JPS63208731A - Measuring instrument for back raman scattered light of optical fiber - Google Patents

Measuring instrument for back raman scattered light of optical fiber

Info

Publication number
JPS63208731A
JPS63208731A JP4036787A JP4036787A JPS63208731A JP S63208731 A JPS63208731 A JP S63208731A JP 4036787 A JP4036787 A JP 4036787A JP 4036787 A JP4036787 A JP 4036787A JP S63208731 A JPS63208731 A JP S63208731A
Authority
JP
Japan
Prior art keywords
light
incident
interference filter
optical fiber
scattered light
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
JP4036787A
Other languages
Japanese (ja)
Inventor
Satoru Yamamoto
Original Assignee
Hitachi Cable 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 Hitachi Cable Ltd filed Critical Hitachi Cable Ltd
Priority to JP4036787A priority Critical patent/JPS63208731A/en
Publication of JPS63208731A publication Critical patent/JPS63208731A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To improve measurement sensitivity and to decrease the number of components by employing an optical system which uses the same interference filters as a light splitting means and a wave-length selecting means.
CONSTITUTION: Light from a light source such as a laser is made incident on a 1st interference filter 11 and an end surface of an optical fiber 4 is placed on the optical axis of light with center wavelength λ0 which is transmitted through the filter. Back scattered light generated in the optical fiber 4 with the incident light is made incident on the 1st interference filter 11 in the opposite from the incident light and light with wavelength which is not nearby the Rayleigh scattered light with the same wavelength λ0 with the incident light to the optical fiber 4 is reflected by the interference filter 11. A 2nd interference filter 12 is installed on the optical axis of this reflected light. Only anti-Stokes' light is transmitted through the 2nd interference filter 12 and is made incident on a photodetector 9. The photodetected light is converted into an electric signal. Its intensity is measured. Only Stocks' light is transmitted through a 3rd interference filter 13, and photodetected by a photodetector 7 and converted into an electric signal so that the intensity of the anti-Stokes' light is measured.
COPYRIGHT: (C)1988,JPO&Japio
JP4036787A 1987-02-25 1987-02-25 Measuring instrument for back raman scattered light of optical fiber Pending JPS63208731A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4036787A JPS63208731A (en) 1987-02-25 1987-02-25 Measuring instrument for back raman scattered light of optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4036787A JPS63208731A (en) 1987-02-25 1987-02-25 Measuring instrument for back raman scattered light of optical fiber

Publications (1)

Publication Number Publication Date
JPS63208731A true JPS63208731A (en) 1988-08-30

Family

ID=12578669

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4036787A Pending JPS63208731A (en) 1987-02-25 1987-02-25 Measuring instrument for back raman scattered light of optical fiber

Country Status (1)

Country Link
JP (1) JPS63208731A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02201131A (en) * 1989-01-30 1990-08-09 Hitachi Cable Ltd Optical fiber system distribution type temperature sensor
JPH02276932A (en) * 1989-01-30 1990-11-13 Hitachi Cable Ltd Optical fiber distribution type temperature sensor
CN102346145A (en) * 2010-07-22 2012-02-08 索尼公司 Fine particle measuring device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3207910A (en) * 1959-03-12 1965-09-21 Int Standard Electric Corp Photosensitive arrangement for scanning fluorescing identifications
JPS51131374A (en) * 1975-05-12 1976-11-15 Hitachi Ltd Filter photometer for multi-wave length
JPS61270632A (en) * 1985-05-25 1986-11-29 Hitachi Cable Ltd Optical fiber type measuring instrument for temperature distribution

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3207910A (en) * 1959-03-12 1965-09-21 Int Standard Electric Corp Photosensitive arrangement for scanning fluorescing identifications
JPS51131374A (en) * 1975-05-12 1976-11-15 Hitachi Ltd Filter photometer for multi-wave length
JPS61270632A (en) * 1985-05-25 1986-11-29 Hitachi Cable Ltd Optical fiber type measuring instrument for temperature distribution

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02201131A (en) * 1989-01-30 1990-08-09 Hitachi Cable Ltd Optical fiber system distribution type temperature sensor
JPH02276932A (en) * 1989-01-30 1990-11-13 Hitachi Cable Ltd Optical fiber distribution type temperature sensor
JPH0711458B2 (en) * 1989-01-30 1995-02-08 日立電線株式会社 Optical fiber distributed temperature sensor
CN102346145A (en) * 2010-07-22 2012-02-08 索尼公司 Fine particle measuring device

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