Laminated wafer for sensing and monitoring exposure to gases
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United States of America Patent
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Sep 20, 1988
Issued Date -
N/A
app pub date -
May 19, 1986
filing date -
Nov 18, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a disposable laminated colorimetric gas monitoring wafer for sensing and monitoring exposure to a selected gas. Opposed gas impermeable layers, such as plastic, generally enclose a carrier medium, such as a sorbent, which carries a color-forming chromophore composition that changes color in response to exposure to a selected gas. A porous, hydrophobic membrane exposed through an opening in one outer plastic layer, overlays the carrying medium and the chromophore composition. Wind and moisture effects are reduced by the porous membrane, and the porous hydrophobic membrane also prevents relative humidity from effecting the color of the chromophore composition.
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