Fluid detection device and method

Details Fluid detection device and method Fluid detection device and method

1984-06-25

1986-07-08

Kreitman, Stephen A.

Measuring and testing

Gas content of a liquid or a solid

By vibration

G01N 710

Patent

active

045985766

ABSTRACT:
A fluid detector device and method capable of detecting the presence of a first fluid such as a gas, which may be mixed with a second fluid, in an external atmosphere where the first fluid is a hydrocarbon gas such as methane or the like, mixed with air, a semi permeable membrane, which extends across an opening of a detection chamber is utilized. Air and the gas have different rates of permeability across the membrane causing a volume change in the chamber. A volume sensitive device signals the presence of the gas. A displaceable element is shiftable in response to the volumetric change in the chamber, allowing the change without significant pressure changes. A capacitive plate can be integral with a displaceable element so that capacitance varies with the change in volume caused by the presence of the gas.

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patent: 4208902 (1980-06-01), Kim et al.
patent: 4357834 (1982-11-01), Kimura
patent: 4428776 (1984-01-01), Li

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