Patent ID: 7619751

Claim:
A scanning electron microscope comprising: an electron detector for detecting a second electron obtained from a specimen by irradiation of an electron beam, and an information processor for carrying out processing by using a signal obtained from the electron detector; wherein the information processor carries out: averaging processing of the signal in Y-direction which is a line pattern longitudinal direction included in the specimen by a first averaging parameter and a second averaging parameter defining a range of an averaging; generating a first X-coordinate group in each of the Y-coordinate corresponding to a line pattern edge of the signal averaged by the first averaging parameter and a second X-coordinate group in each of the Y-coordinate corresponding to a line pattern edge of the signal averaged by the second averaging parameter, by input of a parameter concerned with a sampling interval in the Y-direction of the line pattern; calculating a value of a first standard deviation of the first X-coordinate group and value of a second standard deviation of the second X-coordinate group, and outputting a value of a standard deviation of edge roughness of said line pattern, by using the first and second averaging parameter, a value of the first and second standard deviation, a function representing a relation between the averaging parameter and a value of standard deviation of the X-coordinate.