GB1304547A - - Google Patents

Info

Publication number
GB1304547A
GB1304547A GB1304547DA GB1304547A GB 1304547 A GB1304547 A GB 1304547A GB 1304547D A GB1304547D A GB 1304547DA GB 1304547 A GB1304547 A GB 1304547A
Authority
GB
United Kingdom
Prior art keywords
lens
mask
light
focus
refracted
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
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 filed Critical
Publication of GB1304547A publication Critical patent/GB1304547A/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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
    • G01P3/366—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light by using diffraction of 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
    • 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)
  • Electromagnetism (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Power Engineering (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

1304547 Photoelectric speed measurement SHELL INTERNATIONAL RESEARCH MAATSCHAPPIJ NV 13 April 1970 17510/70 Heading H4D The speed of a moving surface is measured by splitting a beam of monochromatic plane polarized light into two beams, which are caused to overlap on the surface and detecting the rate of variation of the intensity of the light reflect from the surface. In a ship's log, a beam of light from an argon laser 1 is split into two parallel beams 3, 4 and these are refracted by lens 6 mounted in the hull 7, to intersect at the focus 8 in the sea water. The output of a photomultiplier 12 is connected to a frequency analyser 13, e.g. oscilloscope or computer. Mask 11 is provided at the focus of lens 10 to shield the detector from stray light. The mask 11 is positioned by inserting a bi-prism (14) into beam 3 between lenses 6 and 10. This produces a beam parallel to beam 3 near the axis of lens 10 and directed in the opposite direction. The aperture in mask 11 is then positioned to allow the beam refracted through lens 10 to pass through. (Fig. 3, not shown). The output of the analyser 13 may be connected to a computer which averages the Doppler frequency over a period of time, e.g. 15 minutes, to reduce the effects of turbulence. The system may also be applied to measuring the velocity of material, e.g. metal strip, fabric, plastic during manufacture. Reference has been directed by the Comptroller to Specification 1,249,540.
GB1304547D 1970-04-13 1970-04-13 Expired GB1304547A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1751070 1970-04-13

Publications (1)

Publication Number Publication Date
GB1304547A true GB1304547A (en) 1973-01-24

Family

ID=10096466

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1304547D Expired GB1304547A (en) 1970-04-13 1970-04-13

Country Status (2)

Country Link
GB (1) GB1304547A (en)
NO (1) NO127263B (en)

Also Published As

Publication number Publication date
NO127263B (en) 1973-05-28

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees