Journal
APPLIED PHYSICS LETTERS
Volume 111, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4987008
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Funding
- National Key R&D Program of China [2017YFA0304203]
- National Natural Science Foundation of China [61622503, 61575113, 11434007]
- Changjiang Scholars and Innovative Research Team in the University of Ministry of Education of China [IRT13076]
- National Science Foundation (NSF) ERC MIRTHE award
- Robert Welch Foundation [C-0586]
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A 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 (1 sigma) 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 x 10(-9) cm(-1) WHz(-1/2). Published by AIP Publishing.
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