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 lightingInfo
- 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
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.
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)
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 |
-
1973
- 1973-04-04 FR FR7312743A patent/FR2225064A5/en not_active Expired
Cited By (6)
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 |