GB2020419A - Signal sensor - Google Patents
Signal sensorInfo
- 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
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>
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)
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 |
-
1979
- 1979-05-01 GB GB7915075A patent/GB2020419B/en not_active Expired
Cited By (3)
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 |