JPS57187677A - Measuring device for speed - Google Patents

Measuring device for speed

Info

Publication number
JPS57187677A
JPS57187677A JP7300981A JP7300981A JPS57187677A JP S57187677 A JPS57187677 A JP S57187677A JP 7300981 A JP7300981 A JP 7300981A JP 7300981 A JP7300981 A JP 7300981A JP S57187677 A JPS57187677 A JP S57187677A
Authority
JP
Japan
Prior art keywords
speed
beams
optical fiber
railroad
splitter
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
JP7300981A
Other languages
Japanese (ja)
Inventor
Shuichi Tai
Kazuo Hisama
Toshio Aranishi
Masahiro Nunoshita
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP7300981A priority Critical patent/JPS57187677A/en
Publication of JPS57187677A publication Critical patent/JPS57187677A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/50—Systems of measurement based on relative movement of target
    • G01S17/58—Velocity or trajectory determination systems; Sense-of-movement determination systems

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

PURPOSE:To improve the precision of measurement and follow-up characteristics to a change at high speed, by fitting an optical fiber laser Doppler shift to a mobile body and thereby measuring directly the speed of the mobile body. CONSTITUTION:An optical fiber laser Doppler speedometer having a speed probe wherein a distributed refractive-index type lens 9 and an optical fiber 7b are incorporated is fitted to an electric railcar 5. Beams from a laser 6 are given to the lens 9 through a splitter 12 and emitted to a railroad 16, a body to be measured. Laser beams diffused by the railroad 16 are subjected to a Doppler effect, fall on the speed probe, and are transmitted to a beam receiver 13 via the splitter 12. At the receiver 13, reflected beams and diffused beams are subjected to heterodyne detection, beat frequency signals are given to an indicator 15 via an F-V transducer 14, and thus a value proportional to the speed of the electric railcar 5 is indicated.
JP7300981A 1981-05-14 1981-05-14 Measuring device for speed Pending JPS57187677A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7300981A JPS57187677A (en) 1981-05-14 1981-05-14 Measuring device for speed

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7300981A JPS57187677A (en) 1981-05-14 1981-05-14 Measuring device for speed

Publications (1)

Publication Number Publication Date
JPS57187677A true JPS57187677A (en) 1982-11-18

Family

ID=13505907

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7300981A Pending JPS57187677A (en) 1981-05-14 1981-05-14 Measuring device for speed

Country Status (1)

Country Link
JP (1) JPS57187677A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04264287A (en) * 1990-10-12 1992-09-21 Hughes Aircraft Co True ground speed sensor
EP0615621A1 (en) * 1991-12-06 1994-09-21 Optical Air Data Systems, L.P. Optical doppler velocimeter
JP2017015474A (en) * 2015-06-30 2017-01-19 株式会社日立製作所 Railway vehicle control system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04264287A (en) * 1990-10-12 1992-09-21 Hughes Aircraft Co True ground speed sensor
EP0615621A1 (en) * 1991-12-06 1994-09-21 Optical Air Data Systems, L.P. Optical doppler velocimeter
EP0615621A4 (en) * 1991-12-06 1998-03-04 Optical Air Data Syst Lp Optical doppler velocimeter.
JP2017015474A (en) * 2015-06-30 2017-01-19 株式会社日立製作所 Railway vehicle control system

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