Yin, XukunDong, LeiWu, HongpengMa, WeiguangZhang, LeiYin, WangbaoXiao, LiantuanJia, SuotangTittel, Frank K.2017-08-112017-08-112017Yin, Xukun, Dong, Lei, Wu, Hongpeng, et al.. "Ppb-level H2S detection for SF6 decomposition based on a fiber-amplified telecommunication diode laser and a background-gas-induced high-Q photoacoustic cell." <i>Applied Physics Letters,</i> 111, no. 3 (2017) AIP Publishing: http://dx.doi.org/10.1063/1.4987008.https://hdl.handle.net/1911/96647A ppb-level hydrogen sulfide (H2S) gas sensor for sulfur hexafluoride (SF6) decomposition analysis was developed by means of a background-gas-induced high-Q differential photoacoustic cell (PAC) and a fiber-amplified telecommunication diode laser. The watt-level excitation laser power compensates the sensitivity loss as a result of using a low cost, near-IR laser source. The differential design with a large cylindrical resonator diameter allows the PAC to accommodate the high power beam and maintain a low noise level output. The theory of background-gas-induced high-Q PAC is provided and was verified experimentally. A H2S detection limit (1σ) of 109 ppb in a SF6 buffer gas was achieved for an averaging time of 1 s, which corresponds to a normalized noise equivalent absorption coefficient of 2.9 × 10−9 cm−1 W Hz−1/2.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 articlehttp://dx.doi.org/10.1063/1.4987008