Patent ID: 11906302
Assignee: UNITY SEMICONDUCTOR
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 12:
13. A system for measuring using low coherence optical interferometry, for measuring a surface of a substrate comprising at least one structure, the system comprising:
an interferometric device, a light source, and an imaging sensor, for acquiring, with the imaging sensor, an interferometric signal formed by the interferometric device between a reference beam and a measurement beam reflected by said surface at a plurality of measurement points in a field of view; and
a processing module for processing acquired interferometric signals, configured in order to:
distribute the acquired interferometric signals according to homogenous regions of the field of view, where the regions are homogenous according to a predefined criterion;
for at least one measurement point, identify a class associated with a reference interferometric signal, representative of a typical structure, from the acquired interferometric signals in the homogeneous region to which the measurement point belongs;
classify, by a learning technique, the acquired interferometric signals according to a plurality of identified classes; and
carry out an analysis of the interferometric signals in order to derive therefrom an item of information on the structure at the measurement points, as a function of the class of each interferometric signal.