Real-time passive detection of humidity using vanillin
First Claim
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1. A method for passive colorimetric detection of humidity comprising the steps of:
- (a) providing a substrate coated with vanillin acidified with sulfuric acid in acetone; and
(b) exposing said substrate to a humid environment, said substrate changing from a first color to a second color as a function of the humidity to which said substrate has been exposed.
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Abstract
A method and device involving use of the reaction product of an aldehyde acidified with sulfuric acid in acetone for sensing moisture. The reaction product is used as a coating for colorimetric detection of humidity, the color of the coating changing as a function of the humidity level. The coating is applied to a thin layer chromatography plate which is received in a badge housing to provide a real-time colorimetric dosimeter for monitoring humidity and indicating its presence.
17 Citations
18 Claims
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1. A method for passive colorimetric detection of humidity comprising the steps of:
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(a) providing a substrate coated with vanillin acidified with sulfuric acid in acetone; and (b) exposing said substrate to a humid environment, said substrate changing from a first color to a second color as a function of the humidity to which said substrate has been exposed.
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2. A method for passive colorimetric detection of humidity comprising the steps of:
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(a) preparing a solution of vanillin that is acidified with sulfuric acid in acetone; (b) coating a substrate with said solution, said coated substrate characterized by a first color; and (c) exposing said substrate to a humid environment, said coated substrate changing from said first color to a second color as a function of the level of humidity to which said substrate has been exposed. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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9. A method for passive colorimetric detection of humidity comprising the steps of:
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(a) preparing a solution of vanillin that is acidified with sulfuric acid in acetone; (b) coating a substrate with said solution, said coated substrate changing color as a function of humidity; (c) exposing said substrate to a humid environment, said coated substrate changing from a first color to a second color as a function of the humidity level to which said substrate has been exposed; and (d) comparing said second color to a color wheel means for determining the humidity level. - View Dependent Claims (10, 11, 14, 15, 16, 17, 18)
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12. The method for passive colorimetric detection of humidity as claimed in 9, wherein said substrate is an optical wave guide.
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13. The method for passive colorimetric detection of humidity as claimed in 9, wherein said substrate is an fibre optic probe.
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