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GB2319141A - Thermal imaging system - Google Patents

Thermal imaging system

Info

Publication number
GB2319141A
GB2319141A GB9803657A GB9803657A GB2319141A GB 2319141 A GB2319141 A GB 2319141A GB 9803657 A GB9803657 A GB 9803657A GB 9803657 A GB9803657 A GB 9803657A GB 2319141 A GB2319141 A GB 2319141A
Authority
GB
United Kingdom
Prior art keywords
temperature
diode
scene
imaging system
difference
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.)
Granted
Application number
GB9803657A
Other versions
GB2319141B (en
GB9803657D0 (en
Inventor
Timothy Ashley
Charles Thomas Elliott
Neil Thomson Gordon
Ralph Stephen Hall
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 GB9520060A external-priority patent/GB2305799A/en
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB9803657A priority Critical patent/GB2319141B/en
Publication of GB9803657D0 publication Critical patent/GB9803657D0/en
Publication of GB2319141A publication Critical patent/GB2319141A/en
Application granted granted Critical
Publication of GB2319141B publication Critical patent/GB2319141B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/52—Radiation pyrometry, e.g. infrared or optical thermometry using comparison with reference sources, e.g. disappearing-filament pyrometer
    • G01J5/53—Reference sources, e.g. standard lamps; Black bodies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/20—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from infrared radiation only
    • H04N23/21—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from infrared radiation only from near infrared [NIR] radiation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise
    • H04N25/67—Noise processing, e.g. detecting, correcting, reducing or removing noise applied to fixed-pattern noise, e.g. non-uniformity of response
    • H04N25/671—Noise processing, e.g. detecting, correcting, reducing or removing noise applied to fixed-pattern noise, e.g. non-uniformity of response for non-uniformity detection or correction
    • H04N25/673—Noise processing, e.g. detecting, correcting, reducing or removing noise applied to fixed-pattern noise, e.g. non-uniformity of response for non-uniformity detection or correction by using reference sources

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Radiation Pyrometers (AREA)

Abstract

A thermal imaging system (10) which is accoupled and operates by scanning recreates a thermal image by superimposing measured variations in infrared emission from a scene (22) onto a reference level supplied by a light emitting diode (28). The diode (28) is both a positive and negative luminescent emitter; emitted flux is current controlled to be equivalent to black body radiation at a range of temperatures which may be colder or hotter than ambient. A signal generated when the system (10) switches between scene and diode observation is a measure of the difference between the mean scene temperature and the diode effective temperature. In response to this digital, control means adjust the bias current through the diode (28) in order to reduce the temperature difference. The reference temperature converges towards the mean scene temperature as this process is repeated. Absolute temperature is thus restored and some image defects removed.
GB9803657A 1995-10-02 1996-09-24 Thermal imaging system Expired - Fee Related GB2319141B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9803657A GB2319141B (en) 1995-10-02 1996-09-24 Thermal imaging system

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9520060A GB2305799A (en) 1995-10-02 1995-10-02 Thermal imaging system with controlled mean scene reference temperature source
PCT/GB1996/002347 WO1997013358A1 (en) 1995-10-02 1996-09-24 Thermal imaging system
GB9803657A GB2319141B (en) 1995-10-02 1996-09-24 Thermal imaging system

Publications (3)

Publication Number Publication Date
GB9803657D0 GB9803657D0 (en) 1998-04-15
GB2319141A true GB2319141A (en) 1998-05-13
GB2319141B GB2319141B (en) 2000-03-08

Family

ID=26307852

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9803657A Expired - Fee Related GB2319141B (en) 1995-10-02 1996-09-24 Thermal imaging system

Country Status (1)

Country Link
GB (1) GB2319141B (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935382A (en) * 1974-03-04 1976-01-27 Spectrotherm Corporation Thermograph absolute temperature referencing technique
US4419692A (en) * 1981-12-31 1983-12-06 Texas Medical Instruments, Inc. High speed infrared imaging system
US4561786A (en) * 1984-03-15 1985-12-31 Williamson Corporation Temperature measuring apparatus
EP0365948A1 (en) * 1988-10-25 1990-05-02 ELTRO GmbH Gesellschaft für Strahlungstechnik Thermal imager with detector alignment
US4948964A (en) * 1988-01-14 1990-08-14 Texas Instruments Incorporated Artificial target for automatic gain normalization
GB2242741A (en) * 1990-04-04 1991-10-09 Eev Ltd Thermal imaging apparatus
EP0550824A1 (en) * 1992-01-10 1993-07-14 Siemens Schweiz AG Procedure and circuit for avoiding imaging errors in thermal imagers
WO1993024815A1 (en) * 1992-05-26 1993-12-09 Agema Infrared Systems Ab Detector calibration
US5354987A (en) * 1992-12-07 1994-10-11 Texas Instruments Incorporated Calibrating focal plane arrays using multiple variable radiometric sources

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2303988A (en) * 1995-07-31 1997-03-05 Secr Defence Thermal imaging system with detector array calibration mode

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935382A (en) * 1974-03-04 1976-01-27 Spectrotherm Corporation Thermograph absolute temperature referencing technique
US4419692A (en) * 1981-12-31 1983-12-06 Texas Medical Instruments, Inc. High speed infrared imaging system
US4561786A (en) * 1984-03-15 1985-12-31 Williamson Corporation Temperature measuring apparatus
US4948964A (en) * 1988-01-14 1990-08-14 Texas Instruments Incorporated Artificial target for automatic gain normalization
EP0365948A1 (en) * 1988-10-25 1990-05-02 ELTRO GmbH Gesellschaft für Strahlungstechnik Thermal imager with detector alignment
GB2242741A (en) * 1990-04-04 1991-10-09 Eev Ltd Thermal imaging apparatus
EP0550824A1 (en) * 1992-01-10 1993-07-14 Siemens Schweiz AG Procedure and circuit for avoiding imaging errors in thermal imagers
WO1993024815A1 (en) * 1992-05-26 1993-12-09 Agema Infrared Systems Ab Detector calibration
US5354987A (en) * 1992-12-07 1994-10-11 Texas Instruments Incorporated Calibrating focal plane arrays using multiple variable radiometric sources

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Infrared Physics, 29(2-4) 667 (1989), 'Negative luminescenceof semiconductors' *
Optoelectronics, instrumentation and data processing, no 4, 1989, pp 92 - 95, S.S.Bolgov et al *

Also Published As

Publication number Publication date
GB2319141B (en) 2000-03-08
GB9803657D0 (en) 1998-04-15

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20040924