Method and apparatus for measuring the temperature of objects on a fast moving holder

摘要

Apparatus and method for determining a real time, non-contact temperature measurement of semiconductor wafers are provided in a computer-based data gathering system. The apparatus includes a moving carrier containing semiconductor wafers and a pyrometer and a reflectometer positioned above the spinning wafer carrier for providing temperature and reflectivity data samples taken from the semiconductor wafers and spinning carrier. The data are then provided to an attached computer. The attached computer receives the reflectivity and temperature data pairs, stores them in a data table and records the frequency of occurrence of each of the reflectivity values in the series of reflectivity and temperature data. Software operating on the computer has instructions for identifying at least one reflectivity data peak representative of the reflectivity characteristics of the semiconductor wafers and instructions for determining the temperature of the semiconductor wafers based upon the frequency of occurrence of the reflectivity data and the associated reflectivity-temperature data.