Patent ID: 9002097
Filing Date: 2015-04-07
Classification: G01N,G03F,G06K,G06T,H01J

Abstract:
1. An inspection system for inspecting a sample comprising: a charged particle beam generator for generating a primary charged particle beam; a condenser lens module arranged below the charged particle beam generator and adapted for condensing the primary charged particle beam; a probe forming objective lens module arranged below the condenser lens module and adapted for focusing the condensed primary charged particle beam into a charged particle beam probe; a charged particle beam deflection module arranged below the condenser lens module for deflecting the charged particle beam probe to a surface of the sample; a secondary charged particle detector module for detecting a secondary charged particle detection signal generated from the sample; an image forming module communicated with the secondary charged particle detector module for receiving the secondary charged particle detection signal and forming at one or more frames; and a noise-filtering module communicated with the image forming module and encoded with a computer program for determining a defect, wherein the computer program performs the following steps: recording a sequence of grayscales of a pixel of the frames scanned by the charged particle beam; removing extreme values from the sequence of grayscales; and determining a nominated grey level of the pixel from remained grayscales.