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Inspection of Space Station Cold Plate Using Visual and Automated Holographic TechniquesReal-time holography has been used to confirm the presence of non-uniformity in the construction of an International Space Station cold plate. Ultrasonic C-scans have previously shown suspected areas of cooling fin disbonds. But both neural-net processed and visual holography did not evidence any progressive permanent changes resulting from 3000 pressurization and relaxation cycles of a Dash 8 cold plate. Neural-net and visual inspections were performed of characteristic patterns generated from electronic time-average holograms of the vibrating cold plate. Normal modes of vibration were excited at very low amplitudes for this purpose, The neural nets were trained to flag very small changes in the mode shapes as encoded in the characteristic patterns. Both the whole cold plate and a zoomed region were inspected. The inspections were conducted before, after, and during pressurization and relaxation cycles of the cold plate. A water-filled cold plate was pressurized to 120 psig (827 kPa) and relaxed for each cycle. Each cycle required 5 seconds. Both the artificial neural networks and the inspectors were unable to detect changes in the mode shapes of the relaxed cold plate. The cold plate was also inspected visually using real-time holography and double-exposure holography. Regions of non-uniformity correlating with the C-scans were apparent, but the interference patterns did not change after 3000 pressurization and relaxation cycles. These tests constituted the first practical application of a neural-net inspection technique developed originally with support from the Director's Discretionary Fund at the Glenn Research Center at Lewis Field.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Decker, Arthur J.
(NASA Glenn Research Center Cleveland, OH United States)
Melis, Matthew E.
(NASA Glenn Research Center Cleveland, OH United States)
Weiland, Kenneth E.
(NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1999
Subject Category
Instrumentation And Photography
Report/Patent Number
NAS 1.15:209388
Funding Number(s)
PROJECT: RTOP 478-34-10
Distribution Limits
Work of the US Gov. Public Use Permitted.
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