Method and apparatus for detecting constituent changes in an environment
US8089367B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2008 |
| Grant date | Jan 3, 2012 |
| Priority date | — |
| Expiry date | Feb 4, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0256
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.