WO1993020458A3 - Laser distance measurement - Google Patents

Laser distance measurement Download PDF

Info

Publication number
WO1993020458A3
WO1993020458A3 PCT/GB1993/000655 GB9300655W WO9320458A3 WO 1993020458 A3 WO1993020458 A3 WO 1993020458A3 GB 9300655 W GB9300655 W GB 9300655W WO 9320458 A3 WO9320458 A3 WO 9320458A3
Authority
WO
WIPO (PCT)
Prior art keywords
retro
reflector
distance measurement
laser
laser distance
Prior art date
Application number
PCT/GB1993/000655
Other languages
French (fr)
Other versions
WO1993020458A2 (en
Inventor
Peter Oakley
Keith Raper
Graham Stewart Brandon Street
Original Assignee
Imatronic 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
Priority claimed from GB929206888A external-priority patent/GB9206888D0/en
Priority claimed from GB929206871A external-priority patent/GB9206871D0/en
Priority claimed from GB929206870A external-priority patent/GB9206870D0/en
Application filed by Imatronic Ltd filed Critical Imatronic Ltd
Publication of WO1993020458A2 publication Critical patent/WO1993020458A2/en
Publication of WO1993020458A3 publication Critical patent/WO1993020458A3/en

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
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
    • 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

Abstract

Laser distance measuring apparatus has an internal reference beam length determined by a retro-reflector which is movable into and out of the beam path. The retro-reflector is opaque relying on specular reflection. This, together with a light trap arrangement, reduces spurious reflections. The laser and detection optics are carried on a shock proof sub-chassis but the retro-reflector is fixed to the housing to retain alignment with an exterior datum. Each distance measurement is sandwiched between reference measurements to maintain accuracy despite drift in the circuitry.
PCT/GB1993/000655 1992-03-30 1993-03-30 Laser distance measurement WO1993020458A2 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
GB9206888.1 1992-03-30
GB929206888A GB9206888D0 (en) 1992-03-30 1992-03-30 Laser distance measuring apparatus
GB9206871.7 1992-03-30
GB929206871A GB9206871D0 (en) 1992-03-30 1992-03-30 Laser distance measurement
GB9206870.9 1992-03-30
GB929206870A GB9206870D0 (en) 1992-03-30 1992-03-30 Laser measurement apparatus

Publications (2)

Publication Number Publication Date
WO1993020458A2 WO1993020458A2 (en) 1993-10-14
WO1993020458A3 true WO1993020458A3 (en) 1993-11-11

Family

ID=27266120

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/000655 WO1993020458A2 (en) 1992-03-30 1993-03-30 Laser distance measurement

Country Status (1)

Country Link
WO (1) WO1993020458A2 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09236662A (en) * 1996-02-29 1997-09-09 Ushikata Shokai:Kk Electronic distance meter
DE50213215D1 (en) 2002-03-18 2009-03-05 Hilti Ag Electro-optical para-axial distance measuring system
JP3908226B2 (en) * 2004-02-04 2007-04-25 日本電産株式会社 Scanning range sensor
DE102005037253A1 (en) 2005-08-08 2007-02-15 Robert Bosch Gmbh gauge
DE102005037251A1 (en) 2005-08-08 2007-02-15 Robert Bosch Gmbh gauge
CN201035148Y (en) * 2007-01-19 2008-03-12 南京德朔实业有限公司 Laser ranging device
CN201035149Y (en) * 2007-01-19 2008-03-12 南京德朔实业有限公司 Laser ranging device
GB2485995B (en) * 2010-11-30 2014-01-01 St Microelectronics Res & Dev Improved proximity sensor and associated method, computer readable medium and firmware
US10145671B2 (en) 2016-03-31 2018-12-04 Topcon Positioning Systems, Inc. Three dimensional laser measuring system and method
US11547905B2 (en) 2018-01-24 2023-01-10 Sony Group Corporation Time-of-flight ranging device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740141A (en) * 1971-09-20 1973-06-19 Laser Systems & Electronics Timing and measuring methods and means for laser distance measurements
CH596559A5 (en) * 1976-10-07 1978-03-15 Kern & Co Ag Electro=optical distance measuring device with modulated light source
EP0439011A2 (en) * 1990-01-26 1991-07-31 Erwin Sick GmbH Optik-Elektronik Distance measurement device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740141A (en) * 1971-09-20 1973-06-19 Laser Systems & Electronics Timing and measuring methods and means for laser distance measurements
CH596559A5 (en) * 1976-10-07 1978-03-15 Kern & Co Ag Electro=optical distance measuring device with modulated light source
EP0439011A2 (en) * 1990-01-26 1991-07-31 Erwin Sick GmbH Optik-Elektronik Distance measurement device

Also Published As

Publication number Publication date
WO1993020458A2 (en) 1993-10-14

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