JPS5516551A - Information detection system by photo transmitter - Google Patents

Information detection system by photo transmitter

Info

Publication number
JPS5516551A
JPS5516551A JP8910378A JP8910378A JPS5516551A JP S5516551 A JPS5516551 A JP S5516551A JP 8910378 A JP8910378 A JP 8910378A JP 8910378 A JP8910378 A JP 8910378A JP S5516551 A JPS5516551 A JP S5516551A
Authority
JP
Japan
Prior art keywords
photo
leakage
detected
detection
pulses
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.)
Granted
Application number
JP8910378A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6211297B2 (enrdf_load_stackoverflow
Inventor
Masamitsu Tokuda
Mikio Kokayu
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.)
Furukawa Electric Co Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Furukawa Electric Co Ltd
Nippon Telegraph and Telephone Corp
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 Furukawa Electric Co Ltd, Nippon Telegraph and Telephone Corp filed Critical Furukawa Electric Co Ltd
Priority to JP8910378A priority Critical patent/JPS5516551A/ja
Publication of JPS5516551A publication Critical patent/JPS5516551A/ja
Publication of JPS6211297B2 publication Critical patent/JPS6211297B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Measuring Volume Flow (AREA)
  • Examining Or Testing Airtightness (AREA)
JP8910378A 1978-07-21 1978-07-21 Information detection system by photo transmitter Granted JPS5516551A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8910378A JPS5516551A (en) 1978-07-21 1978-07-21 Information detection system by photo transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8910378A JPS5516551A (en) 1978-07-21 1978-07-21 Information detection system by photo transmitter

Publications (2)

Publication Number Publication Date
JPS5516551A true JPS5516551A (en) 1980-02-05
JPS6211297B2 JPS6211297B2 (enrdf_load_stackoverflow) 1987-03-11

Family

ID=13961542

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8910378A Granted JPS5516551A (en) 1978-07-21 1978-07-21 Information detection system by photo transmitter

Country Status (1)

Country Link
JP (1) JPS5516551A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
JPS6211297B2 (enrdf_load_stackoverflow) 1987-03-11

Similar Documents

Publication Publication Date Title
JPS53113401A (en) Light communication system
ES414515A1 (es) Un dispositivo medidor de regidez.
GB1520096A (en) Method of and apparatus for detecting damage to frangible objects
JPS5516551A (en) Information detection system by photo transmitter
SE9202112D0 (sv) Foerfarande och anordning foer oevervakning av foergrenade optiska ledningsnaet
JPS5682428A (en) Optical fiber sensor device
JPS53148488A (en) Detecting method of leaking points of fluid conveying paths and apparatus for the same
JPS54150160A (en) Landslide detecting system
JPS5516550A (en) Information detection system by photo transmitter
JPS57175442A (en) Obstacle indicator for vehicle
JPS5451859A (en) Fault point searching system of optical fiber transmission lines
JPS5424687A (en) Detecting method of liquid concentration
JPS5524225A (en) Information detecting system by optical transmitter
JPS545546A (en) Desconnection detector for transmission line
JPS5314507A (en) Multiple signal collection/delivery unit
JPS5345258A (en) Measuring method and system for transmission property of optical fiber
JPS57103080A (en) Object detector
JPS5662435A (en) Optical data link
JPS5390708A (en) Transmitting system for synchronous signal
JPS526583A (en) Detecting method of leakage in fluid line
JPS5739656A (en) Detection system for open subscriber line
JPS54157405A (en) Error detecting method for signal transmission
JPS548549A (en) Operation checking system in power generating type telemeters
JPS5317752A (en) Ultrasonic transmitter and receiver installing system
FR2554658B1 (fr) Procede de detection de signaux alternatifs transmis sur les lignes telephoniques