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论文类型：期刊论文

发表时间：2009-11-01

发表刊物：SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY

收录刊物：SCIE、EI、PubMed、Scopus

卷号：74

期号：4

页面范围：924-927

ISSN号：1386-1425

关键字：Wavelength modulation photoacoustic spectroscopy; Tunable fiber laser; Fiber amplifier; Resonant photoacoustic cell; Harmonic detection; Ammonia

摘要：A new wavelength modulated photoacoustic spectrometer based on a near-infrared tunable erbium doped fiber laser (TEDFL) and an erbium doped fiber amplifier (EDFA) is first developed for trace gas detection This sensor has been applied to the detection of ammonia using a first longitudinal resonant photoacoustic cell with double absorption optical path (L = 20 cm) and lock-in harmonic detection technique. The minimum detectable limit of 3 parts-per-billion Volume (signal-to-noise ratio = 1) and response time of approximately 1 min is achieved at room temperature and atmospheric pressure with 100 ms time constant and 500 mW optical power at the 1531.7 nm transition line. (C) 2009 Elsevier B.V. All rights reserved