Patent ID: 9677944
Date: 2017-06-13
CPC Classifications: G01J

Claim:
1. An in-situ temperature measurement system for a wafer treatment reactor, the system comprising: (a) a wafer support element having a rotational axis; (b) a heating element for the wafer support element; (c) a first operating pyrometer adapted to receive radiation from a first portion of the wafer support element at a first radial distance from the rotational axis; and (d) a wafer temperature measurement device located at a first position, the wafer temperature measurement device in the first position being adapted to receive radiation from at least one wafer disposed on the wafer support element at the first radial distance from the rotational axis, wherein the first operating pyrometer is sensitive to radiation in a first wavelength band, the wafer temperature measurement device is sensitive to radiation in a second wavelength band, and the at least one wafer is translucent or transparent to radiation in the first band and opaque to radiation in the second band.