Engineering topics
Frayer, Daniel
Publications and source records attributed to Frayer, Daniel.
Shock State Distributions in Porous Tantalum Using Multipoint PDV.
Abstract not provided.
Advanced characterization of spatial aspects of image system blurNLV-004-19, Year 3 of 3
Presentation to be presented during the Site-Directed Research and Development (SDRD) program FY 2021 review meeting (Webex), September 22–23, 2021.
An approach to characterizing spatial aspects of image system blur
Quantitative X-ray radiographic imaging systems that utilize a charged couple device (CCD) camera connected to a thick, monolithic scintillator can exhibit blur that varies spatially across the field of view, especially for thick scintillators used in pulse-power radiography of dynamically compressed objects. Here, a three-point approach to estimating and accounting for this effect is demonstrated by (a) using a local estimation technique to measure the effect of blurring a calibration object at key locations across the field of view, (b) combining each of the local estimates into a spatially varying blurring function via partitions of unity interpolation, and (c) resolving the effects of that blur on the image by solving an ill-posed inverse problem using a spatially varying regularization term. The technique is demonstrated on synthetic examples and actual radiographs collected at the Naval Research Laboratory’s (NRL)Mercury pulsed power facility.
An Approach to Characterizing Spatial Aspects of Image System Blur
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