Patent ID: 11874103
Assignee: ASML NETHERLANDS B.V.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A metrology apparatus for measuring a first substrate and a second substrate prior to them being sent to a separate lithographic apparatus for exposure, based on measurements made by the metrology apparatus, of the first and second substrates, the metrology apparatus comprising:
a first substrate stage configured to hold the first substrate or the second substrate;
a second substrate stage configured to hold the other of the first substrate or the second substrate;
a first measuring apparatus comprising an alignment sensor system to measure positions of a number of alignment marks on a substrate supported by the first substrate stage and/or the second substrate stage;
a second measuring apparatus; and
a processing system configured to control the apparatus to cause the first measuring apparatus and second measuring apparatus to simultaneously measure the first substrate and second substrate, respectively.