GB1478761A - Thermal imaging system with redundant object space scanning - Google Patents

Thermal imaging system with redundant object space scanning

Info

Publication number
GB1478761A
GB1478761A GB1542975A GB1542975A GB1478761A GB 1478761 A GB1478761 A GB 1478761A GB 1542975 A GB1542975 A GB 1542975A GB 1542975 A GB1542975 A GB 1542975A GB 1478761 A GB1478761 A GB 1478761A
Authority
GB
United Kingdom
Prior art keywords
scan
field
elevation
array
mirror
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
GB1542975A
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 GB1542975A priority Critical patent/GB1478761A/en
Priority to NL7504675A priority patent/NL170079C/en
Priority to DE19752517406 priority patent/DE2517406C2/en
Priority to FR7512827A priority patent/FR2309092A1/en
Publication of GB1478761A publication Critical patent/GB1478761A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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

Abstract

1478761 Infra-red imaging system HUGHES AIRCRAFT CO 15 April 1975 15429/75 Heading H4F Thermal imaging system comprises optics 30-38 directing an infra-red scene image on to an azimuth-scan rotating mirror drum 40 and then via an elevation oscillating mirror 44 to an array of detector elements 48, the electrical outputs of which are connected via individual channels to an identical array of light emitting elements 60 whose light outputs are directed via an elevation oscillatory mirror 64 (mounted on the other end of the pivotally yoke 43 on which mirror 44 is mounted), azimuth-scan mirror drum 40 and optics 66-68 to a viewer or vidicon camera. With this arrangement each detector element views every point in the field of view during each scanning frame period. The detector array 48, Fig. 3, (which is identical to the LED array 60) specifically comprises 18 detectors arranged in six groups each of three detectors aligned in the azimuthal scan direction so that a complete field scan is effected as shown in Fig. 4. At the end of each field scan the elevation scan structure is indexed by 1¢ effective scan lines (fractional relationship between azimuth and elevation cycles) so that the scan lines of the fields are interlaced, and as shown in Fig. 4 four field scans comprise a complete frame scan. Thus during one frame period a number (i.e. 18) of registered pictures each of which is indicative of the thermal energy distribution within the field of view is produced, this number corresponding to the number of detector element and LED pairs. The detector array has a 50% "over scan" since the lower one-third portion of the three detectors of each group is scanned by the same segment of the field of view as the upper onethird portion of the three detectors of the adjacent group (this overlap is not indicated in Fig. 4). The input optics include an objective 30, a focusing lens 32, a boresight prism 34, a field switch lens 36 and a relay lens 38. The output optics comprise lenses 66 and 68, and a reticle pattern 67. The system is such that channel to channel non-uniformity does not cause line to line or region to region non-uniformity, and in addition the resulting image is insensitive to the presence of dead channels. The system is suitable for use with an afocal magnifying system.
GB1542975A 1975-04-15 1975-04-15 Thermal imaging system with redundant object space scanning Expired GB1478761A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB1542975A GB1478761A (en) 1975-04-15 1975-04-15 Thermal imaging system with redundant object space scanning
NL7504675A NL170079C (en) 1975-04-15 1975-04-18 INFRARED IMAGE CONVERTER EQUIPPED WITH A SCAN.
DE19752517406 DE2517406C2 (en) 1975-04-19 Apparatus for generating images with a detector arrangement
FR7512827A FR2309092A1 (en) 1975-04-15 1975-04-24 INFRARED IMAGE FORMING DEVICE WITH REDUNDANT OBJECT SPACE SCAN

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1542975A GB1478761A (en) 1975-04-15 1975-04-15 Thermal imaging system with redundant object space scanning

Publications (1)

Publication Number Publication Date
GB1478761A true GB1478761A (en) 1977-07-06

Family

ID=10058976

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1542975A Expired GB1478761A (en) 1975-04-15 1975-04-15 Thermal imaging system with redundant object space scanning

Country Status (3)

Country Link
FR (1) FR2309092A1 (en)
GB (1) GB1478761A (en)
NL (1) NL170079C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140649A (en) * 1983-04-08 1984-11-28 Citizen Watch Co Ltd Correcting for faulty photodetectors in an image pickup system

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2585911B2 (en) * 1976-12-14 1988-05-13 Trt Telecom Radio Electr OPTICO-MECHANICAL SCANNING DEVICE
FR2593657B2 (en) * 1977-01-26 1988-05-13 Trt Telecom Radio Electr OPTICO-MECHANICAL SCANNING DEVICE.
GB1587098A (en) * 1978-05-25 1981-04-01 Emi Ltd Image forming apparatus
NL7806503A (en) * 1978-06-16 1979-12-18 Philips Nv DEVICE FOR TWO-DIMENSIONAL SCANNING.
FR2586520B2 (en) * 1978-11-06 1988-05-13 Trt Telecom Radio Electr OPTICO-MECHANICAL SCANNING DEVICE

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829192A (en) * 1971-05-28 1974-08-13 Hughes Aircraft Co Receive and display optical raster scan generator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140649A (en) * 1983-04-08 1984-11-28 Citizen Watch Co Ltd Correcting for faulty photodetectors in an image pickup system

Also Published As

Publication number Publication date
NL7504675A (en) 1976-10-20
FR2309092B1 (en) 1979-03-30
FR2309092A1 (en) 1976-11-19
NL170079B (en) 1982-04-16
NL170079C (en) 1982-09-16
DE2517406B1 (en) 1975-12-04

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19950414