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GB1163154A - Temperature Senser. - Google Patents

Temperature Senser.

Info

Publication number
GB1163154A
GB1163154A GB3011567A GB3011567A GB1163154A GB 1163154 A GB1163154 A GB 1163154A GB 3011567 A GB3011567 A GB 3011567A GB 3011567 A GB3011567 A GB 3011567A GB 1163154 A GB1163154 A GB 1163154A
Authority
GB
United Kingdom
Prior art keywords
temperature
tbig
polarization
analyzer
crystal
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
GB3011567A
Inventor
Ronald Ferguson Pearson
Roger William Cooper
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.)
Philips Components Ltd
Original Assignee
Mullard Ltd
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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB3011567A priority Critical patent/GB1163154A/en
Priority to DE19681773725 priority patent/DE1773725A1/en
Priority to NL6809130A priority patent/NL6809130A/xx
Priority to FR1575960D priority patent/FR1575960A/fr
Publication of GB1163154A publication Critical patent/GB1163154A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Optics & Photonics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

1,163,154. Measuring temperature photoelectrically. MULLARD Ltd. May 17, 1968 [June 29, 1967], No.30115/67. Heading G1A. [Also in Division H4] A temperature sensor comprises a crystal of terbium iron garnet (TbIG), which exhibits a temperature dependent Faraday effect, and means for measuring the rotation of the plane of polarization of light due to the device. Measuring temperature. Plane polarized 1À15Á radiation from a He-Ne laser passes twice through a TbIG crystal 1 by reflection off a layer 2 and passes through an analyzer 8 to an infrared detector 9. A polepiece 3 provides sufficient magnetic field to saturate crystal 1 in the direction H 2 . The plane of polarization of the emergent beam 7 may be measured by adjusting the analyzer 8 for minimum transmission. Alternatively the analyzer may be fixed and the polarization of beam 7 allowed to vary between 40 degrees and 50 degrees of the maximum transmission position. Compensation for light source variations may be by a reference detector receiving light from the laser and controlling the drive to keep the intensity constant. Alternatively an A. C. polarization modulation of Œ 1 degree may be imposed on beam 4 by a modulator 6. The A. C. component of the detector signal is the separated out and the laser controlled to keep it constant. Two state operation TbIG exhibits a sudden change of sign of Faraday effect at a "compensation temperature". The sign of the effect may be detected and used as error signal for a two-step automatic temperature controller. The compensation temperature may be increased by incorporating Ga or Al in place of some of the Fe in the TbIg or reduced by In or Sc.
GB3011567A 1967-06-29 1967-06-29 Temperature Senser. Expired GB1163154A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB3011567A GB1163154A (en) 1967-06-29 1967-06-29 Temperature Senser.
DE19681773725 DE1773725A1 (en) 1967-06-29 1968-06-27 Method and device for measuring temperatures
NL6809130A NL6809130A (en) 1967-06-29 1968-06-28
FR1575960D FR1575960A (en) 1967-06-29 1968-07-01

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3011567A GB1163154A (en) 1967-06-29 1967-06-29 Temperature Senser.

Publications (1)

Publication Number Publication Date
GB1163154A true GB1163154A (en) 1969-09-04

Family

ID=10302523

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3011567A Expired GB1163154A (en) 1967-06-29 1967-06-29 Temperature Senser.

Country Status (4)

Country Link
DE (1) DE1773725A1 (en)
FR (1) FR1575960A (en)
GB (1) GB1163154A (en)
NL (1) NL6809130A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2843327A1 (en) * 1977-10-04 1979-04-12 Sperry Rand Ltd MAGNETO-OPTICAL PHASE MODULATION DEVICE
GB2228566A (en) * 1988-12-16 1990-08-29 Marconi Gec Ltd Infra-red sensors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2843327A1 (en) * 1977-10-04 1979-04-12 Sperry Rand Ltd MAGNETO-OPTICAL PHASE MODULATION DEVICE
FR2405491A1 (en) * 1977-10-04 1979-05-04 Sperry Rand Ltd MAGNETO-OPTICAL MODULATOR ESPECIALLY FOR LASERS
GB2228566A (en) * 1988-12-16 1990-08-29 Marconi Gec Ltd Infra-red sensors

Also Published As

Publication number Publication date
FR1575960A (en) 1969-07-25
DE1773725A1 (en) 1971-11-25
NL6809130A (en) 1968-12-30

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees