HUMIDITY SENSOR
First Claim
1. A humidity sensor responsive to changes in atmospheric water content by changes in electrical resistancE which comprises an electrically insulating substrate, a pair of spaced apart interdigitated electrodes positioned on one surface of the substrate, an electrical lead in contact with each of the electrodes, and a thin film of chloromethylated quaternized polystyrene containing from 3.3 to 8.6 percent chlorine adhering to the electrode surface of the sensor.
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Abstract
A humidity sensor which responds to changes in atmosphere water content by changes in electrical resistance, has an electrically insulating substrate, a pair of spaced apart interdigitated electrodes positioned on one surface of the substrate, an electrical lead in contact with each of the electrodes, and a thin film of chloromethylated quaternized polystyrene containing from 3.3 to 8.6 percent chlorine adhering to the electrode surface of the sensor.
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Citations
8 Claims
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1. A humidity sensor responsive to changes in atmospheric water content by changes in electrical resistancE which comprises an electrically insulating substrate, a pair of spaced apart interdigitated electrodes positioned on one surface of the substrate, an electrical lead in contact with each of the electrodes, and a thin film of chloromethylated quaternized polystyrene containing from 3.3 to 8.6 percent chlorine adhering to the electrode surface of the sensor.
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2. A humidity sensor as in claim 1, in which the chlorine range is 5.5 to 7.0 percent chlorine.
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3. A humidity sensor as in claim 1, in which the substrate is a glass-epoxy material.
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4. A humidity sensor as in claim 1, in which the electrodes are copper and are plated with gold.
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5. A humidity sensor as in claim 1, in which the electrodes are copper and are plated with silver.
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6. A humidity sensor as in claim 1, in which the electrodes are spaced apart 0.004 inch.
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7. A humidity sensor as in claim 1, in which the electrodes are spaced apart 0.008 inch.
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8. A humidity sensor as in claim 1, in which the electrodes are spaced apart 0.015 inch.
Specification
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- Resources
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Current AssigneeKenneth W. Browall, Leonard V. Interrante
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Original AssigneeKenneth W. Browall, Leonard V. Interrante
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InventorsInterrante, Leonard V., Browall, Kenneth W.
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Primary Examiner(s)Albritton, C. L.
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Application NumberUS05/201,279Time in Patent Office364 DaysField of Search338/35 73/73,335,336.5,338 200/61.06 340/235US Class Current338/35CPC Class CodesG01N 27/121 for determining moisture co...
