Patent Document ID: 10041873
Application ID: 15582331
Patent Flag: 1

Claim One:
1. A measurement system comprising: an illumination source configured to provide a first amount of illumination light to one or more metrology targets disposed on a specimen; a vapor injection system configured to provide a first gaseous flow including a first fill material in a vapor phase to the one or more metrology targets during the illumination of the one or more metrology targets, wherein a portion of the fill material is condensed onto the one or more metrology targets in a liquid phase, and wherein the portion of fill material fills at least a portion of a space between one or more geometric, structural features of the one or more metrology targets; a detector configured to receive a first amount of collected light from the one or more metrology targets in response to the first amount of illumination light and generate a first set of measurement signals indicative of the first amount of collected light; and a computing system configured to: estimate a value indicative of a porosity of the one or more metrology targets based at least in part on the first set of measurement signals and a measurement model.