Head-mounted device, heat stroke prevention system and hydration warning system

摘要

The head mounting device includes a first flow path which is a gap between the outer shell and the wearer's head and the outer shell, a second flow path provided in the outer shell and connected to the first flow path, and a first flow path. A fan that blows air from one of the first and second channels to the other, a first humidity sensor for measuring the absolute humidity of the intake air that enters one of the first and second channels, and a first stream. It is provided with a second humidity sensor for measuring the absolute humidity of the exhaust air emitted from the other of the path and the second flow path.