Zheng, HuadanLou, MinhanDong, LeiWu, HongpengYe, WeilinYin, XukunKim, Chul SooKim, MijinBewley, William W.Merritt, Charles D.Canedy, Chadwick L.Warren, Michael V.Vurgaftman, IgorMeyer, Jerry R.Tittel, Frank K.2017-08-092017-08-092017Zheng, Huadan, Lou, Minhan, Dong, Lei, et al.. "Compact photoacoustic module for methane detection incorporating interband cascade light emitting device." <i>Optics Express,</i> 25, no. 14 (2017) The Optical Society: 16761-16770. https://doi.org/10.1364/OE.25.016761.https://hdl.handle.net/1911/96629A 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.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articleCompact_photoacoustic_modulehttps://doi.org/10.1364/OE.25.016761