GB1477201A - Laser range finders - Google Patents

Laser range finders

Info

Publication number
GB1477201A
GB1477201A GB341674A GB341674A GB1477201A GB 1477201 A GB1477201 A GB 1477201A GB 341674 A GB341674 A GB 341674A GB 341674 A GB341674 A GB 341674A GB 1477201 A GB1477201 A GB 1477201A
Authority
GB
United Kingdom
Prior art keywords
target
polarization
echo
unchanged
wave plate
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
GB341674A
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.)
Ferranti International PLC
Original Assignee
Ferranti PLC
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 Ferranti PLC filed Critical Ferranti PLC
Priority to GB341674A priority Critical patent/GB1477201A/en
Priority to FR7501752A priority patent/FR2259372B1/fr
Priority to SE7500639A priority patent/SE7500639L/xx
Priority to NO750193A priority patent/NO750193L/no
Priority to DE19752502662 priority patent/DE2502662A1/en
Publication of GB1477201A publication Critical patent/GB1477201A/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
    • 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
    • G01S7/499—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00 using polarisation effects

Landscapes

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

Abstract

1477201 Radar FERRANTI Ltd 16 Jan 1975 [24 Jan 1974] 3416/74 Heading H4D In a pulsed laser radar, the sensitivity of the echo detection and the degree of protection from echoes from clouds &c. in front of the target, are both improved by making the transmitted pulse radiation distinctively polarized and passing the echo pulses to the detector through polarization selective optics. An IR Q-switched laser 10 passes its beam through a Nicol prism 12 to a “ wave plate 13 which changes the polarization to circular and telescopic optics 14, 15 directs the circularly polarized beam to the target X. If no cloud or mist intervenes, 20-40% of the reflected light has its polarization orthogonally changed, leaving 80-60% unchanged. The unchanged echo-portion is converted back to linear polarized radiation perpendicular to the transmitted plane by the “ wave plate, to be deflected by prism 12 to detector 17. If it is known that cloud or mist is present, giving spurious echoes having unchanged polarization, the “ wave plate 13 is removed so that the 20-40% changed portion of the "true" target echo is detected. The IR laser beam is reflected to the target X by beam splitter 31, an observer 32 viewing the target through the beam splitter 31, which reflects IR but transmits light, and an IR safety filter 33.
GB341674A 1974-01-24 1974-01-24 Laser range finders Expired GB1477201A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB341674A GB1477201A (en) 1974-01-24 1974-01-24 Laser range finders
FR7501752A FR2259372B1 (en) 1974-01-24 1975-01-21
SE7500639A SE7500639L (en) 1974-01-24 1975-01-21
NO750193A NO750193L (en) 1974-01-24 1975-01-22
DE19752502662 DE2502662A1 (en) 1974-01-24 1975-01-23 LASER DISTANCE METER

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB341674A GB1477201A (en) 1974-01-24 1974-01-24 Laser range finders

Publications (1)

Publication Number Publication Date
GB1477201A true GB1477201A (en) 1977-06-22

Family

ID=9757932

Family Applications (1)

Application Number Title Priority Date Filing Date
GB341674A Expired GB1477201A (en) 1974-01-24 1974-01-24 Laser range finders

Country Status (5)

Country Link
DE (1) DE2502662A1 (en)
FR (1) FR2259372B1 (en)
GB (1) GB1477201A (en)
NO (1) NO750193L (en)
SE (1) SE7500639L (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2228566A (en) * 1988-12-16 1990-08-29 Marconi Gec Ltd Infra-red sensors
US5719664A (en) * 1994-10-04 1998-02-17 Commissariat A L'energie Atomique Telemetry device having a microlaser
US8441621B2 (en) 2008-01-31 2013-05-14 Swarovski-Optik Kg. Observation device with range finder
CN109737917A (en) * 2019-03-07 2019-05-10 东莞中子科学中心 Image distance measuring instrument and measurement method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT378267B (en) * 1983-09-28 1985-07-10 Voest Alpine Ag LASER DOPPLER SPEED MEASURING HEAD
DE3719235A1 (en) * 1987-06-09 1988-12-22 Messerschmitt Boelkow Blohm Method and device for suppressing the influence of accidental reflections on a target which is marked with reflectors
KR940011331B1 (en) * 1992-03-18 1994-12-05 한국과학기술원 Laser distance sensor used non-linear crystal
GB2547891A (en) 2016-02-22 2017-09-06 Ma Cuisine Originale Ltd Improvements in or relating to handheld food products

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2228566A (en) * 1988-12-16 1990-08-29 Marconi Gec Ltd Infra-red sensors
US5719664A (en) * 1994-10-04 1998-02-17 Commissariat A L'energie Atomique Telemetry device having a microlaser
US8441621B2 (en) 2008-01-31 2013-05-14 Swarovski-Optik Kg. Observation device with range finder
US8525978B2 (en) 2008-01-31 2013-09-03 Swarovski-Optik Kg. Observation device with a distance meter
US8953150B2 (en) 2008-01-31 2015-02-10 Swarovski-Optik Kg. Observation device with range finder
US9146102B2 (en) 2008-01-31 2015-09-29 Swarovski-Optik Kg. Observation device with range finder
US9410803B2 (en) 2008-01-31 2016-08-09 Swarovski-Optik Kg. Observation device with a range finder
US9593946B2 (en) 2008-01-31 2017-03-14 Swarovski-Optik Kg. Observation device with a distance meter
US9719780B2 (en) 2008-01-31 2017-08-01 Swarovski-Optik Kg. Observation device with a range finder
US10520306B2 (en) 2008-01-31 2019-12-31 Swarovski-Optik Kg. Observation device with a distance meter
US11460296B2 (en) 2008-01-31 2022-10-04 Swarovski-Optik Kg Observation device with a distance meter
CN109737917A (en) * 2019-03-07 2019-05-10 东莞中子科学中心 Image distance measuring instrument and measurement method

Also Published As

Publication number Publication date
NO750193L (en) 1975-08-18
FR2259372A1 (en) 1975-08-22
DE2502662A1 (en) 1975-08-14
SE7500639L (en) 1975-07-25
FR2259372B1 (en) 1980-10-17

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19950115