EP1234159A1 - Ein optischer positionsdetektor - Google Patents

Ein optischer positionsdetektor

Info

Publication number
EP1234159A1
EP1234159A1 EP00977736A EP00977736A EP1234159A1 EP 1234159 A1 EP1234159 A1 EP 1234159A1 EP 00977736 A EP00977736 A EP 00977736A EP 00977736 A EP00977736 A EP 00977736A EP 1234159 A1 EP1234159 A1 EP 1234159A1
Authority
EP
European Patent Office
Prior art keywords
target
scale
pattern
optical axis
image processing
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.)
Withdrawn
Application number
EP00977736A
Other languages
English (en)
French (fr)
Inventor
John Instro Precision Limited MORCOM
Ralph Instro Precision Limited APPERLEY
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.)
Instro Precision Ltd
Original Assignee
Instro Precision 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 Instro Precision Ltd filed Critical Instro Precision Ltd
Publication of EP1234159A1 publication Critical patent/EP1234159A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
    • G01B11/27—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
    • G01B11/272—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes using photoelectric detection means

Definitions

  • the present invention relates to an optical position detector, in particular for measuring the
  • Optical position detectors are typically used to enable the displacement of an object to be
  • Figure 1 shows an example of a conventional optical position detector.
  • the system includes a
  • target 2 target 2
  • target holder 4 target holder 4
  • alignment telescope 6 An operator 8 views the target 2 through
  • the telescope defines an image line of sight 13 and an object line of
  • the target holder 4 holds the target 2 in a precise spatial relationship to the object (not
  • the displacement D of the target and hence the object is proportional to the angle ⁇
  • Alignment telescopes have been in use for many years and have proven to be a reliable means of
  • magnification of the alignment telescopes varies significantly with focus over the
  • an optical position detector comprising:
  • the target has a pattern of lines defining a
  • processing system is arranged to receive an image of the target and determine therefrom the location of the object relative to said optical axis.
  • the present invention provides a position detector using a target with a scale whose criticality
  • the image processing system can thus compute
  • the scaling factor between the measured image size (which may be in units of number of pixels of
  • the image sensor and known, real world, image size and use this scaling factor to determine the
  • the target is positioned in a known relationship relative to the object.
  • the pattern may be a plurality of concentric shapes, and any adjacent pair of shapes can then
  • the shapes can be identified uniquely, and the real dimensions can then be known
  • the image processing system if the target is on a far away object, the image processing system
  • Each shape also defines the fixed point on the target, for example the centre of the concentric
  • the shapes preferably comprise circles and the image processing system is arranged to image at
  • the image processing system preferably measures an offset between the optical axis and an
  • the invention also provides a method of measuring the offset of an object from an optical axis
  • magnification is required because the system is self calibrating. Furthermore, the system can
  • Figure 1 shows an example of a conventional optical position detector
  • Figure 2 shows an example of a control system used in the optical position detector
  • Figure 3 shows an optical position detector according to the present invention
  • Figure 4 shows a scaled pattern used on a target used in an optical position detector
  • Figure 5 shows a table of values used in the optical position detector of the present
  • Figure 3 shows an example of an optical position detector for measuring the displacement of an
  • the system has a target 18 and an image processing system 20 having an optical axis 16.
  • the target 18 and an image processing system 20 having an optical axis 16.
  • the image processing system is arranged to
  • the target may reflect
  • ambient light or it may be transmissive and a light source may then be provided behind the
  • the target 18 has a scaled pattern arranged on its surface which faces the optical processing
  • Figure 4 shows an example of a scaled pattern used on the target used in the optical position
  • the pattern has a number of concentric rings 22
  • the diameter of the circular edge of one ring (either a light to
  • the image processing system measures the diameters of the
  • the ratio of the diameters of the two rings enables the system to detect which of the concentric
  • Centroiding software enables the centre of the pattern to be obtained with high accuracy.
  • the image of the target is obtained by the image processing system 20, and a measurement
  • consecutive circles in the pattern may be detected (e.g. black to white boundary and white to
  • pixels from the centre of the camera optical axis (or some other useful datum in the field of view)
  • the distance of the target from the imaging system does not matter.
  • the distance of the target from the imaging system does not matter.
  • pattern for the target could be employed, including for example,
  • This system can be used in the alignment of a number of objects where it is required that they are
  • the system could be used to arrange a series of elements such as
  • the optical axis may for example be defined by aligning the optical system with the first and the
  • the target image is projected onto a reflective surface through a
  • the reflected image is collected by the telescope and viewed through a beam splitter.
  • the displacement of the reflected image which is dependant upon the rotation of the
  • reflective surface to the instrument line of sight can then be measured using an appropriate target and processing system.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
EP00977736A 1999-11-26 2000-11-24 Ein optischer positionsdetektor Withdrawn EP1234159A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9928124.8A GB9928124D0 (en) 1999-11-26 1999-11-26 An optical position detector
GB9928124 1999-11-26
PCT/GB2000/004496 WO2001038823A1 (en) 1999-11-26 2000-11-24 An optical position detector

