Patent ID: 8271211
Filing Date: 2012-09-18
Classification: G01F,Y10T

Abstract:
1. A method of computing rate at which gas flows out of a processing chamber gas stick, the method comprising: stopping the flow of gas into the gas stick at a first location which is upstream of a second location where gas is flowing out of the gas stick, obtaining a plurality of measurements of the gas in a volume in fluid communication with, and located in between, said first and second gas stick locations, applying one or more criteria to determine if any measurements should be excluded from gas flow calculation, excluding any measurements from gas flow calculation that meet said criteria, performing a gas flow calculation, where the gas flow calculation includes using at least two non-excluded measurements to compute the rate of gas flow out of said volume by calculating the rate of decrease in moles of the gas in the volume using a derivative of ideal gas law, and providing results of the gas flow calculation via a system interface.