GB1269289A - Apparatus for responding to a magnetic field - Google Patents

Apparatus for responding to a magnetic field

Info

Publication number
GB1269289A
GB1269289A GB2012870A GB2012870A GB1269289A GB 1269289 A GB1269289 A GB 1269289A GB 2012870 A GB2012870 A GB 2012870A GB 2012870 A GB2012870 A GB 2012870A GB 1269289 A GB1269289 A GB 1269289A
Authority
GB
United Kingdom
Prior art keywords
current
light
polarization
photo
plane
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.)
Expired
Application number
GB2012870A
Inventor
Roger Monnot
James Teboul
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.)
TRANSFORMATEURS DE MESURE WALT
Original Assignee
TRANSFORMATEURS DE MESURE WALT
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 TRANSFORMATEURS DE MESURE WALT filed Critical TRANSFORMATEURS DE MESURE WALT
Publication of GB1269289A publication Critical patent/GB1269289A/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
    • G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
    • G01R15/246—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect based on the Faraday, i.e. linear magneto-optic, effect
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

1,269,289. Photo-electric current measurement. TRANSFORMATEURS DE MESURE WALTER. April 27, 1970 [April 25, 1969], No.20128/70. Headings G1A and G1U. The current in a high voltage line is measured by use of a magnetic field responsive polarizing device which rotates the plane of polarization of a modulated light beam before it is detected and demodulated to indicate the current. As shown luminescent diode 10 is energized by oscillator 20 having a frequency of 20 KHz and the light output passes through polarizer 11 and is reflected by mirror 12 along axis A where it passes through two magnetic field responsive polarizing elements 21, 22 having windings 21A, 22A respectively. Winding 22A carries a current proportional to the A.C. line current which is to be measured and thus the rotation of the plane of polarization of the light beam is modulated at 50Hz. The top of element 22 is made reflective (see Specification 1,264,588) so that the beam passes back through elements 22, 21, mirror 12 to beam-splitting mirror 13 to photo-transistors 15, 17 through polarizers 14, 16 respectively. The electrical signals pass to differential amplifier 18 where they are amplified and filtered, and thus to demodulator 19. The output of demodulator 19 supplies amplifier 23 which energizes winding 21A to produce an equal and opposite rotation of the plane of polarization to that produced in element 22 so that the current in winding 21A is proportional to the line current. In modifications an astatic system (see Specification 1,207,540) is formed by providing a beam-splitting prism to direct light on to two mirrors each of which reflects the light along a path like the one shown. The returned light in each path is detected in a single photo-detector, Fig. 2 (not shown). Further modifications include the use of two light sources or semi-transparent mirrors with a single light source, Figs. 3 and 4 (not shown). A further modification uses a single light source to illuminate two channels in series, Fig. 5 (not shown). These two channel systems may be balanced by providing a circuit, Fig. 6 (not shown) which detects the unbalance of the channels and injects a modulated voltage into one of the inputs of amplifier 18.
GB2012870A 1969-04-25 1970-04-27 Apparatus for responding to a magnetic field Expired GB1269289A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6913152A FR2041009A1 (en) 1969-04-25 1969-04-25

Publications (1)

Publication Number Publication Date
GB1269289A true GB1269289A (en) 1972-04-06

Family

ID=9033057

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2012870A Expired GB1269289A (en) 1969-04-25 1970-04-27 Apparatus for responding to a magnetic field

Country Status (5)

Country Link
CH (1) CH523505A (en)
DE (1) DE2019934A1 (en)
FR (1) FR2041009A1 (en)
GB (1) GB1269289A (en)
SE (1) SE358965B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52119367A (en) * 1976-03-31 1977-10-06 Ono Yutaka Method and apparatus for detecting voltage using phototransformer
GB1532508A (en) * 1976-07-20 1978-11-15 Standard Telephones Cables Ltd Telecommunication systems
FR2475230A1 (en) * 1980-02-01 1981-08-07 Electricite De France Optical method for current measurement - uses magneto=optical interaction between field around wire and laser light passing through coiled optical fibre

Also Published As

Publication number Publication date
SE358965B (en) 1973-08-13
FR2041009A1 (en) 1971-01-29
DE2019934A1 (en) 1970-11-05
CH523505A (en) 1972-05-31

Similar Documents

Publication Publication Date Title
US4171908A (en) Automatic two wavelength photoelasticimeter
FR1509786A (en) Method and device for remote measurement using modulated light beams
GB1276798A (en) Method of and apparatus for measuring the plane of polarisation of polarized light
GB1239715A (en)
US3634682A (en) Laser interferometer-type servo-positioning system comprising velocity control network and phase-lock network
GB1333152A (en) Electro-optical measuring apparatus
GB1231431A (en)
GB1269289A (en) Apparatus for responding to a magnetic field
US3230820A (en) Polarimeter
GB1392395A (en) Stabilization of optical path length differences
GB1181538A (en) Improvements in or relating to Photoelectric MOnitoring Devices.
GB1274241A (en) Apparatus for measuring the refraction index of a medium along a light path
GB1360922A (en) Magneto-optic readout apparatus
GB1333799A (en) Apparatus for responding to a magnetic field
US3637311A (en) Optical dichroism measuring apparatus and method
GB1264588A (en)
US5028865A (en) Device having main and secondary optical sensors
GB1263324A (en) Circular dichroism measurement system
GB1308957A (en) Methods and apparatus for determining the distance of an object
SU1315797A1 (en) Fibre-optic transducer
JPS5655811A (en) Sensor
GB1138225A (en) Improvements in or relating to optical interferometers
JPS6256968B2 (en)
GB1436314A (en) Apparatus for measuring the speed of light
GB1207540A (en) Apparatus for responding to a magnetic field or to an electric current producing a magnetic field