Patent ID: 6716477
Filing Date: 2004-04-06
Classification: C23C

Abstract:
A process exhaust gas monitoring device that monitors the amount of each component of process exhaust gas containing a plurality of gas components resulted from a process carried out in a process chamber for a process object under predetermined process conditions, said device comprising:gas sampling means for sampling the process exhaust gas, said gas sampling means being connected to an exhaust port of an exhaust vacuum pump that evacuates the process exhaust gas from the process chamber; gas analysis means for analyzing each component of the sampled process exhaust gas; comparison means for comparing an analysis result from the gas analysis means with a reference analysis result of the process exhaust gas generated from a process carried out under reference process conditions; and detection means for generating and outputting a signal indicating a process error, when it is determined from the comparison result from the comparison means that the amount of at least one gas component of the process exhaust gas has changed to an amount that is outside a predetermined range set around a reference value obtained from the reference analysis result.