Patent ID: 8258471
Filing Date: 2012-09-04
Classification: G01B,H01J

Abstract:
1. A pattern measuring apparatus comprising: a display unit; an irradiation unit for irradiating a sample with a charged particle beam; a first electron detector and a second electron detector for detecting an amount of electrons emitted from the sample with a pattern by the irradiation with the charged particle beam, the first electron detector and the second electron detector arranged with an optical axis of the charged particle beam in between; an image processor for generating image data of the pattern on the basis of the amount of electrons; and a controller for calculating a subtracted signal by subtracting a signal detected by the second electron detector from a signal detected by the first electron detector, causing the image processor to generate the image data of the pattern on the basis of an amount of electrons corresponding to the subtracted signal, and displaying an image corresponding to the image data on a screen of the display unit.