Compact photoacoustic module for methane detection incorporating interband cascade light emitting device

Abstract

A photoacoustic module (PAM) for methane detection was developed by combining a novel 3.2 μm 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 ~700 μW. 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 1σ detection limit of 3.6 ppmv was achieved with a 1-s integration time.

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Zheng, Huadan, Lou, Minhan, Dong, Lei, et al.. "Compact photoacoustic module for methane detection incorporating interband cascade light emitting device." Optics Express, 25, no. 14 (2017) The Optical Society: 16761-16770. https://doi.org/10.1364/OE.25.016761.

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