FR2225064A5 - Reflection type photo-sensitive transistors head - sensitivity maintained constant for variable values of ambient lighting - Google Patents

Reflection type photo-sensitive transistors head - sensitivity maintained constant for variable values of ambient lighting

Info

Publication number
FR2225064A5
FR2225064A5 FR7312743A FR7312743A FR2225064A5 FR 2225064 A5 FR2225064 A5 FR 2225064A5 FR 7312743 A FR7312743 A FR 7312743A FR 7312743 A FR7312743 A FR 7312743A FR 2225064 A5 FR2225064 A5 FR 2225064A5
Authority
FR
France
Prior art keywords
photo
sensitivity
transistor
ambient lighting
head
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
FR7312743A
Other languages
French (fr)
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.)
COMETA SA
Original Assignee
COMETA SA
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 COMETA SA filed Critical COMETA SA
Priority to FR7312743A priority Critical patent/FR2225064A5/en
Application granted granted Critical
Publication of FR2225064A5 publication Critical patent/FR2225064A5/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres
    • 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)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Health & Medical Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

A light source and a receiver with a photo-transistor of other photo-element, are used with an optical system which directs the emitted light onto an exterior reflector, so that it is directed back to the receiver. An auxiliary luminous source is added which permanently illuminates the photo-transistor which constitutes the photo-electric receiver. This auxiliary lighting source maintains sensibly constant the sensitivity of the photo-transistor for wide variations of ambient lighting. The sensitivity of the photo-transistor increases rapidly when the ambient lighting passes from 0 to a 1000 lux. With the addition of auxiliary lighting, the sensitivity of the photo-transistor is maintained sensibly constant from 0 to a 1000 lux.
FR7312743A 1973-04-04 1973-04-04 Reflection type photo-sensitive transistors head - sensitivity maintained constant for variable values of ambient lighting Expired FR2225064A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7312743A FR2225064A5 (en) 1973-04-04 1973-04-04 Reflection type photo-sensitive transistors head - sensitivity maintained constant for variable values of ambient lighting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7312743A FR2225064A5 (en) 1973-04-04 1973-04-04 Reflection type photo-sensitive transistors head - sensitivity maintained constant for variable values of ambient lighting

Publications (1)

Publication Number Publication Date
FR2225064A5 true FR2225064A5 (en) 1974-10-31

Family

ID=9117656

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7312743A Expired FR2225064A5 (en) 1973-04-04 1973-04-04 Reflection type photo-sensitive transistors head - sensitivity maintained constant for variable values of ambient lighting

Country Status (1)

Country Link
FR (1) FR2225064A5 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2494912A1 (en) * 1980-11-21 1982-05-28 Radiotechnique Compelec Optical coupling detector for switching tape motor - has LED and phototransistor in parallel with partial flux link in moulded plastics lens envelope for temp. stable
EP0569686A1 (en) * 1992-05-09 1993-11-18 Leuze electronic GmbH + Co. Surveillance apparatus comprising transmitter, receiver and signal processing circuit
WO1999050172A1 (en) * 1998-04-01 1999-10-07 Electro-Pro, Inc. Device and method for dectecting presence and size of a container, for monitoring liquid level inside said container and for compensating for ambient light
US6394153B2 (en) 1998-04-01 2002-05-28 Electro-Pro, Inc. Control method and apparatus to detect the presence of a first object and monitor a relative position of the first or subsequent objects such as container identification and product fill control

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2494912A1 (en) * 1980-11-21 1982-05-28 Radiotechnique Compelec Optical coupling detector for switching tape motor - has LED and phototransistor in parallel with partial flux link in moulded plastics lens envelope for temp. stable
EP0569686A1 (en) * 1992-05-09 1993-11-18 Leuze electronic GmbH + Co. Surveillance apparatus comprising transmitter, receiver and signal processing circuit
WO1999050172A1 (en) * 1998-04-01 1999-10-07 Electro-Pro, Inc. Device and method for dectecting presence and size of a container, for monitoring liquid level inside said container and for compensating for ambient light
US6082419A (en) * 1998-04-01 2000-07-04 Electro-Pro, Inc. Control method and apparatus to detect the presence of a first object and monitor a relative position of the first or subsequent objects such as container identification and product fill control
US6227265B1 (en) 1998-04-01 2001-05-08 Electro-Pro, Inc. Control method and apparatus to detect the presence of a first object and monitor a relative position of the first or subsequent objects such as container identification and product fill control
US6394153B2 (en) 1998-04-01 2002-05-28 Electro-Pro, Inc. Control method and apparatus to detect the presence of a first object and monitor a relative position of the first or subsequent objects such as container identification and product fill control

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Legal Events

Date Code Title Description
ST Notification of lapse