Gas detection with evanescent-wave quartz-enhanced photoacoustic spectroscopy

Yingchun Cao; Wei Jin; Hoi Lut Ho

doi:10.1117/12.915786

Gas detection with evanescent-wave quartz-enhanced photoacoustic spectroscopy

Yingchun Cao, Wei Jin, Hoi Lut Ho

The Hong Kong Polytechnic University

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-review

4 Citations (Scopus)

Abstract

Evanescent-wave gas sensing with tapered optical fibers (TOFs) and quartz-enhanced photoacoustic spectroscopy (QEPAS) is reported. The evanescent field of TOFs with diameter down to sub-wavelength is utilized for photoacoustic excitation in photoacoustic spectroscopy. A quartz tuning fork (QTF) with resonant frequency about ~32.75 kHz is used to detect the generated pressure wave. A normalized noise equivalent absorption coefficient of 1.5×10-6cm-1W/√Hz is achieved for acetylene detection with a fiber taper with a waist diameter of 1.1 μm. It is found that QEPAS with TOFs of sub-wavelength diameters exhibit comparable sensitivities with open path QEPAS but with additional advantages of lower insertion loss, easier alignment, and multiplexing capability.

Original language	English
Title of host publication	Third Asia Pacific Optical Sensors Conference
Volume	8351
DOIs	https://doi.org/10.1117/12.915786
Publication status	Published - 20 Feb 2012
Event	3rd Asia Pacific Optical Sensors Conference - Sydney, NSW, Australia Duration: 31 Jan 2012 → 3 Feb 2012

Conference

Conference	3rd Asia Pacific Optical Sensors Conference
Country/Territory	Australia
City	Sydney, NSW
Period	31/01/12 → 3/02/12

Keywords

evanescent field
gas sensor
Optical fiber sensor
photoacoustic spectroscopy
tapered optical fiber

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

More information

10.1117/12.915786

Cite this

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title = "Gas detection with evanescent-wave quartz-enhanced photoacoustic spectroscopy",

abstract = "Evanescent-wave gas sensing with tapered optical fibers (TOFs) and quartz-enhanced photoacoustic spectroscopy (QEPAS) is reported. The evanescent field of TOFs with diameter down to sub-wavelength is utilized for photoacoustic excitation in photoacoustic spectroscopy. A quartz tuning fork (QTF) with resonant frequency about ~32.75 kHz is used to detect the generated pressure wave. A normalized noise equivalent absorption coefficient of 1.5×10-6cm-1W/√Hz is achieved for acetylene detection with a fiber taper with a waist diameter of 1.1 μm. It is found that QEPAS with TOFs of sub-wavelength diameters exhibit comparable sensitivities with open path QEPAS but with additional advantages of lower insertion loss, easier alignment, and multiplexing capability.",

keywords = "evanescent field, gas sensor, Optical fiber sensor, photoacoustic spectroscopy, tapered optical fiber",

author = "Yingchun Cao and Wei Jin and Ho, {Hoi Lut}",

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doi = "10.1117/12.915786",

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AU - Cao, Yingchun

AU - Jin, Wei

AU - Ho, Hoi Lut

PY - 2012/2/20

Y1 - 2012/2/20

N2 - Evanescent-wave gas sensing with tapered optical fibers (TOFs) and quartz-enhanced photoacoustic spectroscopy (QEPAS) is reported. The evanescent field of TOFs with diameter down to sub-wavelength is utilized for photoacoustic excitation in photoacoustic spectroscopy. A quartz tuning fork (QTF) with resonant frequency about ~32.75 kHz is used to detect the generated pressure wave. A normalized noise equivalent absorption coefficient of 1.5×10-6cm-1W/√Hz is achieved for acetylene detection with a fiber taper with a waist diameter of 1.1 μm. It is found that QEPAS with TOFs of sub-wavelength diameters exhibit comparable sensitivities with open path QEPAS but with additional advantages of lower insertion loss, easier alignment, and multiplexing capability.

AB - Evanescent-wave gas sensing with tapered optical fibers (TOFs) and quartz-enhanced photoacoustic spectroscopy (QEPAS) is reported. The evanescent field of TOFs with diameter down to sub-wavelength is utilized for photoacoustic excitation in photoacoustic spectroscopy. A quartz tuning fork (QTF) with resonant frequency about ~32.75 kHz is used to detect the generated pressure wave. A normalized noise equivalent absorption coefficient of 1.5×10-6cm-1W/√Hz is achieved for acetylene detection with a fiber taper with a waist diameter of 1.1 μm. It is found that QEPAS with TOFs of sub-wavelength diameters exhibit comparable sensitivities with open path QEPAS but with additional advantages of lower insertion loss, easier alignment, and multiplexing capability.

KW - evanescent field

KW - gas sensor

KW - Optical fiber sensor

KW - photoacoustic spectroscopy

KW - tapered optical fiber

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U2 - 10.1117/12.915786

DO - 10.1117/12.915786

M3 - Conference article published in proceeding or book

SN - 9780819490278

VL - 8351

BT - Third Asia Pacific Optical Sensors Conference

T2 - 3rd Asia Pacific Optical Sensors Conference

Y2 - 31 January 2012 through 3 February 2012

ER -

Gas detection with evanescent-wave quartz-enhanced photoacoustic spectroscopy

Abstract

Conference

Keywords

ASJC Scopus subject areas

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