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Thermal Radiography Utilizing Liquid Crystals

1971; Volume: 13; Issue: 2 Linguagem: Inglês

10.1080/15421407108084960

0026-8941

Reinhard D. Ennulat, James L. Fergason,

Infrared Target Detection Methodologies

Abstract A thermal imaging system using cholesteric liquid crystals has been designed and built which utilizes the extreme temperature sensitivity of cholesteryl oleyl carbonate. Theoretical considerations for the design and the operating conditions of the device are given. The experimental results indicate that the limitations on such a device are primarily due to the finite film thickness required for scattering by the cholesteric liquid (on the order of ten micrometers). This system was able to image 0.2°C with a limiting resolution of one line pair per millimeter. Improved lighting for direct viewing of the liquid crystal film should result in a sensitivity of about 0.02°C.