Radiant energy – With infrared or thermal pattern recording
Patent
1984-08-22
1986-03-18
Anderson, Bruce C.
Radiant energy
With infrared or thermal pattern recording
250330, G03B 4200, G03C 516
Patent
active
045771030
ABSTRACT:
A method of photographically recording at high speed the far field pattern of a high energy infrared laser beam over a selected period of time for providing rapid repetitive samples of information on beam parameters such as far field beam intensity, jitter, and absolute beam size and power. A sample from a high energy infrared laser beam is directed into an enclosure that is light tight to visible radiation and contains an operating lensless movie camera loaded with suitable movie film. The infrared beam is focused on the film plane of the camera so that consecutive frames of the film are irradiated by the infrared beam each time the camera shutter is open. The period of irradiation is of sufficient duration to sensitize the film to visible radiation in the areas where the infrared radiation impinges on the film. The position of the camera shutter is detected and an electrical trigger signal generated just before the shutter is closed for each frame. The trigger signal is applied to appropriate circuitry which actuates a light source to generate a pulse of visible light that irradiates the film plane of the camera near the end of each shutter movement to expose each frame of the film. The exposed film strip is developed to provide a continuous record of the infrared laser beam characteristics over the selected period of time.
REFERENCES:
patent: 4018608 (1977-04-01), Frazier
Gene F. Frazier et al., Infrared Photography, Applied Optics/vol. 15, No. 6/Jun. 1976, pp. 1350-1352.
David Naor et al., IR Laser Photograph with Silver Halide Emulsion, Applied Optics/vol. 20, No. 14/15 Jul. 1981, pp. 2574-2584.
G. R. Mitchell et al., Nanosecond Photography at 10.6 .mu.m Using Silver Halide Film, Applied Optics/vol. 18, No. 14/15 Jul. 1979.
Duneman Dennis C.
Geary Joseph M.
Moeller Charles E.
Sessions Ronald L.
Vunck Darius S.
Anderson Bruce C.
Flanagan John R.
Guss Paul A.
Scearce Bobby D.
Singer Donald J.
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