Patent ID: 8441616
Filing Date: 2013-05-14
Classification: G03B,G03F

Abstract:
1. A lithographic apparatus comprising: a support constructed to support a patterning device, the patterning device being capable of imparting a radiation beam with a pattern in its cross-section to form a patterned radiation beam; a substrate table constructed to hold a substrate; a projection system configured to project the patterned radiation beam onto a target portion of the substrate, wherein the substrate table and/or the support is provided with an accelerometer to measure an acceleration of the respective substrate table and/or the support and the apparatus includes a calculator in communication with the accelerometer to calculate an acceleration based position signal from the acceleration measured by the accelerometer, and a measurement sensor to measure the position of the substrate table and/or the support, wherein the acceleration based position signal is selected by a controller to determine the position of the substrate table and/or the support if the measurement sensor is unable to measure the position of the substrate table and/or the support.