Crystal diffraction lens with variable focal length
Abstract
A method and apparatus for altering the focal length of a focusing element of one of a plurality of pre-determined focal lengths by changing heat transfer within selected portions of the element by controlled quantities is disclosed. 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. 19 figures.
- Inventors:
- Issue Date:
- OSTI Identifier:
- 7027747
- Patent Number(s):
- 5004319
- Application Number:
- PPN: US 7-291916
- Assignee:
- Dept. of Energy, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 29 Dec 1988
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; CONTROL SYSTEMS; DESIGN; LENSES; FLUID FLOW; FOCUSING; OPTICAL SYSTEMS; WORKING FLUIDS; FLUIDS; 420000* - Engineering
Citation Formats
Smither, R K. Crystal diffraction lens with variable focal length. United States: N. p., 1991.
Web.
Smither, R K. Crystal diffraction lens with variable focal length. United States.
Smither, R K. Tue .
"Crystal diffraction lens with variable focal length". United States.
@article{osti_7027747,
title = {Crystal diffraction lens with variable focal length},
author = {Smither, R K},
abstractNote = {A method and apparatus for altering the focal length of a focusing element of one of a plurality of pre-determined focal lengths by changing heat transfer within selected portions of the element by controlled quantities is disclosed. 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. 19 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 02 00:00:00 EST 1991},
month = {Tue Apr 02 00:00:00 EST 1991}
}
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