Resolving cone-axis camera

Details Resolving cone-axis camera Resolving cone-axis camera

1975-11-17

1977-03-29

Borchelt, Archie R.

Radiant energy

Coded record and readers; invisible radiant energy type

250274, G01N 2320

Patent

active

040151255

ABSTRACT:
A resolving cone-axis camera which imparts an additional translation motion to the film as the diffraction spots from the precessing crystal impinge upon the film. This translation motion is in the plane of the film and is such that a predetermined offset point on the film is caused to move along a circular path having the intersection of the crystal axis and the film plane as its center. The additional motion of the film results in a photograph having concentric annuli of given width formed by the diffraction spots from successive levels of the reciprocal lattice. The distance between the chosen offset point and the crystal axis intersection point determines the width of the annuli, and the offset point may be chosen at any point on the film which is within a circle having the crystal axis intersection point as its center and having a radius equal to the distance between the crystal axis intersection point and the beam axis intersection point. One embodiment of the resolving cone axis camera is described wherein the film holder which imparts the translation motion to the film consists of three parallel interleaved plates wherein the second plate is free to move horizontally with respect to the first plate and the third plate to which the film is attached, is free to move vertically with respect to the second plate. A circular cam whose center is offset from the crystal axis rotates eccentrically about the crystal axis and provides the third plate and the film thereon with the desired translation motion.

REFERENCES:
patent: 3108185 (1963-10-01), Buerger
patent: 3848126 (1974-11-01), Swindells et al.
patent: 3903415 (1975-09-01), Holzapfel

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