fields of applications including environmental monitoring, industrial process control and medical diagnostics. For example, NO can be used as a biomarker of asthma and inflammatory lung diseases such as chronic obstructive pulmonary disease. Trace gas sensor systems capable of high sensitivity require the targeting of strong rotational-vibrational bands in the mid-IR spectral range. These bands are accessible using state-of-the-art high heat load (HHL) packaged, continuous wave (CW), distributed feedback (DFB) quantum cascade lasers (QCLs). Quartz-enhanced photoacoustic spectroscopy (QEPAS) permits the design of fast, sensitive, selective, and compact sensor systems. A QEPAS sensor was developed employing a room-temperature CW DFB-QCL emitting at 5.26 μm with an optical excitation power of 60 mW. High sensitivity is achieved by targeting a NO absorption line at 1900.08 cm-1 free of interference by H2O and CO2. The minimum detection limit of the sensor is 7.5 and 1 ppbv of NO with 1and 100 second averaging time respectively . The sensitivity of the sensor system is sufficient for detecting NO in exhaled human breath, with typical concentration levels ranging from 24.0 ppbv to 54.0 ppbv.

Paper Details

Date Published: 8 February 2015
PDF: 7 pages
Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 93700V (8 February 2015); doi: 10.1117/12.2083718
Show Author Affiliations
Frank K. Tittel, Rice Univ. (United States)
James J. Allred, Rice Univ. (United States)
Yingchun Cao, Rice Univ. (United States)
Nancy P. Sanchez, Rice Univ. (United States)
Wei Ren, Chinese Univ. of Hong Kong (Hong Kong, China)
Wenzhe Jiang, Rice Univ. (United States)
Dongfang Jiang, Rice Univ. (United States)
Robert J. Griffin, 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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