Patent ID: 6958630
Filing Date: 2005-10-25
Classification: G01R

Abstract:
1. A high frequency detection method for detecting information about a first high frequency power in a plasma generator, for generating plasma, by supplying said first high frequency power having a first frequency to a reaction chamber via a first power supply line and supplying a second high frequency power having a second frequency lower than said first frequency to said reaction chamber via a second power supply line, said first high frequency power being modulated by said second high frequency power to generate a third high frequency power having a third frequency in said reaction chamber, said high frequency detection method comprising: a first step of detecting a first high frequency signal having components of said first and third frequencies propagating through said first power supply line; a second step of generating a second high frequency signal having a frequency which is a sum of said first frequency and a predetermined fourth frequency between said first and second frequencies, or said second high frequency having a frequency which is a difference between said first frequency and the predetermined fourth frequency which is between said first and second frequencies; a third step of generating a third high frequency signal by mixing said first and second high frequency signals; a fourth step of extracting a fourth high frequency signal having said fourth frequency from said third high frequency signal; and a fifth step of obtaining the information about said first high frequency power based on said fourth high frequency signal.