Abstract: A pressure sensor element includes a polymer optical conductor which includes a substrate, a first organic polymer film formed on the substrate, a second organic polymer film superposed on the first organic polymer film, and an optical reflecting film provided on a patterned end face of the first organic polymer film. The first organic polymer film portion within the pattern has a refractive index different from that of the substrate. The first organic polymer film portion outside the pattern has substantially the same refractive index as the substrate. The refractive index of the second organic polymer film is substantially the same as that of the first organic polymer film portion outside the pattern. At least either one of the refractive indexes of the first and second organic polymer films changes with pressure fluctuation.

Abstract: A moisture sensitive resistive element includes a substrate made of an electrically non-conductive material, first and second electrodes deposited on the substrate in a spaced relation to each other, and a moisture sensitive film deposited on the substrate covering both the first and second electrodes. The moisture sensitive film is formed by a material given by a formula: [--CH(C.sub.6 H.sub.4 SO.sub.3 X)--CH.sub.2 --].sub.n wherein X is any one of a hydrogen atom, metal atom, ammonium, urea, triethylenediamine, tetramethyleneguanidine and hexamethylenediamine, or formed by a mixture of the above material with a hydrophilic polymer which is any one selected from a group consisting of polyvinyl alcohol, methyl cellulose and polyamide resin.

Abstract: A moisture sensitive resistive element includes a substrate made of an electrically non-conductive material, first and second electrodes deposited on the substrate in a spaced relation to each other, and a moisture sensitive film deposited on the substrate covering both the first and second electrodes. The moisture sensitive film is formed by a material given by a formula: [--CH(C.sub.6 H.sub.4 SO.sub.3 X)--CH.sub.2 --].sub.n wherein X is any one of a hydrogen atom, metal atom, ammonium, urea, triethylenediamine, tetramethyleneguanidine and hexamethylenediamine, or formed by a mixture of the above material with a hydrophilic polymer which is any one selected from a group consisting of polyvinyl alcohol, methyl cellulose and polyamide resin.

Abstract: A moisture responsive element comprises a moisture responsive organic membrane in contact with electrically conductive members, in which the organic membrane consists essentially of a crosslinked organic polymer having a hydrophilic group. The element has excellent water and moisture resistance, long-term stability and excellent humidity response over a range of humidity from 0 to 100 percent. The moisture responsive element includes a protective layer of cellulose acetate and/or polyvinyl acetate.