Patent ID: 6936842

Claim:
A substrate process inspection apparatus, comprising: a chamber comprising a chamber body and a lid defining a cavity, wherein the lid defines at least one port located to provide a field of view to a plasma region within the chamber; an energy transmissive window sealably disposed on the port; at least one receiver adapted to receive optical signals from the plasma through the port: a RF generator coupled through an RF transmissive path to the chamber; at least one RF power measuring system coupled to the RF transmissive path to detect and measure RE power being delivered within the chamber; and a processing system including one or more computer-readable programs adapted to generate information pertaining to the condition of the process, wherein for optical signal measurements the condition of the process is compared to at least one optical signal characteristic, and wherein for a power delivery measurement the condition of the process is compared to at least one RE power delivery value and a process controller that comprises a central processing unit, a memory, a timer, a storage, an input device, an output device and a bus.