Method for the electronic production of thermal image reproducti

Details Method for the electronic production of thermal image reproducti Method for the electronic production of thermal image reproducti

1987-02-19

1989-09-12

LaRoche, Eugene R.

Radiant energy

Infrared-to-visible imaging

250351, G02F 101

Patent

active

048662755

ABSTRACT:
A method and system for producing a temperature image of an object by the use of a television camera head responsive to temporal changes in infrared energy and operating in accordance with the pyroelectric effect. A chopper modulator alternately inhibits and facilitates transmission of thermal energy from a subject to the television camera head viewing the subject. Video information produced during separate first and second time intervals is separately stored. Video information produced during a third time interval between the first and second time intervals is not used. Video information produced during a fourth time interval subsequent to the second time interval is also not used. A signal is produced which is a function of the difference between the stored video information corresponding to the first and second time intervals. This difference signal is employed, in combination with appropriate synchronization signals, to drive a television monitor to produce a thermal image of the viewed subject.

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patent: 3628018 (1971-12-01), Desvignes
patent: 4063093 (1977-12-01), Asthermer et al.
patent: 4072863 (1978-02-01), Roundy
patent: 4402009 (1983-08-01), Rathjens et al.
patent: 4466748 (1984-08-01), Needham
patent: 4481535 (1984-11-01), Hodd et al.
patent: 4608599 (1986-08-01), Kaneko et al.
patent: 4634870 (1987-01-01), Metcalf

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