Abstract
The near-infrared absorption type apparatus which measures continuously the rate of perspiration or the amount of sweating in certain period on the body surface is described.
Dry air is passed at a measured rate through the measuring cell adhered to the skin surface tightly, then into the near-infrared hygrometer. In this process, dry air contains moisture given off from the skin surface. The out-put of this hygrometer is recorded and the rate of perspiration is calculated.
This apparatus is fast enough to detect perspiration changes without appreciable lag, and sensitive to perspiration levels as low as 0.01mg/10cm2·min. The accuracy of the apparatus better than 3% is obtained.
