Abstract

The utilization of zinc cadmium sulfide phosphor plates to depict objects with infrared radiation is described. Radiation in the near and middle infrared, between 0.7 to 2.5 microns produces latent images on phosphors for subsequent visual observation or permanent photographic record. The sensitization consists of uniformly populating traps by excitation of the entire phosphor plate. The infrared radiation to be depicted, decreases the trap population of the phosphor corresponding to the intensity distribution of the incident beam. This results in a latent image. The latter is then developed (made visible) by exciting the entire phosphor plate which results in a visible, transient, negative fluorescence image. With phosphors which exhibit any degree of visible stimulated luminescence, irradiation with short-wave (≅0.7 μ) infrared can also develop the latent image. Sensitization, exposure, and development can be effected in rapid succession or after large time intervals (weeks) between steps.

© 1958 Optical Society of America

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