Patent ID: 11959737
Assignee: UNITY SEMICONDUCTOR
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 8:
9. A system for characterising a structure etched in a substrate comprising:
an imaging arrangement comprising:
an imaging device, arranged on a top surface of said substrate, for capturing at least one image of the top surface of said substrate; and
a processing unit for measuring a first data relating to the structure etched in said substrate from at least one captured image;

a low-coherence interferometer, arranged on said top surface, for measuring with a measurement beam positioned on the structure at least one depth data relating to a depth of said structure; and
an adjustment unit for adjusting the measurement beam according to said first data which is measured before the measurement beam is adjusted by the adjustment unit, and wherein the low-coherence interferometer measures the at least one depth data relating to the depth of said structure with the adjusted measurement beam.