NO983281L - System for mÕling av frekvensvariasjoner i akustiske lysfiber-sensorer - Google Patents

System for mÕling av frekvensvariasjoner i akustiske lysfiber-sensorer

Info

Publication number
NO983281L
NO983281L NO983281A NO983281A NO983281L NO 983281 L NO983281 L NO 983281L NO 983281 A NO983281 A NO 983281A NO 983281 A NO983281 A NO 983281A NO 983281 L NO983281 L NO 983281L
Authority
NO
Norway
Prior art keywords
signals
modes
locking modes
fiber
acoustic
Prior art date
Application number
NO983281A
Other languages
English (en)
Other versions
NO983281D0 (no
Inventor
Donald A Frederick
Steven G Bell
Original Assignee
Litton Systems Inc
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 Litton Systems Inc filed Critical Litton Systems Inc
Publication of NO983281D0 publication Critical patent/NO983281D0/no
Publication of NO983281L publication Critical patent/NO983281L/no

Links

Classifications

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

Abstract

Et system for å utføre måling med høy oppløsning av frekvensvariasjoner i akustiske flermodus-fiberlasersensorer, har en ende-pumpet fibersensor som utsender flere låsende modi, hvor de nøyaktige frekvenser for de låsende modi som utsendes, avhenger av et strekk som virker på den akustiske sensoren. En optisk fiber er koplet til den aktive fibersensoren for å overføre de låsende modi. Den optiske fiberen overfører de flere låsende modi til en optisk forsterkerfiber, hvor signalene med de låsende modi blir forsterket. De forsterkede signalene med de låsende modi mates så igjennom en fasemodulator som er koplet til den optiske fiberen for å påtrykke en fasegenerert bærebølge på signalene med de låsende modi. Utgangssignalet fra fasemodulatoren leveres til et mottakende interferometer som har en forutbestemt bane-ubalanse for å analysere interferometrisk frekvensforskyvningene for hvert av signalene med de låsende modi, hvor den forutbestemte bane-ubalansen er tilpasset til longitudinalmodus-avstanden mellom den aktive fibersensorens låsende modi. En demodulasjonsenhet er koplet til det mottakende interferometeret for å motta og demodulere utgangssignalet fra det mottakende interferometeret, for å bestemme frekvensforskyvningen som signalene med de låsende modi har pådratt seg, hvor den demodulerte frekvensforskyvningen er proporsjonal med strekket som virker på den akustiske sensoren. I en alternativ utførelsesform kan flere aktive fibersensorer pumpes ved hjelp av en enkelt laserlyskilde, med deres utgangssignaler multiplekset sammen og matet gjennom det mottakende interferometeret for interferometrisk analyse av alle signalene.
NO983281A 1997-07-31 1998-07-16 System for mÕling av frekvensvariasjoner i akustiske lysfiber-sensorer NO983281L (no)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US5434797P 1997-07-31 1997-07-31
US08/958,365 US5867258A (en) 1997-07-31 1997-10-27 System for multiplexed high resolution measurement of frequency variations in multimode fiber laser acoustic sensors

Publications (2)

Publication Number Publication Date
NO983281D0 NO983281D0 (no) 1998-07-16
NO983281L true NO983281L (no) 1999-02-01

Family

ID=26732927

Family Applications (1)

Application Number Title Priority Date Filing Date
NO983281A NO983281L (no) 1997-07-31 1998-07-16 System for mÕling av frekvensvariasjoner i akustiske lysfiber-sensorer

Country Status (9)

Country Link
US (1) US5867258A (no)
EP (1) EP0895072A3 (no)
JP (1) JP2000241239A (no)
KR (1) KR19990014009A (no)
CN (1) CN1215155A (no)
AU (1) AU7511598A (no)
BR (1) BR9802829A (no)
CA (1) CA2240572C (no)
NO (1) NO983281L (no)

