Open AccessMultiple reflections enhanced fiber-optic photoacoustic sensor for gas micro-leakage
Author(s) -
Tianhe Yang,
Weigen Chen,
Zhixian Zhang,
Jiali Lei,
Fu Wan,
Ruimin Song
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.415607
Subject(s) - materials science , optics , leakage (economics) , optical fiber , photoacoustic spectroscopy , interferometry , fiber optic sensor , optoelectronics , wavelength , laser , physics , economics , macroeconomics
A multiple reflections-enhanced fiber-optic photoacoustic (PA) gas sensor for gas micro-leakage is introduced. Multiple reflections of the excitation laser occur on the inner surface of a reflective ring to enhance the PA signal. The PA signal is obtained by measuring the deflection of the gold-coated poly (phenylene sulfide) (PPS) diaphragm with a Fabry-Perot interferometer (FPI). The second harmonic wavelength modulation spectrum (2f-WMS) technology can essentially eliminate the fundamental frequency noise generated by the wavelength-independent absorption of the reflective ring. Experimental results show that the PA signal can be effectively enhanced 11.7 times by the multiple reflections optical path compare with the double-pass optical path. The minimum detection limit of the system is achieved to be 23.6 ppb. The designed PA gas sensor is suited for remote detection of gas micro-leakage.