Patent ID: 11915953
Assignee: APPLIED MATERIALS, INC.
Field: Measurement (Instruments)
Classification: CPC H  F  G | IPC G  H

Claim 6:
7. A non-transitory computer-readable medium comprising instructions that, when executed, cause a thermal processing chamber system to:
heat a first substrate disposed on an edge ring in a processing volume of a chamber body to a first temperature using a plurality of heat lamps;
cool the first substrate to a second temperature that is lesser than the first temperature;
cause a first distance sensor mounted to an exterior of a sidewall of the chamber body to:
emit a first signal through a window of the sidewall towards a radial outer surface of the edge ring, the radial outer surface facing the sidewall, such that the first signal reflects off the radial outer surface to become a first reflected signal; and
receive, through the window, the first reflected signal;

cause a second distance sensor to:
emit a second signal towards the radial outer surface of the edge ring such that the second signal reflects off the radial outer surface to become a second reflected signal; and
receive the second reflected signal;

measure a first distance between the first distance sensor and the radial outer surface of the edge ring using the first reflected signal;
measure a second distance between the second distance sensor and the radial outer surface of the edge ring using the second reflected signal;
perform repeat measurements of the first and second distances while rotating the edge ring;
determine a center position shift of the edge ring by analyzing phase differences between the first and second distances;
determine a corrected landing position using the center position shift; and
instruct a robot to align a second substrate with the corrected landing position.