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X-ray beam method for displacement measurement in hostile environmentsA new method of extensometry using an X-ray beam was devised, and the results of current testing reveal it to be highly feasible. This technique has been shown to provide a non-contacting system that is immune to problems associated with density variations in gaseous environments, that plague currently available optical methods. This advantage is a result of the non-refracting penetrating nature of X-rays. The method is based on X-ray-induced X-ray fluorescence of targets, which subsequently serve as fudicial markers. Some target materials have melting points over 1600 degrees C which will facilitate measurement at extremely high temperatures. A highly focused intense X-ray beam, which is produced using a Johansen 'bent crystal', is then scanned across the target, which responds by fluorescing X-rays when stimulated by the incident beam. This secondary radiation is monitored using a detector. By carefully measuring beam orientation, change in target edge position can be determined. Many variations on this basic theme are now possible such as two targets demarcating a gage length, or a beam shadowing method using opaque targets.
Document ID
19900057430
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jordan, Eric H.
(Connecticut Univ. Storrs, CT, United States)
Pease, D. M.
(Connecticut Univ. Storrs, CT, United States)
Canistraro, H.
(Connecticut Univ. Storrs, CT, United States)
Brew, Dale
(Connecticut, University Storrs, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: Hostile Environments and High Temperature Measurements
Location: Kansas City, MO
Country: United States
Start Date: November 6, 1989
End Date: November 8, 1989
Accession Number
90A44485
Funding Number(s)
CONTRACT_GRANT: NAG3-1004
Distribution Limits
Public
Copyright
Other

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