Simultaneous video and thermal imaging of cryogen spray cooling

摘要

Abstract: In order to understand better the dynamic interaction of cryogen spray cooling of skin, video and thermal images were obtained simultaneously. The cryogen spurt was applied either to skin phantoms (gelatin, 70% water by mass) or in vivo human skin; imaging was performed with a CCD camera (30 frames per second) and a high-speed infrared camera (100 - 850 frames per second). Acquired thermal images were compared to visible images, and a time sequence of different events (ice formation, ice temperature changes, etc.) was developed and used as an input into computer models to provide a more realistic estimation of cryogen spray cooling dynamics. Ice formation, which was present for durations on the order of seconds, had the greatest effect on the theoretical temperature distribution. !9