JPS56108928A - Temperature detector - Google Patents

Temperature detector

Info

Publication number
JPS56108928A
JPS56108928A JP995280A JP995280A JPS56108928A JP S56108928 A JPS56108928 A JP S56108928A JP 995280 A JP995280 A JP 995280A JP 995280 A JP995280 A JP 995280A JP S56108928 A JPS56108928 A JP S56108928A
Authority
JP
Japan
Prior art keywords
light
crystal
birefringent crystal
temperature
polarized
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.)
Pending
Application number
JP995280A
Other languages
Japanese (ja)
Inventor
Hideto Iwaoka
Masami Imamoto
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.)
Yokogawa Electric Corp
Original Assignee
Yokogawa Hokushin Electric Corp
Yokogawa Electric Works 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 Yokogawa Hokushin Electric Corp, Yokogawa Electric Works Ltd filed Critical Yokogawa Hokushin Electric Corp
Priority to JP995280A priority Critical patent/JPS56108928A/en
Publication of JPS56108928A publication Critical patent/JPS56108928A/en
Pending 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
    • G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

PURPOSE:To eliminate influence of various induced noises by detecting the temperature from the phase shift of a light which is a linear polarization light beam passed through birefringent crystal whose double refraction depends upon the temperature. CONSTITUTION:Light emitted from light source 1 is made by polarizer 21 into linear polarized light, which propagates in optical fiber 11 to strike birefringent crystal 30 whose double refraction depends upon the temperature. The light incident to birefringent crystal has planes of polarization at 45 deg. to normal beam X1 and abnormal beam X2 and X1 and X2 travel in the crystal at different speeds, causing phase difference during the traveling in the crystal. The composite output light from birefringent crystal 30 is an elliptic polarized beam because of the phase difference and applied to polarizing prism 42 via lambda/4 phase plate 41 and the prism separates it into light P1 of a polarized component parallel to polarizer 21 and light P2 of a component perpendicular to it; and they are photodetected by photoelectric converting elements 51 and 52 to input electric signals E1 and E2, corresponding to P1 and P2, to operator 50.
JP995280A 1980-02-01 1980-02-01 Temperature detector Pending JPS56108928A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP995280A JPS56108928A (en) 1980-02-01 1980-02-01 Temperature detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP995280A JPS56108928A (en) 1980-02-01 1980-02-01 Temperature detector

Publications (1)

Publication Number Publication Date
JPS56108928A true JPS56108928A (en) 1981-08-28

Family

ID=11734295

Family Applications (1)

Application Number Title Priority Date Filing Date
JP995280A Pending JPS56108928A (en) 1980-02-01 1980-02-01 Temperature detector

Country Status (1)

Country Link
JP (1) JPS56108928A (en)

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