Accession Number : AD0913419

Title :   Sensitivity Enhancement.

Descriptive Note : Final technical rept. 1 Nov 71-1 Jan 73,

Corporate Author : C AND C RESEARCH INC DANVERS MASS

Personal Author(s) : Cole,M. R. ; Bloom,Charles M.

Report Date : JUL 1973

Pagination or Media Count : 43

Abstract : This effort has demonstrated the feasibility of a technique (Concurrent Photon Amplification) to increase the rated speed of commercially available black and white film. The technique uses a supplemental non-imaging low light exposure concurrently with the image forming exposure. The technique has been installed in a Nikon F and Hasselblad 500 EL cameras. Tests with Kodak 2475, Tri-X, Pan, Panatomic-X and High Speed Infrared films have shown an increase in speed in every case, with the results being average speed increase of 2 to 4 times the rated film speed. In addition to the speed gain, there was an increase in the dynamic range and no loss in image quality of the film. A technique for use with processed films that provide a speed increase by physical development was also investigated. The technique was tested with the type films listed above and provided a speed increase of approximately 1/2 the rated film speed. (Author)

Descriptors :   (*PHOTOGRAPHIC FILM, PHOTOSENSITIVITY), (*PHOTOCHEMICAL REACTIONS, PHOTOGRAPHIC EMULSIONS), (*PHOTOGRAPHIC PROCESSING EQUIPMENT, LIGHT PULSES), LOW LIGHT LEVELS, COLOR FILM, INFRARED FILM, INTENSITY, PHOTOGRAPHIC CONTRAST, OPTIMIZATION, PHOTOGRAPHIC GRAIN, RESPONSE, EXPOSURE(PHYSIOLOGY), PHOTONS, SILVER COMPOUNDS, HALIDES, COLLOIDS, DEPOSITION, SURFACE PROPERTIES, SODIUM COMPOUNDS, SULFATES, IONS, OXYGEN, DEGRADATION

Subject Categories : Radiation and Nuclear Chemistry
      Photography

Distribution Statement : APPROVED FOR PUBLIC RELEASE