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X ray based displacement measurement for hostile environmentsA new method on noncontacting, high temperature extensometry based on the focus and scanning of x rays is currently under development and shows great promise of overcoming limitations associated with available techniques. The chief advantage is the ability to make undisturbed measurements through stratified or flowing gases, smoke, and flame. The system is based on the ability to focus and scan low energy, hard x rays such as those emanating from copper or molybdenum sources. The x rays are focused into a narrow and intense line image which can be scanned onto targets that fluoresce secondary x ray radiation. The final goal of the system is the ability to conduct macroscopic strain measurements in hostile environments by utilizing two or more fluorescing targets. Current work is limited to displacement measurement of a single target with a resolution of 1.25 micro-m and a target temperature of 1200 C, directly through an open flame. The main advantage of the technique lies in the penetrating nature of x rays which are not affected by the presence of refracting gas layers, smoke, flame, or intense thermal radiation, all of which could render conventional extensometry methods inoperative or greatly compromise their performance.
Document ID
19920013912
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Canistraro, Howard A. (Connecticut Univ. Storrs., United States)
Jordon, Eric H. (Connecticut Univ. Storrs., United States)
Pease, Douglas M. (Connecticut Univ. Storrs., United States)
Fralick, Gustave C. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1992
Subject Category
Instrumentation And Photography
Report/Patent Number
NASA-TM-105551
NAS 1.15:105551
E-6872
Accession Number
92N23155
Funding Number(s)
CONTRACT_GRANT: NAG3-1004
PROJECT: RTOP 505-90-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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