Not only normal signal processing functions, such as filtering and spectrum analysisi are presented, but also the system is capable of reducing all kinds of noises encountered in ultrasonic nondestructive testing. In addition, wavelet and wavelet packet analysis are contained.
Not only normal signal processing functions, such as filtering and spectrum analysisi are presented, but also the system is capable of reducing all kinds of noises encountered in ultrasonic nondestructive testing. In addition, wavelet and wavelet packet analysis are contained.
Korolev, the oldest worker of the Central Research Institute for Heavy Machinery (TsNIITMASh), has told about some episodes on the initial stages of the ultrasonic NDT development.
Today, the TOFD procedure is used for operational inspections or quality control of structures during production instead of routine radiography and ultrasonic NDT procedures [1].
A novel method of time-frequency analysis, wavelet-packet atomic decomposition based on the matching-pursuit (MP) algorithm, is proposed for improvement of ultrasonic flaw detection during ultrasonic NDT.
This paper describes the structure design, technical point, performance measurement and effective application of ultrasonic transducers using PVDF organic piezoelectric film.
A pulse compression system in non-destructive testing, which consists of linear frequency modulated pulse signal and digital Matched filter using digital electric exciting signal, is presented. Ultrasonic pulse compression signal is obtained in various time bandwidth products systems. Experimental results are in fine agreement with the theory. The reduction of sidelobe of -41.9 dB and -41.5 dB can be achieved for Hamming and Gaussiau weighed signal. The performance of ultrasonic detecting system will be imp...
To raise the precision and reliability of ultrasonic testing, several multi-dimensional ultrasonic transducers, or two-dimensiollal transducers and three-dimensional transducers, are investigated. Analyses and trials are made for their applications in acoustic emission and ultrasonic stress measurement.