Experimental Analysis and Calculation of Electron Diffraction Cameral Length in TEM

The camera length of electron diffraction in transmisson electron microscopy(TEM) is one of the main technical parameters in designing electron microscope and the electron diffraction analysis to microcrystal sample.According to Bragg law,the formula of calculating TEM electron diffraction camera length is derived from the(research) on the ray path of electron diffraction images in TEM and the comparison on electron diffraction with ordinary electronic diffractometer.The difference of physical significance of electron diffraction camera length between TEM and ordinary electronic diffractometer is discussed.The resolution index of electron diffraction in TEM is analyzed.The exactly experimental method is given for demarcating electron diffraction camera length by Gold-monocrystal in TEM.