Patent ID: 8848049

Claim:
A charged particle beam device comprising: a charged particle beam source that generates a charged particle beam; means for detecting a secondary signal generated from a sample upon irradiation of the sample with the charged particle beam; means for converting the secondary signal into an electrical signal; means for amplifying a signal amplitude of the electrical signal; means for controlling a scan speed of the charged particle beam; means for calculating a degradation function between a first electrical signal and a second electrical signal, the first electrical signal being acquired when the charged particle beam is scanned at a first speed, which results in the first electrical signal being subjected to a band limitation of an electrical signal path, and the second electrical signal being acquired when the charged particle beam is scanned at a second speed, which does not result in the second electrical signal being subjected to the band limitation of the electrical signal path; means for calculating an inverse function of the degradation function as a correction filter; means for generating the second electrical signal by applying the correction filter to the first electrical signal; and means for updating the correction filter, wherein the degradation function is calculated using the first electrical signal and the second electrical signal by quantifying the degradation of the first electrical signal as compared to the second electrical signal.