DUAL ENERGY RADIOGRAPHY: A POTENTIAL CORROSION DETECTION TECHNIQUE

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Authors
  1. Leblanc, J.D.
  2. Finlayson, R.D.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
The recent demand for extending the service life of aircraft fleets well beyond the original design life has made the early detection of corrosion in aircraft a major concern. Consequently, many nondestructive techniques to improve corrosion detection are being investigated. One potential method is known as "Dual-Energy" (DE) radiography and is based on the analysis of two digital radiographs taken at different effective energies. This is achieved by producing two effective radiation energies, either by changing the radiation source energy or by filtering and collecting the radiation from one source via filtered detectors. The information collected from the two digital radiographs can be combined to form a single digital image that can be used to determine an unknown substance or to remove the effect of a particular substance to improve radiographic contrast. In this report the theory and concepts of DE are examined and a number of existing systems are discussed. Finally, the possibility of implementing a DE system at the Defence Research Establishment Pacific is investigated.
Keywords
CORROSION DETECTION
Report Number
DREP-TM-94-05 — Technical Memorandum
Date of publication
01 Feb 1994
Number of Pages
42
DSTKIM No
95-00097
CANDIS No
146068
Format(s):
Hardcopy;Document Image stored on Optical Disk

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