GB2020419A - Signal sensor - Google Patents

Signal sensor

Info

Publication number
GB2020419A
GB2020419A GB7915075A GB7915075A GB2020419A GB 2020419 A GB2020419 A GB 2020419A GB 7915075 A GB7915075 A GB 7915075A GB 7915075 A GB7915075 A GB 7915075A GB 2020419 A GB2020419 A GB 2020419A
Authority
GB
United Kingdom
Prior art keywords
signal
fibre
sensed
transducer
peak frequency
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
GB7915075A
Other versions
GB2020419B (en
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.)
KINGSLEY SA
Original Assignee
KINGSLEY SA
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 KINGSLEY SA filed Critical KINGSLEY SA
Priority to GB7915075A priority Critical patent/GB2020419B/en
Publication of GB2020419A publication Critical patent/GB2020419A/en
Application granted granted Critical
Publication of GB2020419B publication Critical patent/GB2020419B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating 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)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

The presence or magnitude of a signal 5 is sensed by a signal transducer 4 around which an optical fibre 1 is wrapped so that the length of the fibre is modulated by any signal present. A laser supplies coherent light to one end of the fibre and a homodyne detector 3 is provided at the other end. Discontinuities at both ends of the fibre cause multiple reflections which produce differential phase modulations of the signal. The detected signal contains a large number of frequency components and the peak frequency is related to the amplitude of the original signal. The peak frequency is indicated by a suitable filter arrangement. The signal to be sensed may be electrical, in which case transducer 4 is a piezo crystal; alternatively, if the signal is a vibration, it can be mechanically or acoustically coupled to the body 4. <IMAGE>
GB7915075A 1978-05-05 1979-05-01 Signal sensor Expired GB2020419B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7915075A GB2020419B (en) 1978-05-05 1979-05-01 Signal sensor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1800478 1978-05-05
GB7915075A GB2020419B (en) 1978-05-05 1979-05-01 Signal sensor

Publications (2)

Publication Number Publication Date
GB2020419A true GB2020419A (en) 1979-11-14
GB2020419B GB2020419B (en) 1982-07-21

Family

ID=26253050

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7915075A Expired GB2020419B (en) 1978-05-05 1979-05-01 Signal sensor

Country Status (1)

Country Link
GB (1) GB2020419B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536088A (en) * 1982-09-17 1985-08-20 Rashleigh Scott C Polarimetric Fabry-Perot sensor
DE3727167A1 (en) * 1987-08-14 1989-02-23 Teldix Gmbh FIBER GYRO
DE4224744A1 (en) * 1992-07-27 1994-02-03 Abb Research Ltd Interferometer for detecting electric field generated vibration of metallic particles in gas insulated HV switchgear - feeds laser beam into sensing and reference optical fibre branches of Mach=Zehnder interferometer, has two photodetectors at output of combiner-divider and control loop for zeroing difference between detector voltages

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536088A (en) * 1982-09-17 1985-08-20 Rashleigh Scott C Polarimetric Fabry-Perot sensor
DE3727167A1 (en) * 1987-08-14 1989-02-23 Teldix Gmbh FIBER GYRO
DE4224744A1 (en) * 1992-07-27 1994-02-03 Abb Research Ltd Interferometer for detecting electric field generated vibration of metallic particles in gas insulated HV switchgear - feeds laser beam into sensing and reference optical fibre branches of Mach=Zehnder interferometer, has two photodetectors at output of combiner-divider and control loop for zeroing difference between detector voltages

Also Published As

Publication number Publication date
GB2020419B (en) 1982-07-21

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee