Hits:

Indexed by:期刊论文

Date of Publication:2011-03-31

Journal:SENSORS AND ACTUATORS B-CHEMICAL

Included Journals:SCIE、EI

Volume:153

Issue:1

Page Number:214-218

ISSN No.:0925-4005

Key Words:Fabry-Perot interferometers; Fiber pressure sensor; Phoroacoustic spectroscopy; Wavelength modulation; Acetylene

Abstract:An all-optical photoacoustic spectrometer based on the diaphragm-based extrinsic Fabry-Perot interferometer (EFPI) fiber acoustic sensor for trace gas detection at atmospheric pressure and room temperature is first developed. The diaphragm-based EFPI fiber acoustic sensor is used to replace the conventional acoustic sensor in this system. Tunable erbium-doped fiber ring laser (TEDFRL) with an erbium-doped fiber amplifier (EDFA) is used as the excitation light source for the generation of the photoacoustic (PA) signal. A first longitudinal resonant PA cell with double absorption optical path is used to improve the sensitivity of the system. The advantages of all-optical photoacoustic spectrometer are immunity to electromagnetic interference, safely in flammable and explosive situations, and long distance sensing. This system is developed for the continuous and real-time measurement of acetylene gas at room temperature and atmospheric pressure. With the wavelength modulation and lock-in harmonic detection method, the minimum detectable limit of 1.56 parts-per-billion (ppb) volume acetylene (signal-to-noise ratio. SNR = 1) at the 1530.37 nm transition line was achieved. (C) 2010 Elsevier B.V. All rights reserved.