Patent ID: 8079249
Filing Date: 2011-12-20
Classification: G01N

Abstract:
1. A method for Gas Permeability Measurement of a target porous specimen comprising steps of: Supplying a first predetermined amount of liquid in a first container; Supplying and storing a second predetermined amount of liquid to a second container, wherein the surface level of said second predetermined amount of liquid reaches a predetermined level in said second container; Discharging excessive amount of liquid above said predetermined level in said second container by connecting a drainage pipe to said second container; Releasing a third predetermined amount of liquid from said first container to a liquid and gas traveling zone wherein said liquid and gas traveling zone comprises of a first end and a second end, and at least a first sensor and a second sensor which are mounted on a stand attached to said liquid and gas traveling zone, and wherein said second end is immersed in said second predetermined amount of liquid in said second container, and wherein said second end of said liquid and gas traveling zone is sealed to maintain said third predetermined amount of liquid in said liquid and gas traveling zone at a first level in said liquid and gas traveling zone, and wherein said first level in said liquid and gas traveling zone is above said at least first and second sensors; Placing said target porous specimen at said first end of said liquid and gas traveling zone; Measuring a traveling time of said third predetermined amount of liquid traveling between said at least first sensor and second sensor by unsealing said second end of said liquid and gas traveling zone; Calculating a gas permeability value for said target porous specimen based on said a traveling time according to: Where: k V C=correction factor for gas expansion as a result of change in static head and viscosity of liquid; L=length of target porous specimen (m); P z t=time (s); A=cross-sectional area of target porous specimen (m Δz=change in height of liquid during time t (m); V