Simultaneous drift, microsaccades, and ocular microtremor measurement from a single noncontact far-field optical sensor

2015 ◽  
Vol 20 (2) ◽  
pp. 027004 ◽  
Author(s):  
James P. Ryle ◽  
Brian Vohnsen ◽  
John T. Sheridan
2013 ◽  
Vol 18 (1) ◽  
pp. 016010 ◽  
Author(s):  
Emer Kenny ◽  
Davis Coakley ◽  
Gerard Boyle

2001 ◽  
Vol 40 (1) ◽  
pp. 167 ◽  
Author(s):  
Gerard Boyle ◽  
Davis Coakley ◽  
Jim F. Malone

1993 ◽  
Vol 31 (3) ◽  
pp. 205-212 ◽  
Author(s):  
N. F. Sheahan ◽  
D. Coakley ◽  
F. Hegarty ◽  
C. Bolger ◽  
J. Malone

Author(s):  
N. Bonnet ◽  
M. Troyon ◽  
P. Gallion

Two main problems in high resolution electron microscopy are first, the existence of gaps in the transfer function, and then the difficulty to find complex amplitude of the diffracted wawe from registered intensity. The solution of this second problem is in most cases only intended by the realization of several micrographs in different conditions (defocusing distance, illuminating angle, complementary objective apertures…) which can lead to severe problems of contamination or radiation damage for certain specimens.Fraunhofer holography can in principle solve both problems stated above (1,2). The microscope objective is strongly defocused (far-field region) so that the two diffracted beams do not interfere. The ideal transfer function after reconstruction is then unity and the twin image do not overlap on the reconstructed one.We show some applications of the method and results of preliminary tests.Possible application to the study of cavitiesSmall voids (or gas-filled bubbles) created by irradiation in crystalline materials can be observed near the Scherzer focus, but it is then difficult to extract other informations than the approximated size.


Sign in / Sign up

Export Citation Format

Share Document