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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:
;
Publication Date:
Research Org.:
General Electric Company, Schenectady, NY (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1425841
Patent Number(s):
9,910,014
Application Number:
14/977,820
Assignee:
General Electric Company (Schenectady, NY) ARPA-E
DOE Contract Number:  
AR0000543
Resource Type:
Patent
Resource Relation:
Patent File Date: 2015 Dec 22
Country of Publication:
United States
Language:
English

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. doi:. 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 = {Tue Mar 06 00:00:00 EST 2018},
month = {Tue Mar 06 00:00:00 EST 2018}
}

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