THE DEVELOPMENT OF AN IN-MOTION RADIOGRAPHY SYSTEM FOR LARGE AREA AIRCRAFT SCANNING

Authors
  1. Finlayson, R.D.
  2. Cornes, J.K.
  3. Liesch, D.S.
  4. Sturrock, W.R.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
An In-Motion Radiography System (IMRS) has been developed by the Defence Research Establishment Pacific (DREP). The system includes a portable x-ray unit, adapted for the requirements of in-motion radiography, and an x-y scanning arrangement to allow large area scanning. Two separate experiments were performed, each with a different slit length set on a focusing collimator. A long slit length allowed a fast scan that exposed the film in one pass of the x-ray tube, creating a low resolution radiograph. A shorter slit length was set to allow for exposure of the film in several strips, thus eliminating the parallax error ("blurring" caused by the cone shaped radiation field) and creating a higher resolution radiograph. The results show that an IMRS is a fast and reliable technique for inspecting large aircraft surfaces. Inspection of helicopter rotor blades for water ingress in honeycomb is seen as one possible use for the IMRS, especially for very large blades such as those found on the proposed new helicopter, the EH101. In-motion radiography is simple and is based on standard radiographic procedures with some slight modifications in the exposure settings. Almost any radiography system could be adapted to use in-motion radiography if the tube of the part is able to move in the desired scanning motion.
Keywords
IMRS (IN-MOTION RADIOGRAPHY SYSTEM)
Report Number
DREP-TM-93-53 — Technical Memorandum
Date of publication
01 Jul 1993
Number of Pages
22
DSTKIM No
94-00099
CANDIS No
134989
Format(s):
Hardcopy;Originator's fiche received by DSIS

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