GB2200810B - Optical proximity detector - Google Patents

Optical proximity detector

Info

Publication number
GB2200810B
GB2200810B GB8701969A GB8701969A GB2200810B GB 2200810 B GB2200810 B GB 2200810B GB 8701969 A GB8701969 A GB 8701969A GB 8701969 A GB8701969 A GB 8701969A GB 2200810 B GB2200810 B GB 2200810B
Authority
GB
United Kingdom
Prior art keywords
detector
proximity detector
oscillator
phase
optical proximity
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 - Fee Related
Application number
GB8701969A
Other versions
GB2200810A (en
GB8701969D0 (en
Inventor
George Malcolm Swift Joynes
John Mansbridge
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.)
GEC AEROSPACE Ltd
Plessey Co Ltd
Original Assignee
GEC AEROSPACE Ltd
Plessey Co 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 GEC AEROSPACE Ltd, Plessey Co Ltd filed Critical GEC AEROSPACE Ltd
Priority to GB8701969A priority Critical patent/GB2200810B/en
Publication of GB8701969D0 publication Critical patent/GB8701969D0/en
Publication of GB2200810A publication Critical patent/GB2200810A/en
Application granted granted Critical
Publication of GB2200810B publication Critical patent/GB2200810B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G01S17/32—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
    • G01S17/36—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated with phase comparison between the received signal and the contemporaneously transmitted signal
    • 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
    • G01S7/491—Details of non-pulse systems
    • G01S7/4912—Receivers
    • G01S7/4915—Time delay measurement, e.g. operational details for pixel components; Phase measurement

Abstract

A proximity detector comprises a LED 4 which is driven by an oscillator 1 such that light pulses are directed towards a surface 7 whose distance from the detector is required to be measured, a photodiode 9 receiving light pulses reflected from surface 7 and producing a corresponding electrical signal, a phase detectors 13 giving I and Q phase differences between a signal received directly or via 90 DEG C phase shifter 14 from said oscillator 1 and that reflected from said surface 7, said phase differences being representative of the path length between transmitter and receiver. The detector may be used as an optical altimeter. <IMAGE>
GB8701969A 1987-01-29 1987-01-29 Optical proximity detector Expired - Fee Related GB2200810B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8701969A GB2200810B (en) 1987-01-29 1987-01-29 Optical proximity detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8701969A GB2200810B (en) 1987-01-29 1987-01-29 Optical proximity detector

Publications (3)

Publication Number Publication Date
GB8701969D0 GB8701969D0 (en) 1987-03-04
GB2200810A GB2200810A (en) 1988-08-10
GB2200810B true GB2200810B (en) 1991-11-06

Family

ID=10611399

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8701969A Expired - Fee Related GB2200810B (en) 1987-01-29 1987-01-29 Optical proximity detector

Country Status (1)

Country Link
GB (1) GB2200810B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5317375A (en) * 1991-02-28 1994-05-31 Stanley Electric Co., Ltd. Optical distance measuring apparatus
JP3523368B2 (en) * 1995-05-12 2004-04-26 ペンタックス株式会社 Lightwave rangefinder
CN104339288B (en) * 2013-08-05 2016-07-06 哈尔滨飞机工业集团有限责任公司 A kind of vapour-pressure type altimeter fixture

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1104021A (en) * 1963-11-11 1968-02-21 Nat Res Dev Distance measuring apparatus
GB1294874A (en) * 1969-09-03 1972-11-01
US3779645A (en) * 1970-05-20 1973-12-18 Nippon Kogaku Kk Distance measuring device
US3888588A (en) * 1972-02-03 1975-06-10 Granqvist Carl Erik Instrument for measuring distance
US4274736A (en) * 1978-10-11 1981-06-23 Kern & Co. Ag Method and apparatus for electrooptical distance measurement
US4560270A (en) * 1981-08-07 1985-12-24 Geotronics Ab Device included in a distance meter system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1104021A (en) * 1963-11-11 1968-02-21 Nat Res Dev Distance measuring apparatus
GB1136567A (en) * 1963-11-11 1968-12-11 Nat Res Dev Distance measuring apparatus
GB1294874A (en) * 1969-09-03 1972-11-01
US3779645A (en) * 1970-05-20 1973-12-18 Nippon Kogaku Kk Distance measuring device
US3888588A (en) * 1972-02-03 1975-06-10 Granqvist Carl Erik Instrument for measuring distance
US4274736A (en) * 1978-10-11 1981-06-23 Kern & Co. Ag Method and apparatus for electrooptical distance measurement
US4560270A (en) * 1981-08-07 1985-12-24 Geotronics Ab Device included in a distance meter system

Also Published As

Publication number Publication date
GB2200810A (en) 1988-08-10
GB8701969D0 (en) 1987-03-04

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20050129