Journal
INFRARED PHYSICS & TECHNOLOGY
Volume 92, Issue -, Pages 84-89Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.infrared.2018.05.007
Keywords
Fire detection; Near-infrared; Carbon monoxide; Distribution feedback (DFB) laser; Wavelength modulation spectroscopy (WMS)
Categories
Funding
- National Natural Science Foundation of China [61775079, 61627823, 61307124]
- National Key R&D Program of China [2016YFD0700101, 2016YFC0303902, 2017YFB0402800]
- Key Science and Technology R&D Program of Jilin Province, China [20180201046GX]
- Science and Technology Planning Project of Guangdong Province, China [2017A020216011]
- Industrial Innovation Program of Jilin Province, China [2017C027]
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We report the development of a distribution feedback (DFB) laser sensor for high precision and high sensitivity detection of the early fire gas carbon monoxide (CO). This system relied on a continuous wave (CW), distributed feedback laser emitting at a wavelength of around 2.33 pm as excitation source. A 2f/1f wavelength modulation spectroscopy (WMS) strategy was adopted to isolate complex, overlapping spectral absorption features typical of ambient pressures and to achieve excellent specificity and high detection sensitivity. Allan-Werle deviation analysis was used to evaluate the long-term performance of the CO sensor system, and limit of detection (LoD) of 1.18 parts per million by volume (ppmv) was achieved while a measurement precision of 0.08 ppmv was observed with an optimal integration time of similar to 205-s. As a field measurement, early fire detection of paper, cotton and pine wood were conducted, which verified the reliable and robust operation of the developed sensor.
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