Published December 2002 | Version v1
Journal article Metadata-only

Image enhancement of Simplified ultrasonic CT using frequency analysis method

Creators

  • 1. Univ. of Windsor, Windsor (Canada)
  • 2. National Research Institute for Metals, Ibaraki (Japan)

Description

In this paper, a simplified ultrasonic CT system, which uses the information in three directions, that is, 90 .deg., +45 .deg. and -45 deg. about the inspection plane, is applied to the high strength steel, and the frequency analysis method for enhancing the C scan or CT image is developed. This frequency analysis method is based on the frequency response property of the material. By comparing the magnitudes in the frequency domain, the special frequency which shows a significant difference between the welded joint and base material was found and used to obtain a C scan or CT image. Experimental results for several kinds of specimens, having a welded joint by electron beam welding, a weld joint by arc welding, on a fatigue crack, showed that the obtained C scan or CT image has better resolution than the results of previous experiments using the maximum value of the received waveform

Additional details

Publishing Information

Journal Title
KSME International Journal
Journal Volume
16
Journal Issue
12
Series
6 refs, 10 figs
Journal Page Range
p. 1627-1632
ISSN
1226-4865

INIS

Country of Publication
Korea, Republic of
Country of Input or Organization
Korea, Republic of
INIS RN
36106280
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
CRACKS; DEFECTS; ELECTRON BEAM WELDING; FATIGUE; FREQUENCY ANALYSIS; IMAGES; NONDESTRUCTIVE TESTING; STEELS; ULTRASONIC WAVES
Descriptors DEC
ALLOYS; CARBON ADDITIONS; FABRICATION; IRON ALLOYS; IRON BASE ALLOYS; JOINING; MATERIALS TESTING; MECHANICAL PROPERTIES; SOUND WAVES; TESTING; TRANSITION ELEMENT ALLOYS; WELDING