Publications (1)

Publication Number Publication Date
EP1234159A1 true EP1234159A1 (de) 2002-08-28

Family

ID=10865311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00977736A Withdrawn EP1234159A1 (de) 1999-11-26 2000-11-24 Ein optischer positionsdetektor

Country Status (4)

Country Link
EP (1) EP1234159A1 (de)
AU (1) AU1537101A (de)
GB (1) GB9928124D0 (de)
WO (1) WO2001038823A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6704102B2 (en) * 2001-02-06 2004-03-09 Metronics, Inc. Calibration artifact and method of using the same
GB2376533A (en) * 2001-06-14 2002-12-18 Instro Prec Ltd Multi position alignment system
GB0622451D0 (en) * 2006-11-10 2006-12-20 Intelligent Earth Ltd Object position and orientation detection device
FR2946738B1 (fr) * 2009-06-10 2011-08-19 Electricite De France Aide a la visee, pour des competitions sportives, de personnes mal voyantes ou non voyantes.
GB201317205D0 (en) * 2013-09-27 2013-11-13 Omarco Network Solutions Ltd Product verification method
US10475203B2 (en) 2018-02-06 2019-11-12 Saudi Arabian Oil Company Computer vision system and method for tank calibration using optical reference line method
GB2574064B (en) * 2018-05-25 2020-05-27 Imetrum Ltd Motion encoder

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4155648A (en) * 1978-04-07 1979-05-22 United States Steel Corporation Optical pipe end-squareness gauge
SE411686B (sv) * 1978-05-31 1980-01-28 Bergkvist Lars A Anordning for indikering av en vinkel eller riktning vid rorleggning eller motsvarande
US5724743A (en) * 1992-09-04 1998-03-10 Snap-On Technologies, Inc. Method and apparatus for determining the alignment of motor vehicle wheels
US5974365A (en) * 1997-10-23 1999-10-26 The United States Of America As Represented By The Secretary Of The Army System for measuring the location and orientation of an object

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0138823A1 *

Also Published As

Publication number Publication date
WO2001038823A1 (en) 2001-05-31
GB9928124D0 (en) 2000-01-26
AU1537101A (en) 2001-06-04

Similar Documents

Publication Publication Date Title
US6310644B1 (en) Camera theodolite system
Clarke et al. The development of camera calibration methods and models
AU2011334864B9 (en) Robotic surveying instrument and method for the automated autocollimation of a telescope of a surveying instrument comprising an autocollimation target
KR100654248B1 (ko) 편심측정방법 및 편심측정장치
CN110057552B (zh) 虚像距离测量方法、装置、设备以及控制器和介质
US6122078A (en) Self calibrating scanner with single or multiple detector arrays and single or multiple optical systems
El-Hakim et al. Comparative evaluation of the performance of passive and active 3D vision systems
US9228858B2 (en) Rotation angle detecting apparatus
CN108917602B (zh) 一种全景结构光视觉测量系统及通用畸变模型参数标定方法
CN110501026B (zh) 基于阵列星点的相机内方位元素标定装置及方法
CN110274581B (zh) 全站仪、确定全站仪的仪器误差的方法和机器可读介质
CN103162674B (zh) 测量仪
CN110108203B (zh) 一种基于摄影测量技术的丝线位置测量方法及系统
EP1234159A1 (de) Ein optischer positionsdetektor
RU2635336C2 (ru) Способ калибровки оптико-электронного аппарата и устройство для его осуществления
Beyer Advances in characterisation and calibration of digital imaging systems
Bergues et al. Uncertainty determination of the set nikon 6b autocollimator+ visual interface
RU2579532C2 (ru) Оптико-электронный стереоскопический дальномер
US6121999A (en) Eliminating routine alignment calibrations in perspective dimensional measurements
Clark et al. Measuring range using a triangulation sensor with variable geometry
CN108286960A (zh) 聚焦式光管阵列装置以及摄影检测方法
RU98596U1 (ru) Двухканальный цифровой автоколлиматор
Harding et al. Calibration methods for 3D measurement systems
Sinnreich et al. Optical 3D tube measurement system for quality control in industry
Hedstrand et al. Improving Photogrammetry Instrument Performance through Camera Calibration for Precision Digital Manufacturing

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20020613

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MORCOM, CHRISTOPHER JOHN,INSTRO PRECISION LIMITED

Inventor name: APPERLEY, RALPH,INSTRO PRECISION LIMITED

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20061208