Further Understanding for Lissajous Figures

2021 ◽  
Vol 59 (1) ◽  
pp. 62-65
Author(s):  
Tiandong Li ◽  
Ruotong Zhu ◽  
Huilin Jin ◽  
Hongchun Yang ◽  
Minghe Wu ◽  
...  
Keyword(s):  

Author(s):  
William Krakow

An electronic device has been constructed which manipulates the primary beam in the conventional transmission microscope to illuminate a specimen under a variety of virtual condenser aperture conditions. The device uses the existing tilt coils of the microscope, and modulates the D.C. signals to both x and y tilt directions simultaneously with various waveforms to produce Lissajous figures in the back-focal plane of the objective lens. Electron diffraction patterns can be recorded which reflect the manner in which the direct beam is tilted during exposure of a micrograph. The device has been utilized mainly for the hollow cone imaging mode where the device provides a microscope transfer function without zeros in all spatial directions and has produced high resolution images which are also free from the effect of chromatic aberration. A standard second condenser aperture is employed and the width of the cone annulus is readily controlled by defocusing the second condenser lens.





2003 ◽  
Vol 34 (2) ◽  
pp. 122-127 ◽  
Author(s):  
Julio Castiñeira Merino


1989 ◽  
Vol 27 (2) ◽  
pp. 98-101
Author(s):  
John M. D’Mura






1946 ◽  
Vol 17 (3) ◽  
pp. 228-230 ◽  
Author(s):  
I. Bernard Cohen
Keyword(s):  


1985 ◽  
Vol 53 (3) ◽  
pp. 252-254 ◽  
Author(s):  
P. P. Ong ◽  
S. H. Tang


1976 ◽  
Vol 44 (11) ◽  
pp. 1144-1144
Author(s):  
Bruce G. Eaton ◽  
Doug N. Chard ◽  
M. Paul Hagelberg


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