TEMPERATURE VARIATION AND SENSITIVITY IN TWO-PHASE THERMAL IMAGE DETECTORS
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1959
- Accession Number
- AD0287746
Entities
People
- Conrad Schadt
Organizations
- SRI International