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US6542244B1 (en) * 1999-12-07 2003-04-01 Harris Corporation Variable sensitivity acoustic transducer
JP4220102B2 (ja) * 2000-05-02 2009-02-04 富士フイルム株式会社 動的変化検出方法、動的変化検出装置及び超音波診断装置
JP3903105B2 (ja) * 2000-05-23 2007-04-11 富士フイルム株式会社 動的変化検出方法、動的変化検出装置及び超音波診断装置
US6674928B2 (en) 2000-08-01 2004-01-06 The United States Of America As Represented By The Secretary Of The Navy Optical sensing device containing fiber Bragg gratings
EP1520159B1 (en) 2002-07-01 2017-10-25 Smart Autonomous Solutions Inc. Measuring strain in a structure ( bridge ) with a ( temperature compensated ) electromagnetic resonator ( microwave cavity )
US7154082B2 (en) * 2004-08-20 2006-12-26 Pgs Americas, Inc. Frequency division and/or wavelength division multiplexed recursive fiber optic telemetry scheme for an optical sensor array
DK1794561T3 (da) * 2004-09-28 2020-03-16 Commonwealth Australia Optoakustisk tryksensor
US8023669B2 (en) * 2005-06-13 2011-09-20 Technion Research And Development Foundation Ltd. Shielded communication transducer
US7441463B2 (en) * 2005-09-23 2008-10-28 University Of Manitoba Sensing system based on multiple resonant electromagnetic cavities
US7538860B2 (en) * 2007-08-17 2009-05-26 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration System and method for determination of the reflection wavelength of multiple low-reflectivity bragg gratings in a sensing optical fiber
US8515675B2 (en) * 2008-04-02 2013-08-20 Bakes Hughes Incorporated Method for analyzing strain data
CN101561536B (zh) * 2008-04-16 2010-07-28 中国科学院半导体研究所 一种抗振动与噪声干扰的光纤传感波长解调***
CN101887009B (zh) * 2010-03-22 2012-07-04 山东省科学院自动化研究所 基于光学声波传感器的本征安全光声光谱气体监测***
US20120086443A1 (en) * 2010-10-08 2012-04-12 Bazzone Michael L Generator Operation Monitoring
US8098967B1 (en) * 2010-10-08 2012-01-17 Michael Louis Bazzone Generator protection system
US8139905B1 (en) * 2010-10-08 2012-03-20 Michael Louis Bazzone Generator protection system
US9488786B2 (en) 2012-11-16 2016-11-08 General Electric Company Fiber optic sensing apparatus including fiber gratings and method for sensing parameters involving different parameter modalities
US20150212271A1 (en) * 2012-12-11 2015-07-30 Acacia Communications Inc. Optical waveguide terminators with doped waveguides
US9151924B2 (en) 2013-08-16 2015-10-06 General Electric Company Fiber optic sensing apparatus and method for sensing parameters involving different parameter modalities
US10495610B2 (en) * 2017-08-14 2019-12-03 Geoffrey A. Cranch Fiber optic acoustic emission sensor and apparatus
CN110274620B (zh) * 2019-07-26 2020-06-09 南京航空航天大学 一种基于频谱中心对齐的布里渊散射信号去噪方法
CN112903083B (zh) * 2019-12-04 2023-04-11 中国科学院上海光学精密机械研究所 基于多模光纤的高信噪比声传感器
FR3104730B1 (fr) * 2019-12-12 2021-12-24 Thales Sa Dispositif de mesure de signaux delivres par un reseau de capteurs a base de cavites laser a fibre optique
CN113091617B (zh) * 2021-03-29 2022-05-10 电子科技大学 一种多模光纤光程变化测量***
CN114062275B (zh) * 2021-11-18 2024-04-30 国网安徽省电力有限公司电力科学研究院 一种光纤光声传感器的空间域复用解调仪器及方法
WO2023196795A2 (en) * 2022-04-04 2023-10-12 University Of Pittsburgh-Of The Commonwealth System Of Higher Education Monitoring system based on multiplexed multimode interferometric sensors
US11656140B1 (en) 2022-04-25 2023-05-23 The Government Of The United States Of America, As Represented By The Secretary Of The Navy Coated fiber optic pressure sensor with improved acceleration response

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US5012088A (en) * 1989-03-31 1991-04-30 Cole James H High performance fiber optic sensor
US5555086A (en) * 1991-05-31 1996-09-10 Litton Systems, Inc. Coherence multiplexed interferometric signal processing system and method
US5513913A (en) * 1993-01-29 1996-05-07 United Technologies Corporation Active multipoint fiber laser sensor

Also Published As

Publication number Publication date
AU7511598A (en) 1999-02-11
US5867258A (en) 1999-02-02
CA2240572C (en) 2001-09-11
KR19990014009A (ko) 1999-02-25
CN1215155A (zh) 1999-04-28
EP0895072A3 (en) 1999-12-08
EP0895072A2 (en) 1999-02-03
BR9802829A (pt) 1999-11-23
JP2000241239A (ja) 2000-09-08
CA2240572A1 (en) 1999-01-31
NO983281D0 (no) 1998-07-16

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