04428235 is referenced by 23 patents and cites 5 patents.

A method of inspecting non-destructively a specimen for examining the presence or absence of a defect in the specimen, in which an ultrasonic wave is emitted from a probe and a reflected wave from the specimen is received by the probe whose output signal is processed to determine the presence or absence of the defect. The signal processing includes steps of extracting characteristic parameters from a frequency spectrum of the ultrasonic echo and comparing the extracted parameter with corresponding experimentally or theoretically determined values. The invention makes it possible to automatically determine discriminatively whether the reflector of the ultrasonic echo is a configured portion, a weld boundary or a defect of a specimen to be inspected.

Title
Non-destructive inspection by frequency spectrum resolution
Application Number
6/274428
Publication Number
4428235
Application Date
June 17, 1981
Publication Date
January 31, 1984
Inventor
Sakae Sugiyama
Ibaraki
JP
Agent
Thomas E Beall Jr
Assignee
Hitachi
JP
IPC
G01N 29/04
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