An Improved Apparatus for Measuring the Local Sweat Rate.

A new apparatus for measuring the sweat rate, utilizing a capsule with two hygrosensors of electrostatic capacity type, was designed and constructed. In this apparatus, the net value of sweat rate was estimated from the difference between the indicates of the two hygrosensors equipped at the upstream and downstream sides for the sweat collection window of the capsule. The apparatus is able to detect a small amount of perspiration accurately, and sufficient to follow the rapid change of the sweating activity.