Patent ID: 7372047
Filing Date: 2008-05-13
Classification: H01J

Abstract:
1. A charged particle beam apparatus comprising: a charged particle source; a charged particle optical system for focusing a charged particle beam emitted from said charged particle source and for scanning the focused charged particle beam on a material; a detector for detecting a secondary signal particle which is emitted from said material by being scanned by said charged particle beam; and a control apparatus for detecting an image which is formed by detecting said secondary signal particle, or for detecting periodic information of said material from a line profile, and for measuring an image magnification error based upon the detected periodic information, wherein the control apparatus detects said periodic information by way of an auto-correlation function method in a case that pixel number corresponding to a predetermined portion on said material is larger than a predetermined value, and detects said periodic information by way of a FFT transforming method in a case that pixel number corresponding to a predetermined portion on said material is equal to or smaller than a predetermined value.