Patent ID: 8581187

Claim:
A method for measuring a sample by scanning a charged particle beam on the sample and measuring a pattern formed on the sample on the basis of charged particles given off from the sample, comprising the steps of: forming a first image of a first pattern formed by a first exposure of double patterning using a reduced projection exposure apparatus; combining information concerning the formed first pattern based on the first image and design information of a second pattern to be formed by a second exposure of the double patterning to thereby form a combined information template, the first image being of the formed first pattern prior to formation of the second pattern and not including the second pattern; forming a second image of the first and second patterns formed by said first and second exposures, respectively; performing a first pattern matching between the information concerning the formed first pattern in said combined information template and the first pattern in the second image to thereby obtain a first position of the design information of said second pattern; performing a second matching between the design information of the second pattern in said combined information template and information concerning the second pattern in said second image to thereby obtain a second position for the design information of said second pattern; and determining a displacement between the first and second positions.