Selected Area Optical Transforms in Real Time
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-09
Presently, two methods exist for obtaining the optical transform of an electron microscope image after the micrograph has been taken. In one of these methods, a transparency is placed in an optical diffractometer, while in a second method the electron microscope image is digitized in the frame store to obtain its Fourier transform. Both methods can use field stops when images are placed in the respective systems, but both methods are offline. That is, a photographic transparency or print must fir be produced, after which an aperture is placed over it to obtain a selected field of view. In order to overcome this difficulty, an online electronic aperture is used for forming optical transforms.