GB1524830A - Flow measurement apparatus - Google Patents

Flow measurement apparatus

Info

Publication number
GB1524830A
GB1524830A GB4369675A GB4369675A GB1524830A GB 1524830 A GB1524830 A GB 1524830A GB 4369675 A GB4369675 A GB 4369675A GB 4369675 A GB4369675 A GB 4369675A GB 1524830 A GB1524830 A GB 1524830A
Authority
GB
United Kingdom
Prior art keywords
lens
fringes
beams
splitter
oct
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
GB4369675A
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.)
British Aircraft Corp Ltd
Original Assignee
British Aircraft Corp 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 British Aircraft Corp Ltd filed Critical British Aircraft Corp Ltd
Priority to GB4369675A priority Critical patent/GB1524830A/en
Publication of GB1524830A publication Critical patent/GB1524830A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/661—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters using light
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

1524830 Apparatus for producing stationary interference fringes BRITISH AIRCRAFT CORP Ltd 19 Oct 1976 [24 Oct 1975] 43696/75 Heading G2J [Also in Division H4] Apparatus for producing a stationary interference pattern of fringes comprises a coherent light source 11, means 13-15 for extending a light beam 10 therefrom a predetermined amount in one direction normal to the axis of the beam, means 16 to convert the beam into at least three substantially parallel beams 18, and means 19 to focus these beams down to a line of interference fringes or spots 20. The apparatus may comprise cylindrical lenses 13, 14 (or alternatively an astigmatic lens) and a collimating lens 15 to produce the extended beam 12, a beam-splitter 16 and a Fourier lens 19. The beamsplitter may be a glass slab having aluminium coatings 17a (which totally reflects light incident from within the beam-splitter) and 17b (having varying transmission/reflection properties such that beams 18' are of equal intensity); alternatively a slotted mask or a series of plates may be used. It is stated that this arrangement produces a probe volume of smaller dimensions and provides fringes of increased contrast compared with the conventional two-beam anemometer. Light scattered by particles crossing the fringe pattern may be detected by means of a focusing lens and a photo-multiplier tube. The signal-tonoise ratio may be increased by controlled seeding of the flow with aerosol particles, and by providing a mask having an aperture in the shape of the probe volume placed in the image plane of the lens.
GB4369675A 1976-10-19 1976-10-19 Flow measurement apparatus Expired GB1524830A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4369675A GB1524830A (en) 1976-10-19 1976-10-19 Flow measurement apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4369675A GB1524830A (en) 1976-10-19 1976-10-19 Flow measurement apparatus

Publications (1)

Publication Number Publication Date
GB1524830A true GB1524830A (en) 1978-09-13

Family

ID=10429911

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4369675A Expired GB1524830A (en) 1976-10-19 1976-10-19 Flow measurement apparatus

Country Status (1)

Country Link
GB (1) GB1524830A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57190904A (en) * 1981-05-19 1982-11-24 Matsushita Electric Ind Co Ltd Optical waveguide device
US4506979A (en) * 1981-12-08 1985-03-26 Lockheed Corporation Compact radiation fringe velocimeter for measuring in three dimensions
US4537503A (en) * 1981-12-22 1985-08-27 Atomic Energy Of Canada Limited Multiple measuring control volume laser doppler anemometer
WO2003038446A1 (en) * 2001-11-01 2003-05-08 Forskningscenter Risø Optical device and method for measuring velocity
WO2006100421A1 (en) * 2005-03-22 2006-09-28 The Boc Group Plc Method of monitoring a freeze drying process
CN105938977A (en) * 2016-07-12 2016-09-14 西安炬光科技股份有限公司 Method and system for forming linear light spots

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57190904A (en) * 1981-05-19 1982-11-24 Matsushita Electric Ind Co Ltd Optical waveguide device
US4506979A (en) * 1981-12-08 1985-03-26 Lockheed Corporation Compact radiation fringe velocimeter for measuring in three dimensions
US4537503A (en) * 1981-12-22 1985-08-27 Atomic Energy Of Canada Limited Multiple measuring control volume laser doppler anemometer
WO2003038446A1 (en) * 2001-11-01 2003-05-08 Forskningscenter Risø Optical device and method for measuring velocity
WO2006100421A1 (en) * 2005-03-22 2006-09-28 The Boc Group Plc Method of monitoring a freeze drying process
CN105938977A (en) * 2016-07-12 2016-09-14 西安炬光科技股份有限公司 Method and system for forming linear light spots

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee