Patent ID: 11894214
Assignee: KLA CORPORATION
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 18:
19. A non-transitory computer-readable storage medium, comprising one or more programs for executing the following steps on one or more computing devices:
instructing an electron beam tool to emit an electron beam towards a specimen;
modulating the electron beam to obtain a beam signal, wherein the modulating is based on a wave that controls the beam signal, and wherein the modulating includes adjusting a beam current that reaches the specimen;
receiving electron data from an electron detector detecting secondary and/or backscattered electrons emitted by the specimen, wherein the electron data defines a detection signal;
determining a comparison between the wave controlling the beam signal and a wave for the detection signal; and
filtering the detection signal based on the comparison to obtain a filtered detection signal.