Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 160, Issue 1, Pages 389-398Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.07.067
Keywords
Mid-infrared (MIR); Gas detection; Asymmetric ellipsoid gas-cell; Detection sensitivity; Detection error
Funding
- Science and Technology Council of China [2007AA06Z112, 2007AA03Z446, 2009AA03Z442]
- National Natural Science Foundation of China [61077074]
- Science and Technology Department of Jilin Province of China [20070709, 20090422]
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A mid-infrared (MIR) CH4 sensor was experimentally demonstrated by employing an asymmetric ellipsoid multi-pass gas-cell. Novel theory and formulas were proposed for optimizing the gas-cell structure, and both hardware and algorithm were designed to determine the accurate characteristics by reducing effect of reference voltage-fluctuation of analog-to-digital converter (ADC). The CH4 sensor was fabricated and experiments were carried out to obtain its performance. The absolute detection error is less than 5%. The minimum detection level (MDL) and the detection sensitivity are determined to be about 5 and 6-7 ppm, respectively, under the low concentration of less than 1000 ppm. The response time is measured to be within the range of 5-6 s, and the Allan variation plot shows that the system possesses acceptable stability over long term operation. Compared to our two previous reported detection devices with symmetric ellipsoid gas-cell and without reducing voltage-fluctuation, this sensor exhibits enhanced performances including higher detection sensitivity, lower MDL and shorter response time. (C) 2011 Elsevier By. All rights reserved.
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