Method and apparatus for detecting constituent changes in an environment
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United States of America Patent
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-
Jan 3, 2012
Grant Date -
Oct 2, 2008
app pub date -
Mar 26, 2008
filing date -
Mar 28, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An air monitoring apparatus includes, in an exemplary embodiment, a housing having at least one fluid passage to permit a fluid to enter the housing, and a constituent detection device positioned in the housing. The detection device includes at least one electrode, a power supply electrically coupled to the at least on electrode, and a logic circuit electrically coupled to the power supply. The logic circuit is configured to detect a change in at least one of impedance magnitude and a phase shift angle magnitude over a range of frequencies when the detection device contacts at least one fluid constituent contained in the fluid flowing into the cartridge through the at least one fluid passage, or when the detection device contacts at least one constituent in a solid whose chemical and/or material properties change as a function of fluid flowing into the housing through the at least one fluid passage.
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