Humidity sensing and measurement employing halogenated organic polymer membranes
First Claim
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1. Humidity sensitive apparatus comprising a thin film of hygroscopic, halogenated organic polymer having pendant groups of a relatively strong acidic type and pendant groups of a relatively weak acidic type, and means attached to said polymer film for applying to the same a signal of a type having a parameter which will be affected by said polymer film in varying degree as a function of the water content of said polymer film.
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Abstract
Thin films of hygroscopic, halogenated organic polymer having pendant groups of a relatively strong acidic type (e.g., sulfonic groups) and pendant groups of a relatively weak acidic type (e.g., carboxylic groups) are employed for humidity sensing by electronic, acoustic, and optical techniques.
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30 Claims
- 1. Humidity sensitive apparatus comprising a thin film of hygroscopic, halogenated organic polymer having pendant groups of a relatively strong acidic type and pendant groups of a relatively weak acidic type, and means attached to said polymer film for applying to the same a signal of a type having a parameter which will be affected by said polymer film in varying degree as a function of the water content of said polymer film.
- 16. A method of constructing humidity sensitive apparatus, comprising providing a thin film of hygroscopic, halogenated organic polymer having pendant groups of a relatively strong acidic type and pendant groups of a relatively weak acidic type and attaching to said polymer film means for applying to the same a signal of a type having a parameter which will be affected by said polymer film in varying degree as a function of the water content of said polymer film.
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