Patent ID: 8101934
Filing Date: 2012-01-24
Classification: G01V

Abstract:
1. An apparatus, comprising: a through-beam sensor coupled to a scrubber and adapted to detect a notch or flat of a substrate in the scrubber during processing; a controller coupled to the through-beam sensor and adapted to filter noise while the through-beam sensor detects the notch or flat of the substrate; wherein the scrubber includes a base and a plurality of rollers proximate to each other and mounted to the base, the plurality of rollers adapted to support the substrate in a vertical orientation as the base positions the plurality of rollers along a lower portion of an edge of the substrate; a sensor mounting bracket coupled to the base, wherein the sensor mounting bracket couples the through-beam sensor to the scrubber and positions the through-beam sensor along the lower portion of the edge of the substrate; the through-beam sensor having: