GB1349365A – Laser doppler velocimeter
– Google Patents
GB1349365A – Laser doppler velocimeter
– Google Patents
Laser doppler velocimeter
Info
Publication number
GB1349365A
GB1349365A
GB1747771A
GB1747771A
GB1349365A
GB 1349365 A
GB1349365 A
GB 1349365A
GB 1747771 A
GB1747771 A
GB 1747771A
GB 1747771 A
GB1747771 A
GB 1747771A
GB 1349365 A
GB1349365 A
GB 1349365A
Authority
GB
United Kingdom
Prior art keywords
beams
detector
doppler
fluid
directing
Prior art date
1970-05-29
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
GB1747771A
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.)
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
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.)
1970-05-29
Filing date
1971-05-27
Publication date
1974-04-03
1971-05-27
Application filed by BBC Brown Boveri AG Switzerland, BBC Brown Boveri France SA
filed
Critical
BBC Brown Boveri AG Switzerland
1974-04-03
Publication of GB1349365A
publication
Critical
patent/GB1349365A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
Abstract
1349365 Detecting fluid velocity BBC BROWN BOVERI & CO Ltd 27 May 1971 [29 May 1970] 17477/71 Heading H4D A laser Doppler velocimeter for determining the velocity Fig. 3, of an area of fluid, comprises a laser producing a single beam, an optical system, e.g. mirrors S 1 , S 2 and Kosters prism P, splitting the beam into two parallel beams I and II, an objective L 1 focusing and directing the beams on to the investigated area of fluid and also receiving back the Doppler frequency shifted scattered light and directing it, via focusing lens L 2 , aperture plate B 1 , lens L 3 and interference filter F, on to a photomultiplier detector Ph. By this arrangement, all the elements are coaxial and compactness is achieved. If k i1 and k i2 are the vectors of the beams I and II, k i1 and k i2 are the corresponding unit vectors, the Doppler frequency shifts of the beams are # d1 and # d2 and the wavelength of the incident beam is # 0 , then the output of the photo-detector Ph, contains a Doppler difference frequency component ##d given by the scalar product The photo-detector may be a semi-conductor diode. The beam splitter may be a thick plate PG, Fig. 4, having half silver half-face HV and full silvered half-face V. Beam II result from the passage of the incident beam through the plate and beam I from reflection on faces HV and V.
GB1747771A
1970-05-29
1971-05-27
Laser doppler velocimeter
Expired
GB1349365A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
CH804770A
CH516800A
(en)
1970-05-29
1970-05-29
Method for measuring the speed in flow fields by means of a laser Doppler probe that evaluates light scattered backwards
Publications (1)
Publication Number
Publication Date
GB1349365A
true
GB1349365A
(en)
1974-04-03
Family
ID=4334320
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1747771A
Expired
GB1349365A
(en)
1970-05-29
1971-05-27
Laser doppler velocimeter
Country Status (7)
Country
Link
US
(1)
US3832059A
(en)
CA
(1)
CA953395A
(en)
CH
(1)
CH516800A
(en)
DE
(1)
DE2043290A1
(en)
FR
(1)
FR2090365B1
(en)
GB
(1)
GB1349365A
(en)
NL
(1)
NL7107293A
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4166695A
(en)
*
1976-04-01
1979-09-04
National Research Development Corporation
Method and apparatus for measuring retinal blood flow
Families Citing this family (8)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE2643616C3
(en)
*
1976-09-28
1979-05-31
Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch
Flow rate meter
US4263002A
(en)
*
1979-04-20
1981-04-21
Tsi Incorporated
Differential doppler technique for on-axis backscatter measurements
US4259009A
(en)
*
1979-07-30
1981-03-31
The United States Of America As Represented By The Secretary Of The Navy
Far field target designators
US4396943A
(en)
*
1981-06-10
1983-08-02
Lord David E
Video flowmeter
DE3132526C2
(en)
*
1981-08-18
1984-11-15
Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5000 Köln
Method and device for measuring transit time differences of ultrasonic pulses for determining flow fields, in particular of velocity components in gaseous media
US5865871A
(en)
*
1996-10-01
1999-02-02
Laser Metric, Inc.
Laser-based forward scatter liquid flow meter
AU2001290568A1
(en)
2000-08-25
2002-03-04
Amnis Corporation
Measuring the velocity of small moving objects such as cells
US6875973B2
(en)
*
2000-08-25
2005-04-05
Amnis Corporation
Auto focus for a flow imaging system
Family Cites Families (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB1182658A
(en)
*
1967-10-04
1970-03-04
British Aircraft Corp Ltd
Improvements relating to the Measurement of Fluid or Surface Velocities
1970
1970-05-29
CH
CH804770A
patent/CH516800A/en
not_active
IP Right Cessation
1970-09-01
DE
DE19702043290
patent/DE2043290A1/en
active
Pending
1971
1971-05-26
CA
CA113,985A
patent/CA953395A/en
not_active
Expired
1971-05-26
FR
FR7119036A
patent/FR2090365B1/fr
not_active
Expired
1971-05-27
GB
GB1747771A
patent/GB1349365A/en
not_active
Expired
1971-05-27
NL
NL7107293A
patent/NL7107293A/xx
unknown
1973
1973-06-05
US
US00367148A
patent/US3832059A/en
not_active
Expired – Lifetime
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4166695A
(en)
*
1976-04-01
1979-09-04
National Research Development Corporation
Method and apparatus for measuring retinal blood flow
Also Published As
Publication number
Publication date
NL7107293A
(en)
1971-12-01
CH516800A
(en)
1971-12-15
US3832059A
(en)
1974-08-27
DE2043290A1
(en)
1971-12-09
CA953395A
(en)
1974-08-20
FR2090365A1
(en)
1972-01-14
FR2090365B1
(en)
1976-07-23
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Legal Events
Date
Code
Title
Description
1974-08-14
PS
Patent sealed [section 19, patents act 1949]
1977-12-21
PLNP
Patent lapsed through nonpayment of renewal fees
