Accession Number : AD0287746

Title :   TEMPERATURE VARIATION AND SENSITIVITY IN TWO-PHASE THERMAL IMAGE DETECTORS

Descriptive Note : Technical rept. 1 Sep-13 Mar 59,

Corporate Author : STANFORD RESEARCH INST MENLO PARK CALIF

Personal Author(s) : SCHADT,CONRAD

Report Date : 01 APR 1959

Pagination or Media Count : 14

Abstract : The feasibility of using an isothermal two-phase system for thermal imaging was examined. This supplement to the final report comprises a mathematical analysis of the operation of such a system, taking into account a temperature difference between the two phases. Through the analysis it is finally shown that the sensitivity and the temperature difference have opposite signs for all imaging films of practical thickness, where the temperature difference is defined as positive when the liquid state is warmer than the solid state; and the sensitivity is defined as positive when the ratio of liquid to solid increases when the received radiation increases. This means that there is no steady-state or stable configuration of the film, under the assumptions of one substance in two phases, subjected to the radiant fluxes assumed in this report, except for films so thick that heat conductance is negligible compared with radiative transfer. (Author)

Descriptors :   *DETECTORS, *INFRARED IMAGES, *INFRARED RADIATION, *OPTICAL EQUIPMENT, *THERMAL RADIATION, DETECTION, HEAT TRANSFER, MATHEMATICAL ANALYSIS, SURFACE TARGETS, TEMPERATURE, THIN FILMS (STORAGE DEVICES)

Distribution Statement : APPROVED FOR PUBLIC RELEASE