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Title: Methods and systems for detecting gas flow by photoacoustic signal generation

Abstract

A method for the detection of a gas flowing from a location in a structure is described. A hollow-core optical fiber is placed in a position adjacent the structure. The fiber includes a sound-conductive cladding layer; and further includes at least one aperture extending into its cross-sectional diameter. A beam of pulsed, optical is transmitted into the fiber with a tunable laser. The optical energy is characterized by a wavelength that can be absorbed by the gas that flows into the fiber through the aperture. This causes a temperature fluctuation in the region of gas absorption, which in turn generates an acoustic wave in the absorption region. The acoustic wave travels through the cladding layer, and can be detected with a microphone, so as to provide the location of gas flow, based on the recorded position and movement of the acoustic wave. A related system is also described.

Inventors:
;
Issue Date:
Research Org.:
General Electric Co., Schenectady, NY (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1425841
Patent Number(s):
9910014
Application Number:
14/977,820
Assignee:
General Electric Company (Schenectady, NY)
Patent Classifications (CPCs):
G - PHYSICS G02 - OPTICS G02B - OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
DOE Contract Number:  
AR0000543
Resource Type:
Patent
Resource Relation:
Patent File Date: 2015 Dec 22
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Choudhury, Niloy, and Challener, William Albert. Methods and systems for detecting gas flow by photoacoustic signal generation. United States: N. p., 2018. Web.
Choudhury, Niloy, & Challener, William Albert. Methods and systems for detecting gas flow by photoacoustic signal generation. United States.
Choudhury, Niloy, and Challener, William Albert. Tue . "Methods and systems for detecting gas flow by photoacoustic signal generation". United States. https://www.osti.gov/servlets/purl/1425841.
@article{osti_1425841,
title = {Methods and systems for detecting gas flow by photoacoustic signal generation},
author = {Choudhury, Niloy and Challener, William Albert},
abstractNote = {A method for the detection of a gas flowing from a location in a structure is described. A hollow-core optical fiber is placed in a position adjacent the structure. The fiber includes a sound-conductive cladding layer; and further includes at least one aperture extending into its cross-sectional diameter. A beam of pulsed, optical is transmitted into the fiber with a tunable laser. The optical energy is characterized by a wavelength that can be absorbed by the gas that flows into the fiber through the aperture. This causes a temperature fluctuation in the region of gas absorption, which in turn generates an acoustic wave in the absorption region. The acoustic wave travels through the cladding layer, and can be detected with a microphone, so as to provide the location of gas flow, based on the recorded position and movement of the acoustic wave. A related system is also described.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {3}
}

Works referenced in this record:

Sensitive detection of methane with a 1.65 μm diode laser by photoacoustic and absorption spectroscopy
journal, April 1998


A room temperature SAW based methane gas sensors
conference, July 2013


Methane–oxygen electrochemical coupling in an ionic liquid: a robust sensor for simultaneous quantification
journal, January 2014


The Theory of the Propagation of Plane Sound Waves in Tubes
journal, August 1953


Applications of photoacoustic sensing techniques
journal, April 1986


High-sensitivity photoacoustic leak testing
journal, October 2003

  • Huang, Eric; Dowling, David R.; Whelan, Timothy
  • The Journal of the Acoustical Society of America, Vol. 114, Issue 4, p. 1926-1933
  • https://doi.org/10.1121/1.1605386

Two schemes for trace detection using cavity ringdown spectroscopy
journal, February 2004


High sensitivity in gas analysis with photoacoustic detection
journal, February 2004


Parametric dependencies for photoacoustic leak localization
journal, July 2002


Photoacoustic Spectroscopy, Theory
book, January 1999


Multi-gas sensing based on photoacoustic spectroscopy using tunable laser diodes
journal, December 2004


A room-temperature electrochemical sensor and instrument for monitoring methane
journal, September 1985


Investigation on an evanescent wave fiber-optic absorption sensor based on fiber loop cavity ring-down spectroscopy
journal, January 2010


Hollow-core microstructured polymer optical fiber
journal, January 2006


Demonstration of methane spectroscopy using a vertical-cavity surface-emitting laser at 1.68 µm with up to 5 MHz repetition rate
journal, December 2002


Chemical Sensing Using Fiber Cavity Ring-Down Spectroscopy
journal, March 2010