Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1977-10-13
1978-09-12
Ciarlante, Anthony V.
Measuring and testing
With fluid pressure
Porosity or permeability
73 493, G01N 1508
Patent
active
041127390
ABSTRACT:
A gas-tight chamber has positioned therein a material to be tested such that first and second opposite sides of the material are isolated from each other within the chamber. An enclosed reference circuit includes a first portion of the interior of the chamber which is on the first side of the material. A reference gas is continuously circulated through the reference circuit at the same pressure as the gas or vapor which exists in a second portion of the chamber which is on the second side of the material. This gas or vapor will permeate through the material, from the second side to the first side thereof, into the reference gas within the reference circuit as a function of the permeability of the material. A carrier circuit includes a gas chromatography detection apparatus, and a carrier gas of the same type of gas as the reference gas is continuously passed through the carrier circuit at a pressure higher than the pressure of the reference gas. A portion of the reference circuit is periodically switched to the carrier circuit, thereby injecting into the carrier circuit a portion of the reference gas, contaminated by the gas or vapor, such that the higher pressure carrier gas carries this portion of the contaminated reference gas to the detection apparatus, which then measures the amounts of the components of the gas or vapor in the contaminated reference gas as an indication of the permeability of the material.
REFERENCES:
patent: 3352146 (1967-11-01), Lyssy
patent: 3572096 (1971-03-01), Meyer
patent: 3926561 (1975-12-01), Lucero
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