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WO1999035519A3 - Modulated filtered rayleigh scattering - Google Patents

Modulated filtered rayleigh scattering Download PDF

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Publication number
WO1999035519A3
WO1999035519A3 PCT/US1999/000691 US9900691W WO9935519A3 WO 1999035519 A3 WO1999035519 A3 WO 1999035519A3 US 9900691 W US9900691 W US 9900691W WO 9935519 A3 WO9935519 A3 WO 9935519A3
Authority
WO
WIPO (PCT)
Prior art keywords
scattered light
modulated
rayleigh scattering
laser
fluid
Prior art date
Application number
PCT/US1999/000691
Other languages
French (fr)
Other versions
WO1999035519A2 (en
Inventor
Philip L Varghese
Original Assignee
Univ Texas
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 Univ Texas filed Critical Univ Texas
Priority to AU24556/99A priority Critical patent/AU2455699A/en
Publication of WO1999035519A2 publication Critical patent/WO1999035519A2/en
Publication of WO1999035519A3 publication Critical patent/WO1999035519A3/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/26—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
    • 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

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

A system and process for measuring velocity of a fluid, such as a supersonic gas jet (44), is disclosed. The system employs modulated laser light (14) from a tunable diode laser (12). By modulated it is meant that the laser is dithered. Scattered light (48) is collected and passed through a cell (50) containing, for example, rubidium. The pattern of the scattered light is compared to a reference standard (18, 20). The Doppler shift of the scattered light versus the reference provides data that is used to calculate the velocity of the fluid.
PCT/US1999/000691 1998-01-12 1999-01-12 Modulated filtered rayleigh scattering WO1999035519A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU24556/99A AU2455699A (en) 1998-01-12 1999-01-12 Modulated filtered rayleigh scattering

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7125098P 1998-01-12 1998-01-12
US60/071,250 1998-01-12

Publications (2)

Publication Number Publication Date
WO1999035519A2 WO1999035519A2 (en) 1999-07-15
WO1999035519A3 true WO1999035519A3 (en) 1999-09-30

Family

ID=22100191

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/000691 WO1999035519A2 (en) 1998-01-12 1999-01-12 Modulated filtered rayleigh scattering

Country Status (2)

Country Link
AU (1) AU2455699A (en)
WO (1) WO1999035519A2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8072584B2 (en) 2002-08-02 2011-12-06 Ophir Corporation Optical air data systems and methods
US7564539B2 (en) 2002-08-02 2009-07-21 Ophir Corporation Optical air data systems and methods
EP1525484B1 (en) 2002-08-02 2007-05-02 Ophir Corporation Optical air data measurement system and method
DE102005028268B4 (en) 2005-06-14 2013-12-12 Forschungsverbund Berlin E.V. Method and apparatus for generating and detecting a Raman spectrum
DE102009042404B3 (en) * 2009-09-16 2011-04-14 Technische Universität Dresden A method of determining the velocity of a moving fluid using self-calibration of a laser frequency modulation Doppler Global Velocimeter
GB2532585B (en) * 2013-06-30 2018-04-25 Wind Farm Analytics Ltd Turbine fluid velocity field measurement
US9334807B2 (en) 2014-05-13 2016-05-10 The Boeing Company Methods and apparatus to determine airflow conditions at an inlet of an engine
DE202016102010U1 (en) * 2016-04-15 2017-07-18 Deutsches Zentrum für Luft- und Raumfahrt e.V. aircraft
CN113176582B (en) * 2021-04-27 2023-07-18 厦门大学 A flow velocity detection lidar and flow velocity detection method based on dual-frequency pumping

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4919536A (en) * 1988-06-06 1990-04-24 Northrop Corporation System for measuring velocity field of fluid flow utilizing a laser-doppler spectral image converter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4919536A (en) * 1988-06-06 1990-04-24 Northrop Corporation System for measuring velocity field of fluid flow utilizing a laser-doppler spectral image converter

Also Published As

Publication number Publication date
AU2455699A (en) 1999-07-26
WO1999035519A2 (en) 1999-07-15

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