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Date of Publication:2009-01-01

Journal:中国激光

Issue:4

Page Number:964-967

ISSN No.:0258-7025

Abstract:The technology of photoacoustic spectrum has features of high sensitivity, continuous and fast in situ measurement in detecting acetylene in low concentration. A new wavelength modulated photoacoustic spectrometer based on a near-infrared tunable erbium doped fiber laser (TEDFL) and a high power erbium doped fiber amplifier (EDFA) is developed. This system is demonstrated with low concentration acetylene measurement at the 1530.37 nm transition line, by incorporation of a first-longitudinal resonant photoacoustic cell with double absorption optical path and lock-in harmonic detection technique, yielding a detection limit of 1.3×10-9at room temperature and atmospheric pressure and this can meet the demands of acetylene detection and analysis in industry, environment monitoring and power system.

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