CA2384971A1 - Fiber optic seismic sensor - Google Patents

Fiber optic seismic sensor Download PDF

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Publication number
CA2384971A1
CA2384971A1 CA002384971A CA2384971A CA2384971A1 CA 2384971 A1 CA2384971 A1 CA 2384971A1 CA 002384971 A CA002384971 A CA 002384971A CA 2384971 A CA2384971 A CA 2384971A CA 2384971 A1 CA2384971 A1 CA 2384971A1
Authority
CA
Canada
Prior art keywords
central support
optical fiber
support plate
spiral
support members
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002384971A
Other languages
French (fr)
Other versions
CA2384971C (en
Inventor
Samuel N. Fersht
David B. Hall
Carl Bathelt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Northrop Grumman Systems Corp
Original Assignee
Individual
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 Individual filed Critical Individual
Priority claimed from PCT/US2000/029629 external-priority patent/WO2001040742A2/en
Publication of CA2384971A1 publication Critical patent/CA2384971A1/en
Application granted granted Critical
Publication of CA2384971C publication Critical patent/CA2384971C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
    • G01P15/093—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by photoelectric pick-up
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
    • G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
    • G01V1/186—Hydrophones

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Acoustics & Sound (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

A fiber optic seismic sensor (10) includes a pair of central support members (30, 32) formed of a metal such as aluminum. A support plate (42) has an inner portion (39) retained between the central support members (30, 32) and an outer portion (41) that extends beyond the central support members (30, 32). A pair of hollow cylindrical substrates (14, 18) are mounted in axial alignment on opposite sides of the outer portion (41) of the support plate (41) with the central support members (30, 32) extending through the centers of the substrates (14, 18). The central support member (30) has a cavity (36) in one end, and the central support member (32) has a projection (38) extending therefrom and arranged to be received within the cavity (36) in the first central support member (30). The support plate (42) includes a passage (44) arranged to receive the projection (38) such that the inner portion (39) of the support plate (42) is retained between the first and second central support members (30, 32). A first spiral-wound optical fiber coil (14) is formed on an outer end (22) of the first substrate (14), and a second spiral-wound optical fiber coil (16) is formed on an outer end (26) of the second substrate (16). An interferometer (50) includes the first spiral-wound optical fiber coil (14) in a first leg and the second spiral-wound optical fiber coil (16) in a second leg.
Acceleration along an axis perpendicular to the planes of the optical fiber coils (14, 16) causes a deflection in the support plate (42), which changes the difference in length of optical fiber coils (14, 16).
CA002384971A 1999-10-29 2000-10-26 Fiber optic seismic sensor Expired - Lifetime CA2384971C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US16270299P 1999-10-29 1999-10-29
US60/162,702 1999-10-29
US69779900A 2000-10-25 2000-10-25
US09/697,799 2000-10-25
PCT/US2000/029629 WO2001040742A2 (en) 1999-10-29 2000-10-26 Fiber optic seismic sensor

Publications (2)

Publication Number Publication Date
CA2384971A1 true CA2384971A1 (en) 2001-06-07
CA2384971C CA2384971C (en) 2004-04-20

Family

ID=26858989

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002384971A Expired - Lifetime CA2384971C (en) 1999-10-29 2000-10-26 Fiber optic seismic sensor

Country Status (3)

Country Link
KR (1) KR100443386B1 (en)
AU (1) AU763237B2 (en)
CA (1) CA2384971C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11371877B1 (en) * 2020-11-25 2022-06-28 Amazon Technologies, Inc. Vibration amplification and detection device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5317929A (en) * 1991-02-07 1994-06-07 Brown David A Fiber optic flexural disk accelerometer
US5903349A (en) * 1997-04-21 1999-05-11 The United States Of America As Represented By The Secretary Of The Navy Fiber optic accelerometer sensor and a method of constructing same
US5883308A (en) * 1997-06-09 1999-03-16 Litton Systems, Inc. Fiber optic twist ring accelerometer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11371877B1 (en) * 2020-11-25 2022-06-28 Amazon Technologies, Inc. Vibration amplification and detection device

Also Published As

Publication number Publication date
CA2384971C (en) 2004-04-20
KR20020065495A (en) 2002-08-13
KR100443386B1 (en) 2004-08-09
AU2724101A (en) 2001-06-12
AU763237B2 (en) 2003-07-17

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Effective date: 20201026