Patent ID: 7978340
Filing Date: 2011-07-12
Classification: G01B,G03F

Abstract:
1. A system for determining positions of structures on a substrate comprising: at least one measurement table movable in the X-coordinate direction and in the Y-coordinate direction; a measurement objective; a camera for determining the positions of the structures on the substrate; at least one interferometer for determining the position of the measurement objective and/or the measurement table with respect to a coordinate system; a housing representing a climatic chamber surrounding the system; a magazine for substrates and/or a loading station for substrates is provided in the climatic chamber, wherein a transport means is provided in the housing, which transports the substrates between the loading station and/or the magazine and/or the measurement table; an active control means associated with the climatic chamber so that for a duration of a measurement of a substrate, an air pressure within the climatic chamber is set at a single, defined, constant level with respect to a current ambient air pressure; and a display via which a warning is output to the user of the system in case the ambient air pressure rises above a the constant level within the climatic chamber, while the substrate is measured.