JPS5473085A - Earthquake sensor using optical fibers - Google Patents

Earthquake sensor using optical fibers

Info

Publication number
JPS5473085A
JPS5473085A JP14014877A JP14014877A JPS5473085A JP S5473085 A JPS5473085 A JP S5473085A JP 14014877 A JP14014877 A JP 14014877A JP 14014877 A JP14014877 A JP 14014877A JP S5473085 A JPS5473085 A JP S5473085A
Authority
JP
Japan
Prior art keywords
detecting part
fiber cable
photo detecting
fiber
troubles
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
JP14014877A
Other languages
Japanese (ja)
Inventor
Noboru Tsuneyo
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP14014877A priority Critical patent/JPS5473085A/en
Publication of JPS5473085A publication Critical patent/JPS5473085A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

PURPOSE:To achieve the improvement in sensitivity and reduction in troubles by disposing a fiber element bundle to photo detecting part. CONSTITUTION:A photo detector 151 is constituted by one end of the fiber cable bundle 15 connected to a photoelectric converter 16 with respect to the condensing optical system 131 mounted to one end of one fiber cable 13 connected to an optical branching filter 12. Then, when earthquake occurs, the light beam focussed at the condensing optical system 131 in the earthquake sensor 14 causes a position deviation and enters the position deviated from the center of the photo detecting part 151. It is then converted to an electric signal by a photoelectric transducer 16, after which the electric signal is subjected to specified processing in a signal processing part 17 and is then inputted to a central processing unit 18. Since the photo detecting part 151 is constituted by the section of the fiber cable bundle 15 comprising disposing a multiplicity of fiber cables of a micro diameter in concentrical circular form, the sensitivity is increased and in addition, troubles are less because there are no mechanical moving parts.
JP14014877A 1977-11-22 1977-11-22 Earthquake sensor using optical fibers Pending JPS5473085A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14014877A JPS5473085A (en) 1977-11-22 1977-11-22 Earthquake sensor using optical fibers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14014877A JPS5473085A (en) 1977-11-22 1977-11-22 Earthquake sensor using optical fibers

Publications (1)

Publication Number Publication Date
JPS5473085A true JPS5473085A (en) 1979-06-12

Family

ID=15261978

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14014877A Pending JPS5473085A (en) 1977-11-22 1977-11-22 Earthquake sensor using optical fibers

Country Status (1)

Country Link
JP (1) JPS5473085A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58130236U (en) * 1982-02-26 1983-09-02 赤井電機株式会社 Acoustic vibration detection device
JPS62184437U (en) * 1986-05-15 1987-11-24

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58130236U (en) * 1982-02-26 1983-09-02 赤井電機株式会社 Acoustic vibration detection device
JPS62184437U (en) * 1986-05-15 1987-11-24

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