Patent ID: 9245786
Filing Date: 2016-01-26
CPC Classification: H01L

Claim Text:
1. An apparatus for processing a substrate, comprising: a chamber body defining an inner volume; a non-contact substrate positioning assembly disposed in the inner volume, wherein the non-contact substrate positioning assembly is capable of moving a substrate at least within a horizontal plane; a first capacitive sensor disposed in an upper surface of the non-contact substrate positioning assembly, wherein the first capacitive sensor is positioned to measure a distance between a location of an edge of the substrate at a first angular location in the horizontal plane and a first target position at the first angular location in the horizontal plane; a second capacitive sensor positioned in the upper surface, wherein the second capacitive sensor is positioned to measure a distance between a location of the edge of the substrate at a second angular location in the horizontal plane and a second target position at the second angular location in the horizontal plane; a third capacitive sensor positioned in the upper surface, wherein the third capacitive sensor is positioned to measure a distance between a vertical location of the substrate and the third capacitive sensor, wherein the first, second and third capacitive sensors are configured to operate in temperatures between about 400° C. and about 1000° C.; a plurality of ports formed through the upper surface, the plurality of ports configured to support and rotate a substrate over the upper surface by delivering fluid flows towards the substrate, wherein the first capacitive sensor is aligned with a first port of the plurality of ports along a first radius extending from a center of the upper surface of the non-contact substrate positioning assembly; and a controller coupled to the first, second, and third capacitive sensors, wherein the controller is configured to determine a vertical position of the substrate from a measurement of the third capacitive sensor, and to determine a distance of the edge of the substrate at the first angular location from the first target position by using a measurement of the first capacitive sensor and the vertical position of the substrate.