Abstract
A new principle of a sensor for monitoring of moisture in porous materials is presented. The sensor utilizes changes of the thermal conductivity of a porous structure when pores are filled with the air/vapor, water, or ice depending on thermodynamic conditions. A hot-ball method is used for measuring the thermal conductivity. The moisture sensor is made of the cylindrical core drilled from the parent material. The signal of the sensor is not sensitive to ionic radicals of the pore medium. The method of sensor calibration is presented, as well. Then the moisture sensor (hot ball) is inserted back into the drilled hole of the material to ensure that the porous structure of both the sensor and the investigated material are identical. Sensors can be made of porous materials in the range of porosities from 0.3 % up to 70 %. A simple device is constructed that allows monitoring of moisture in real conditions.
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