Patent ID: 8171775
Filing Date: 2012-05-08
Classification: G01N

Abstract:
1. A system for determining a permeance of a material, the system comprising: a material test sheet having a first surface and an opposing second surface; a collection chamber having a first fluid source line; a first fluid source for continuously flowing a first fluid at a first pressure into the collection chamber through the first fluid source line; a fluid reservoir containing a second fluid; a fixture for disposing the material test sheet between the fluid reservoir and the collection chamber wherein (a) a test area of the first surface of the material test sheet is exposed to the second fluid and (b) the area on the second surface of the material test sheet that opposes the test area of the first surface is exposed to the first fluid in the collection chamber, whereby a portion of the second fluid permeates through the test area into the collection chamber to form in the collection chamber an output mixture of the permeated second fluid and the first fluid at a concentration level; a collection removal line for removing substantially all of the output mixture; and a pressure gauge in pressure communication with the collection removal line, for measuring a second pressure of the output mixture in the collection removal line; and a concentration meter configured to measure the concentration level of the second fluid in the output mixture exiting from the collection chamber through the collection removal line, wherein the permeance of the material is determined using the first pressure, the second pressure, and the concentration level of the second fluid in the output mixture.