Patent ID: 9574875
Date: 2017-02-21
CPC Classifications: G01B,G01N

Claim:
1. A system, comprising: a wafer stage adapted to hold a semiconductor wafer thereon; a first pair of parallel rails which extend over the wafer stage; a mounting element that engages the first pair of parallel rails and which is configured to move between a plurality of different positions along the first pair of parallel rails; a moveable array of temperature sensors mounted on the mounting element and configured to take a plurality of temperature measurements at the plurality of different positions, respectively; and a controller adapted to direct the mounting element to move between the plurality of different positions and to direct the moveable array of temperature sensors to take the plurality of temperature measurements, wherein the controller is further adapted to, based on the plurality of temperature measurements, determine an expected thermal deformation for the semiconductor wafer or for a reticle arranged over the semiconductor wafer.