GB2016141A - Photodetector system - Google Patents

Photodetector system

Info

Publication number
GB2016141A
GB2016141A GB7907591A GB7907591A GB2016141A GB 2016141 A GB2016141 A GB 2016141A GB 7907591 A GB7907591 A GB 7907591A GB 7907591 A GB7907591 A GB 7907591A GB 2016141 A GB2016141 A GB 2016141A
Authority
GB
United Kingdom
Prior art keywords
range
present
detection
ambient light
source
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Withdrawn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
GB7907591A
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.)
Kasper Instruments Inc
Original Assignee
Kasper Instruments Inc
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 Kasper Instruments Inc filed Critical Kasper Instruments Inc
Publication of GB2016141A publication Critical patent/GB2016141A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/28—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with deflection of beams of light, e.g. for direct optical indication
    • G01D5/30—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with deflection of beams of light, e.g. for direct optical indication the beams of light being detected by photocells
    • 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
    • G01S17/04—Systems determining the presence of a target

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

Detection of an object within a selected range is achieved despite variations in surface condition or reflectivity of the objects and despite changes in ambient light conditions to which the system may be exposed by a system including a plurality of amplifier circuits (27,29,35,39,43) and LED light source (19) for directing light into the zone in which an object may be present, and a pair of phototransistor sensors (21,23) disposed a selected distance from each other and receiving light reflected from the object when present. The geometrical arrangement defines a detection range R as shown in Figure 1. The source 19 is pulsed by generator 27. The combined detector signal is amplified at 35. Feedback loop including amplifier 41 is to cancel ambient light fluctuation effects. The signal at 45 is evaluated to provide an output from 37 if the object is within the range R. <IMAGE>
GB7907591A 1978-03-08 1979-03-05 Photodetector system Withdrawn GB2016141A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US88459178A 1978-03-08 1978-03-08

Publications (1)

Publication Number Publication Date
GB2016141A true GB2016141A (en) 1979-09-19

Family

ID=25384953

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7907591A Withdrawn GB2016141A (en) 1978-03-08 1979-03-05 Photodetector system

Country Status (3)

Country Link
JP (1) JPS54125052A (en)
DE (1) DE2906609A1 (en)
GB (1) GB2016141A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2483087A1 (en) * 1980-05-20 1981-11-27 Matsushita Electric Works Ltd MOTION OBJECT DETECTION APPARATUS
US4440022A (en) * 1981-10-14 1984-04-03 Smiths Industries Public Limited Company Liquid-level detection
GB2195763A (en) * 1986-09-13 1988-04-13 Theodoros Mastichiadis Water tap
WO1996036019A2 (en) * 1995-05-12 1996-11-14 WHD elektronische Prüftechnik GmbH Test device for use in processing machines
GB2355329A (en) * 1999-09-27 2001-04-18 Ian Sanderson Automatic doorbell device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57189907A (en) * 1981-05-18 1982-11-22 Daifuku Co Ltd Stop position learning method for delivering and storehousing crane
DE3603520C1 (en) * 1986-02-05 1997-05-22 Daimler Benz Aerospace Ag Passive optical sensor for weapon system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2483087A1 (en) * 1980-05-20 1981-11-27 Matsushita Electric Works Ltd MOTION OBJECT DETECTION APPARATUS
US4440022A (en) * 1981-10-14 1984-04-03 Smiths Industries Public Limited Company Liquid-level detection
GB2195763A (en) * 1986-09-13 1988-04-13 Theodoros Mastichiadis Water tap
GB2195763B (en) * 1986-09-13 1991-01-09 Theodoros Mastichiadis Water tap
WO1996036019A2 (en) * 1995-05-12 1996-11-14 WHD elektronische Prüftechnik GmbH Test device for use in processing machines
WO1996036019A3 (en) * 1995-05-12 1996-12-12 Whd Elektron Prueftech Gmbh Test device for use in processing machines
US5911298A (en) * 1995-05-12 1999-06-15 Whd Elektronische Prueftechnik Gmbh. Multi-compact-sensor adapted for mounting at an ascending angle
GB2355329A (en) * 1999-09-27 2001-04-18 Ian Sanderson Automatic doorbell device
GB2355329B (en) * 1999-09-27 2004-04-07 Ian Sanderson Automatic doorbell device

Also Published As

Publication number Publication date
JPS54125052A (en) 1979-09-28
DE2906609A1 (en) 1979-09-27

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)