A Device for Thermal Clearance of the Skin
Thermal conductivity measurements can be made on the skin by a variety of probe designs. The basic essentials are to provide a heated surface and a thermocouple system to monitor skin temperature changes created by the heater. In certain situations the temperature gradient around the probe is found to be related to superficial blood flow. The presence of larger blood vessels and direction of blood flow can be significant factors in thermal conductivity measurements of tissue by this technique.1 Nevertheless, useful values for ‘thermal clearance’ of skin can be made, particularly when serial measurements are made from the same area.2 A special probe has been developed for this procedure which proves to give stable results. It is inexpensive and is constructed from the ceramic base of a potentiometer. The geometric structure of the probe is different from that of other workers.3,4 The heater is a 270o metal film track, and the thermocouples are placed in the center of the probe (Fig 1). Matched pairs of thermojunctions ranged around the periphery of the heater serve to monitor temperature difference between the area under the probe, and the area 2 cm beyond its circumference.
KeywordsNicotinic Acid Infrared Thermography Thermal Conductivity Measurement Ultra Violet Radiation Skin Erythema
Unable to display preview. Download preview PDF.
- 2.N. Britton, J. R. Barker, E. F. J. Ring, An assessment of the thermal clearance method for measuring perfusion, in: “Recent Advances in Medical Thermology,” Plenum, New York (1983).Google Scholar
- 4.W. J. B. M. Van de Staak, A. J. M. Brakkec, H. E. De RiijkeHerweijer, J. Invest. Dermatol. 51: 149–154 (1968).Google Scholar