GB2075787B - Measuring velocity by doppler shift of laser radiation - Google Patents

Measuring velocity by doppler shift of laser radiation

Info

Publication number
GB2075787B
GB2075787B GB8110828A GB8110828A GB2075787B GB 2075787 B GB2075787 B GB 2075787B GB 8110828 A GB8110828 A GB 8110828A GB 8110828 A GB8110828 A GB 8110828A GB 2075787 B GB2075787 B GB 2075787B
Authority
GB
United Kingdom
Prior art keywords
laser
laser radiation
doppler shift
frequency
detector
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.)
Expired
Application number
GB8110828A
Other versions
GB2075787A (en
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB8110828A priority Critical patent/GB2075787B/en
Publication of GB2075787A publication Critical patent/GB2075787A/en
Application granted granted Critical
Publication of GB2075787B publication Critical patent/GB2075787B/en
Expired 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
    • 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
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
    • 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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/491—Details of non-pulse systems
    • G01S7/4911—Transmitters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01W—METEOROLOGY
    • G01W1/00—Meteorology
    • G01W2001/003—Clear air turbulence detection or forecasting, e.g. for aircrafts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

Landscapes

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

Abstract

A laser doppler velocity measuring system in which a CO2 laser 4 illuminates a volume 2 of interest in the atmosphere, and laser radiation reflected off particles in this volume 2 is mixed on a detector 11 with a local oscillator signal direct from the laser 4, is characterised in that the laser frequency is locked to a desired frequency, e.g. the P20 line, by a feedback signal derived via a highly selective etalon filter 14, whereby the laser cavity is adjusted to give maximum local oscillator signal on the detector 11, which corresponds to the wanted frequency. <IMAGE>
GB8110828A 1980-04-09 1981-04-07 Measuring velocity by doppler shift of laser radiation Expired GB2075787B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8110828A GB2075787B (en) 1980-04-09 1981-04-07 Measuring velocity by doppler shift of laser radiation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8011740 1980-04-09
GB8110828A GB2075787B (en) 1980-04-09 1981-04-07 Measuring velocity by doppler shift of laser radiation

Publications (2)

Publication Number Publication Date
GB2075787A GB2075787A (en) 1981-11-18
GB2075787B true GB2075787B (en) 1984-09-05

Family

ID=26275109

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8110828A Expired GB2075787B (en) 1980-04-09 1981-04-07 Measuring velocity by doppler shift of laser radiation

Country Status (1)

Country Link
GB (1) GB2075787B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3144805C2 (en) * 1981-11-11 1986-09-11 Messerschmitt-Bölkow-Blohm GmbH, 8012 Ottobrunn Process for measuring relative movements by means of laser radiation according to the Doppler radar principle
FR2532046B1 (en) * 1982-08-17 1986-01-17 Cilas Alcatel APPARATUS FOR DETERMINING THE DIFFERENCE OF THE OPTICAL FREQUENCIES OF TWO RADIATIONS AND APPLICATION TO A LASER DEVICE FOR DETERMINING THE MOVEMENT OF A MOBILE TARGET
GB2154787B (en) * 1984-01-17 1987-04-01 Standard Telephones Cables Ltd Laser stabilisation circuit
US4651017A (en) * 1985-02-08 1987-03-17 The United States Of America As Represented By The United States Department Of Energy Wind energy conversion system
FR2592485B1 (en) * 1985-12-31 1988-06-24 Brown De Colstoun Francois STATION FOR THE DETECTION AND LOCATION, BY LASER RAYS OF AN OBJECT OR OF A SUBSTANCE CAPABLE OF BACK BROADCASTING AT LEAST A PART OF THE INCIDENT LASER RAY AND A SYSTEM FOR DETECTING A SUBSTANCE SUCH AS FUME, PARTICULARLY FIRE ESPECIALLY FORESTS.
US4875770A (en) * 1987-03-23 1989-10-24 Lockheed Corporation Wind shear detector
US5394238A (en) * 1992-11-09 1995-02-28 Honeywell Inc. Look-ahead windshear detector by filtered Rayleigh and/or aerosol scattered light

Also Published As

Publication number Publication date
GB2075787A (en) 1981-11-18

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee