초록 ▼

An electrical resistance type humidity sensor is herein disclosed which comprises a humidity sensor in which electrodes are formed on a woodceramics substrate having linear characteristics with humidity, and a temperature sensor for temperature correction in which electrodes are formed on other wood

An electrical resistance type humidity sensor is herein disclosed which comprises a humidity sensor in which electrodes are formed on a woodceramics substrate having linear characteristics with humidity, and a temperature sensor for temperature correction in which electrodes are formed on other woodceramics substrate having the identical characteristics as in the woodceramics humidity sensor and a film coating of a nonhygroscopic material is formed on the surface of the substrate. Thus, a resistance value measured by the woodceramics humidity sensor is corrected on the basis of a resistance value measured by the woodceramics temperature sensor to obtain an output voltage in proportion to a relative humidity. A structure insensitive to a humidity formed from all the same material i.e. woodceramics as in the humidity sensor is utilized as the temperature sensor for the temperature correction to carry out the temperature correction by the temperature sensor, whereby the humidity sensor having the linear characteristics can be obtained.

대표청구항 ▼

[ What is claimed is:] [1.]1. An electrical resistance type humidity sensor which comprises a humidity sensor in which electrodes are formed on a first woodceramics substrate, and a temperature sensor for temperature correction in which electrodes are formed on a second woodceramics substrate having

[ What is claimed is:] [1.]1. An electrical resistance type humidity sensor which comprises a humidity sensor in which electrodes are formed on a first woodceramics substrate, and a temperature sensor for temperature correction in which electrodes are formed on a second woodceramics substrate having the same temperature coefficient as the first woodceramics substrate and a film coating of a nonhygroscopic material is formed on the surface of the second substrate, wherein woodceramics are porous carbon material produced by sintering and carbonizing a composite material of woody material, wherein the woody material is selected from the group consisting of lumber, wood, board, paper, bamboo, wood wastes and waste papers, and a thermosetting resin at a high temperature; a resistance value measured by the humidity sensor being corrected on the basis of a resistance value measured by the temperature sensor having the identical temperature coefficient as in the woodceramics humidity sensor to obtain an output voltage in proportion to a relative humidity.