Patent ID: 9076632
Filing Date: 2015-07-07
Classification: G01N,H01J

Abstract:
1. A High Angle Annular Dark Field (HAADF) detector assembly operating within a Scanning Transmitting Electron Microscope (STEM), provided to detect electrons emitted from a sample that is being scanned by an electron beam, comprising: a scintillator comprising an annular scintillating plate having a scintillating surface and a central aperture configured to enable passage of non-scattered electrons, the scintillating surface emitting light signals corresponding to impingement of scattered electrons thereupon; a two-dimensional sensor having a light sensing surface and plurality of electrical outputs; an optical imaging system configured to form an image of the scintillating surface on the light sensing surface of the two-dimensional sensor by transferring light signals produced in any specific location of the scintillating surface onto a corresponding position on the light sensing surface and thereby maintaining spatial information of the light signals; and, an image processing unit receiving output signals from plurality of electrical outputs of the two-dimensional sensor and providing information of images related to selected positions of the electrons impinging the scintillation surface.