Crystal diffraction lens with variable focal length

Patent · Tue Jan 01 00:00:00 EST 1991

OSTI ID:867760

Smither, Robert K ^[1]

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1. Hinsdale, IL

A method and apparatus for altering the focal length of a focusing element o one of a plurality of pre-determined focal lengths by changing heat transfer within selected portions of the element by controlled quantities. Control over heat transfer is accomplished by manipulating one or more of a number of variables, including: the amount of heat or cold applied to surfaces; type of fluids pumped through channels for heating and cooling; temperatures, directions of flow and rates of flow of fluids; and placement of channels.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31109-ENG-38
• Assignee: United States of America as represented by Department of Energy (Washington, DC)
• Patent Number(s): US 5004319
• OSTI ID: 867760
• Country of Publication: United States
• Language: English

Related Subjects

crystal
diffraction
lens
variable
focal
length
method
apparatus
altering
focusing
element
plurality
pre-determined
lengths
changing
heat
transfer
selected
portions
controlled
quantities
control
accomplished
manipulating
variables
including
amount
cold
applied
surfaces
type
fluids
pumped
channels
heating
cooling
temperatures
directions
flow
rates
placement
focal length
heat transfer
selected portion
selected portions
crystal diffraction
focusing element
focal lengths
changing heat
controlled quantities
/359/378/