Title:
METHOD OF SETTING SENSITIVITY OF ULTRASONIC FLAW DETECTING DEVICE
Document Type and Number:
Japanese Patent JP3228404
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To set detecting sensitivity so that non-sensitive band is minimized when pulse compression processing by digital signal processing is applied in ultrasonic flaw detection.
SOLUTION: In this method, a received signal is amplified by an amplifier 1, and A/D converted by an A/D converter 2, the correlation between a reference signal similar to a transmitted signal and the A/D converted received signal is taken by use of an FIR filter 3, whereby pulse compression of the received signal is performed, and the sensitivity of an ultrasonic detector for judging a defect is set in an evaluation part 4 on the basis of the pulse compressed received signal.. In this case, the amplification degree of the amplifier 1 is set so that the boundary surface echo of the received signal, is not saturated by the A/D converter 2, and the output bit of the FIR filter 3 inputted to the evaluation part 4 is determined so that the defect echo after pulse compression is within the range of a desired size in the evaluation part 4.
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Inventors:
Yukinori Iizuka
Application Number:
JP22371896A
Publication Date:
November 12, 2001
Filing Date:
August 26, 1996
Export Citation:
Assignee:
Nippon Steel Tube Co., Ltd.
International Classes:
G01N29/44; G01N29/22; (IPC1-7): G01N29/22
Domestic Patent References:
| JP7167844A | ||||
| JP2291843A |
Attorney, Agent or Firm:
Toshiaki Hosoe