IN2012DN03047A - - Google Patents

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Publication number
IN2012DN03047A
IN2012DN03047A IN3047DEN2012A IN2012DN03047A IN 2012DN03047 A IN2012DN03047 A IN 2012DN03047A IN 3047DEN2012 A IN3047DEN2012 A IN 3047DEN2012A IN 2012DN03047 A IN2012DN03047 A IN 2012DN03047A
Authority
IN
India
Prior art keywords
signal
measured
change
derivative
rate
Prior art date
Application number
Inventor
Ian Crickmore Roger
John Hill David
Original Assignee
Qinetiq Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qinetiq Ltd filed Critical Qinetiq Ltd
Publication of IN2012DN03047A publication Critical patent/IN2012DN03047A/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35303—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using a reference fibre, e.g. interferometric devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
    • G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Transform (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Instruments For Measurement Of Length By Optical Means (AREA)

Abstract

A method of distributed acoustic sensing (DAS) whereby the derivative or rate of change of a signal backscatted from a fibre is measured. The change, or derivative of the phase measured in this way has a much smaller amplitude than the sig­nal itself if the difference between the two times at which the signal is measured is much less than the period of the signal being measured, resulting in lower sensitivity. Frequency shifts can be applied to temporally displaced return signals to compare the rate of change, for example by employing an output interferometer arranged to modulate the signal in each arm by a different frequen­cy shift.
IN3047DEN2012 2009-09-30 2010-09-24 IN2012DN03047A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0917150.5A GB0917150D0 (en) 2009-09-30 2009-09-30 Phase based sensing
PCT/GB2010/001802 WO2011039501A2 (en) 2009-09-30 2010-09-24 Phase based sensing

Publications (1)

Publication Number Publication Date
IN2012DN03047A true IN2012DN03047A (en) 2015-07-31

Family

ID=41350608

Family Applications (1)

Application Number Title Priority Date Filing Date
IN3047DEN2012 IN2012DN03047A (en) 2009-09-30 2010-09-24

Country Status (11)

Country Link
US (1) US8537345B2 (en)
EP (1) EP2483639B1 (en)
JP (1) JP5469749B2 (en)
CN (1) CN102612639B (en)
BR (1) BR112012007192B1 (en)
CA (1) CA2775845C (en)
GB (1) GB0917150D0 (en)
IN (1) IN2012DN03047A (en)
MX (1) MX2012003815A (en)
RU (1) RU2556748C2 (en)
WO (1) WO2011039501A2 (en)

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Also Published As

Publication number Publication date
RU2012117750A (en) 2013-11-20
JP5469749B2 (en) 2014-04-16
RU2556748C2 (en) 2015-07-20
CA2775845C (en) 2017-11-14
WO2011039501A3 (en) 2012-02-16
JP2013506828A (en) 2013-02-28
MX2012003815A (en) 2012-06-19
US20120188533A1 (en) 2012-07-26
CA2775845A1 (en) 2011-04-07
EP2483639B1 (en) 2020-03-04
BR112012007192B1 (en) 2021-06-22
CN102612639B (en) 2014-10-08
GB0917150D0 (en) 2009-11-11
BR112012007192A2 (en) 2016-03-29
CN102612639A (en) 2012-07-25
WO2011039501A2 (en) 2011-04-07
EP2483639A2 (en) 2012-08-08
US8537345B2 (en) 2013-09-17

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