GB1444518A - Synchronous thermal imaging system - Google Patents

Synchronous thermal imaging system

Info

Publication number
GB1444518A
GB1444518A GB1360374A GB1360374A GB1444518A GB 1444518 A GB1444518 A GB 1444518A GB 1360374 A GB1360374 A GB 1360374A GB 1360374 A GB1360374 A GB 1360374A GB 1444518 A GB1444518 A GB 1444518A
Authority
GB
United Kingdom
Prior art keywords
vertical
detector
mirror
detectors
image
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
GB1360374A
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.)
Raytheon Co
Original Assignee
Hughes Aircraft Co
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 Hughes Aircraft Co filed Critical Hughes Aircraft Co
Priority to GB1360374A priority Critical patent/GB1444518A/en
Priority to FR7411212A priority patent/FR2266398B1/fr
Priority to DE19742416482 priority patent/DE2416482C3/en
Publication of GB1444518A publication Critical patent/GB1444518A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/30—Transforming light or analogous information into electric information
    • H04N5/33—Transforming infrared radiation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/02—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only
    • H04N3/08—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only having a moving reflector
    • H04N3/09—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only having a moving reflector for electromagnetic radiation in the invisible region, e.g. infrared

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Radiation Pyrometers (AREA)
  • Closed-Circuit Television Systems (AREA)

Abstract

1444518 Infra-red scanning system HUGHES AIRCRAFT CO 27 March 1974 13603/74 Heading H4F An infra-red scanning and display system for use in an aircraft such as a helicopter for obtaining a thermal image of the terrain comprises a vertical array of detectors across which an image of the terrain is swept (i.e. azimuthal scan) by a mirror, the resulting simultaneous video signals from the linear detector array being passed to a time division multiplexer type processing arrangement operable in real time to sample the video signals and to render the samples sequential so that they correspond to a vertical image line scan, and the resulting vertical raster scan video signal being displayed, e.g. on a CRT, under the control of synchronizing pulses generated in the processing arrangement. The time division multiplexing is effected in two stages, for example in the embodiment described an N detector linear array is divided into four groups each including every fourth detector, i.e. N/4 detectors, the sampled outputs from the detectors of each group being first rendered sequential and then appropriately time division multiplexed with each other. An interlace mirror is including in the optical scanning system so that successive field scans are interlaced, i.e. an interlaced display of vertical lines is produced. An AGC circuit is associated with each detector and is responsive to a modulated reference signal derived thereby in response to a modulated automatic responsivity control light source. Any effect of a cold narcissus image formed in response to the detector array (which is maintained at a low temperature) by reflection from optics in the system is cancelled by providing a hot infrared narcissus vertical-image line source, a proportion of the output of which is modulated (by a modulating slit and beam splitter arrangement) to comprise the AGC control source. Adjustably positioned horizontal and vertical sight-lines (boresights) may be added to the processed video signal and displayed, the optical imaging telescope-type system including an adjustable vertical boresight mirror and the horizontal boresight being generated electrically in response to the horizontal sync pulse. In addition the optical system includes adjustable optical elements for narrow and wide field of views, and an adjustable pointing mirror.
GB1360374A 1974-03-27 1974-03-27 Synchronous thermal imaging system Expired GB1444518A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1360374A GB1444518A (en) 1974-03-27 1974-03-27 Synchronous thermal imaging system
FR7411212A FR2266398B1 (en) 1974-03-27 1974-03-29
DE19742416482 DE2416482C3 (en) 1974-03-27 1974-04-04 Device for automatic control of the sensitivity of an infrared receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1360374A GB1444518A (en) 1974-03-27 1974-03-27 Synchronous thermal imaging system

Publications (1)

Publication Number Publication Date
GB1444518A true GB1444518A (en) 1976-08-04

Family

ID=10026046

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1360374A Expired GB1444518A (en) 1974-03-27 1974-03-27 Synchronous thermal imaging system

Country Status (3)

Country Link
DE (1) DE2416482C3 (en)
FR (1) FR2266398B1 (en)
GB (1) GB1444518A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4383271A (en) * 1980-05-22 1983-05-10 Barr & Stroud Limited Thermal imager
GB2189105A (en) * 1978-10-18 1987-10-14 Marconi Co Ltd Target detection systems
EP0459010A2 (en) * 1990-05-29 1991-12-04 Westinghouse Electric Corporation Integrated thermal imaging system
US5274235A (en) * 1990-05-29 1993-12-28 Kollmorgen Corp Integrated imaging system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2492616A1 (en) * 1980-10-17 1982-04-23 Thomson Csf OPTO-ELECTRONIC ROTATING SCANNING VIDEO-FREQUENCY IMAGE ANALYSIS DEVICE

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3353022A (en) * 1959-01-29 1967-11-14 Avion Electronics Inc Infrared search system comprising means for differentiating between target and background radiation
NL286190A (en) * 1961-12-01
US3631248A (en) * 1969-12-30 1971-12-28 Texas Instruments Inc Target-scanning camera comprising a constant temperature source for providing a calibration signal

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2189105A (en) * 1978-10-18 1987-10-14 Marconi Co Ltd Target detection systems
US4728795A (en) * 1978-10-18 1988-03-01 The Marconi Company Limited Optical target detection systems
US4383271A (en) * 1980-05-22 1983-05-10 Barr & Stroud Limited Thermal imager
EP0459010A2 (en) * 1990-05-29 1991-12-04 Westinghouse Electric Corporation Integrated thermal imaging system
EP0459010A3 (en) * 1990-05-29 1992-04-22 Kollmorgen Corp Integrated thermal imaging system
US5274235A (en) * 1990-05-29 1993-12-28 Kollmorgen Corp Integrated imaging system

Also Published As

Publication number Publication date
DE2416482B2 (en) 1976-03-18
DE2416482C3 (en) 1982-08-05
FR2266398A1 (en) 1975-10-24
FR2266398B1 (en) 1977-09-30
DE2416482A1 (en) 1975-10-16

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930327