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Indexed by:期刊论文

Date of Publication:2009-11-01

Journal:SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY

Included Journals:SCIE、EI、PubMed、Scopus

Volume:74

Issue:4

Page Number:924-927

ISSN No.:1386-1425

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

Abstract: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