Patent ID: 11927482
Assignee: APPLIED MATERIALS, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. A method for calibrating an optical emission spectrometer (OES), comprising:
mounting a light fixture within a process chamber, wherein the light fixture includes a light source;
measuring an optical intensity of radiation from the light source with an OES located outside the process chamber at a first time;
removing the light fixture from the process chamber after measuring the optical intensity of radiation at the first time;
performing a deposition of a semiconductor substrate after measuring the optical intensity of radiation at the first time;
re-mounting the light fixture within the process chamber;
measuring an optical intensity of radiation from the light source with the OES located outside the process chamber at a second time;
comparing the optical intensity of radiation at the first time with the optical intensity of radiation at the second time; and
modifying the OES if the optical intensity of radiation at the first time is different than the optical intensity of radiation at the second time.