Journal
OPTICS EXPRESS
Volume 25, Issue 14, Pages 16761-16770Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.016761
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Funding
- National Natural Science Foundation of China [61622503, 61575113, 11434007]
- National Key Research and Development Program of China [2017YFA0304203]
- Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China [IRT13076]
- Shanxi Scholarship Council of China [0011]
- National Science Foundation (NSF) ERC MIRTHE award
- Robert Welch Foundation [C-0586]
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A photoacoustic module (PAM) for methane detection was developed by combining a novel 3.2 mu m interband cascade light emitting device (ICLED) with a compact differential photoacoustic cell. The ICLED with a 22-stage interband cascade active core emitted a collimated power of similar to 700 mu W. A concave Al-coat reflector was positioned adjacent to the photoacoustic cell to enhance the gas absorption length. Assembly of the ICLED and reflector with the photoacoustic cell resulted in a robust and portable PAM without any moving parts. The PAM performance was evaluated in terms of operating pressure, sensitivity and linearity. A 1 sigma detection limit of 3.6 ppmv was achieved with a 1-s integration time. (C) 2017 Optical Society of America
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