FARING EQUIPMENT WITHOUT ELECTRICAL EQUIPMENT HOS EN ELECTRICAL FUNCTIONAL EQUIPMENT

摘要

The operation of an electrical humidity sensor 10 is based on the capacitance change of an organic polymer film (13). The film is heated to a temperature above the ambient temperature. Heating is achieved either by the passage of measuring current through the polymer film, or by a separate resistance plated onto the sensor substrate 11, or by an external radiation source. Ambient temperature and sensor temperature are measured by temperature sensors 17, 15 and signalled to a circuit 20 which controls input voltage U to the sensor IMAGE