SE9101237L - OPTICAL FIBER CABLE FOR DETECTING A TEMPERATURE CHANGE - Google Patents

OPTICAL FIBER CABLE FOR DETECTING A TEMPERATURE CHANGE

Info

Publication number
SE9101237L
SE9101237L SE9101237A SE9101237A SE9101237L SE 9101237 L SE9101237 L SE 9101237L SE 9101237 A SE9101237 A SE 9101237A SE 9101237 A SE9101237 A SE 9101237A SE 9101237 L SE9101237 L SE 9101237L
Authority
SE
Sweden
Prior art keywords
fibre
fibre cable
wax
expansion body
wire
Prior art date
Application number
SE9101237A
Other languages
Swedish (sv)
Other versions
SE9101237D0 (en
SE467598B (en
Inventor
E B Bergqvist
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Publication of SE9101237D0 publication Critical patent/SE9101237D0/en
Priority to DE69114251T priority Critical patent/DE69114251T2/en
Priority to AT91850294T priority patent/ATE129807T1/en
Priority to ES91850294T priority patent/ES2089175T3/en
Priority to DK91850294.9T priority patent/DK0490849T3/en
Priority to EP91850294A priority patent/EP0490849B1/en
Publication of SE9101237L publication Critical patent/SE9101237L/en
Publication of SE467598B publication Critical patent/SE467598B/en
Priority to US07/980,099 priority patent/US5231681A/en

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

An optical fibre cable 6 for temperature detection has an optical fibre 13 and a temperature-dependent expansion body. The fibre 13 and the expansion body are held together by a helically wound wire 14. The expansion body comprises an elastic tube 11 which contains wax with the desired melting point. When the wax melts, it expands and the tube 11 swells so that the wire 14 is stretched and the optical fibre 13 is bent. The fibre cable 6 is used in an OTDR system. The run time of light pulses P is measured and a heated section of the fibre cable 6 is detected by damped, reflected light pulses being detected. By selecting parameter values for the fibre cable 6, for example the pitch S of the helical wire 14 and the volume expansion of the wax, the desired light attenuation in the range 0.01-0.1 dB/m can be obtained. In this way, the positions of a number of heated parts along the fibre cable 6 can be determined. <IMAGE>
SE9101237A 1990-12-14 1991-04-24 Optical fibre cable for detecting a temperature change SE467598B (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE69114251T DE69114251T2 (en) 1990-12-14 1991-11-26 Optical fiber for the detection of temperature changes.
AT91850294T ATE129807T1 (en) 1990-12-14 1991-11-26 OPTICAL FIBER FOR DETECTING TEMPERATURE CHANGES.
ES91850294T ES2089175T3 (en) 1990-12-14 1991-11-26 A FIBER OPTIC CABLE TO DETECT A TEMPERATURE CHANGE.
DK91850294.9T DK0490849T3 (en) 1990-12-14 1991-11-26 Optical fiber cable for detecting a temperature change
EP91850294A EP0490849B1 (en) 1990-12-14 1991-11-26 An optical fibre cable for detecting a change in temperature
US07/980,099 US5231681A (en) 1990-12-14 1992-11-23 Optical fibre cable for detecting a change in temperature

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9004005A SE9004005D0 (en) 1990-12-14 1990-12-14 OPTICAL FIBER CABLE FOR DETECTING A TEMPERATURE CHANGE

Publications (3)

Publication Number Publication Date
SE9101237D0 SE9101237D0 (en) 1991-04-24
SE9101237L true SE9101237L (en) 1992-06-15
SE467598B SE467598B (en) 1992-08-10

Family

ID=20381201

Family Applications (2)

Application Number Title Priority Date Filing Date
SE9004005A SE9004005D0 (en) 1990-12-14 1990-12-14 OPTICAL FIBER CABLE FOR DETECTING A TEMPERATURE CHANGE
SE9101237A SE467598B (en) 1990-12-14 1991-04-24 Optical fibre cable for detecting a temperature change

Family Applications Before (1)

Application Number Title Priority Date Filing Date
SE9004005A SE9004005D0 (en) 1990-12-14 1990-12-14 OPTICAL FIBER CABLE FOR DETECTING A TEMPERATURE CHANGE

Country Status (1)

Country Link
SE (2) SE9004005D0 (en)

Also Published As

Publication number Publication date
SE9101237D0 (en) 1991-04-24
SE467598B (en) 1992-08-10
SE9004005D0 (en) 1990-12-14

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