Level Sensor and Lithographic Apparatus

• Main Authors: HUISMAN, Simon Reinald, REIJNDERS, Marinus Petrus
• Format: Patent
• Language: English
• Published: 11.03.2021
• Subjects: APPARATUS SPECIALLY ADAPTED THEREFOR; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY; MATERIALS THEREFOR; ORIGINALS THEREFOR; PHOTOGRAPHY; PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES; PHYSICS

The invention provides a level sensor to measure a position of a surface of a substrate, comprising a projection unit arranged to direct a beam of radiation to the surface of the substrate and a detection unit. The detection unit comprises a detection grating arranged to receive the beam of radiatio...