Patent ID: 9684248
Date: 2017-06-20
CPC Classifications: G03F,Y10T

Claim:
1. A lithographic apparatus configured to project a patterned beam of radiation onto a substrate via a projection optical system and via a liquid, the apparatus comprising: a substrate table and a first positioning system to which the substrate table is connected, the first positioning system configured to displace the substrate table into and out of a path of the patterned beam of radiation, the substrate table configured to hold the substrate; a sensor table and a second positioning system to which the sensor table is connected, the second positioning system configured to position the sensor table adjacent to the substrate table displaced into the path of the patterned beam of radiation, and to thereafter move the sensor table into the path of the patterned beam of radiation when the substrate table is displaced out of the path of the patterned beam of radiation; and a controller configured to control the first positioning system and the second positioning system, wherein the sensor table includes a top surface in which surfaces of a plurality of different sensors are arranged, the plurality of different sensors each being configured to sense different characteristics of radiation of the patterned beam of radiation projected to the sensor table, the controller is configured to control the first and second positioning systems to move the sensor table relative to the substrate table arranged in the path of the patterned beam of radiation such that the tables are close to each other, and to move the close tables relative to the projection optical system while the close tables are facing a base member such that the sensor table is positioned into the path of the patterned beam of radiation in parallel with displacement of the substrate table out of the path of the patterned beam of radiation and such that the liquid is kept in contact with a lower surface of the projection optical system during a replacing operation of the tables, while the substrate table and the sensor table are supported above an upper surface of the base member, and the sensor table arranged in the path of the patterned beam of radiation is moved such that the patterned beam of radiation is detected by one of the plurality of different sensors via the projection optical system and the liquid maintained between the projection optical system and the surface of one of the different sensors.