Patent ID: 7782471
Filing Date: 2010-08-24
Classification: G01B,G01N

Abstract:
1. A method comprising: applying a first pulse of light to a surface of the sample for creating a propagating strain pulse in a sample, where the sample comprises a plurality of structures disposed on or within the sample; applying a second pulse of light to the surface so that the second pulse of light interacts with the propagating strain pulse in the sample; sensing from a reflection of the second pulse a change in optical response of the sample; and relating a time of occurrence of the change in optical response to at least one dimension of the structure, where relating comprises: applying a beam of light to the surface so that the beam of light generates a diffracted beam of light; determining at least one characteristic of the diffracted beam of light; and calculating a characteristic of the plurality of structures based at least in part on the at least one characteristic of the diffracted beam of light.