Frequency Separation of Signals and Interferences in Noise-Immune Ultrasonic Testing of Articles Manufactured from Complexly Structured Materials

被引：2
作者：
Kachanov, V. K. [1 ]
Sokolov, I. V. [1 ]
Rodin, A. B. [1 ]
机构：
[1] Tech Univ, Moscow Power Engn Inst, Moscow 111250, Russia
来源：
RUSSIAN JOURNAL OF NONDESTRUCTIVE TESTING | 2008年 / 44卷 / 11期
关键词：
Nondestructive Test; Ultrasonic Signal; Frequency Separation; Structural Noise; Echo Signal;
D O I：
10.1134/S1061830908110028
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Methods for extracting ultrasonic echo signals from interferences (electroacoustic interference and structural noise) correlated with a probing signal are studied in detail. These methods are based on the frequency separation of the spectra of the informative signal and noise. Frequency-separation methods involving lock-in signal detection are considered. Various aspects of using a lock-in detector in flaw detection and tomography of complexly structured articles are analyzed. Examples of applying the frequency decorrelation of signals in ultrasonic testing of large old cast bronze bells of the Ivan the Great Bell Tower in the Moscow Kremlin and large bells of the Cathedral of Christ the Savior in Moscow are considered.
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页码：747 / 761
页数：15
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