By Songling Huang, Shen Wang
This e-book introduces novel advancements within the box of electromagnetic non-destructive checking out and assessment (NDT/E). the subjects contain electromagnetic ultrasonic guided wave trying out, pulsed eddy present trying out, distant box eddy present checking out, low frequency eddy present checking out, steel magnetic reminiscence trying out, and magnetic flux leakage trying out. contemplating the expanding obstacle concerning the protection upkeep of severe constructions in a variety of industries and daily life, those themes provided right here might be of specific curiosity to the readers within the NDT/E box. This publication covers either theoretical researches and the engineering functions of the electromagnetic NDT expertise. it might probably function a important reference for students and correct NDT technicians. it's also an invaluable fabric for qualification education and better studying for nondestructive checking out professionals.
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Extra info for New Technologies in Electromagnetic Non-destructive Testing
Due to the jumps of the excitation pulse at the rising and falling edges, eddy currents will be induced in the specimen. Compared to the conventional eddy current testing using single frequency sinusoidal excitation, frequency spectrum of the excitation signal of the pulsed eddy current testing has richer contents, and with it, the response will contain multiple frequency components. In view of the relationship between the eddy current penetration depth and the frequency of excitation source, from one single pulse excitation, all the defect information within a certain depth is obtained.
The processing includes band-pass ﬁltering, averaging of multiple acquisitions, and envelope calculation. 5 The Electromagnetic Ultrasonic Guided Wave Testing Technique 25 Fig. 25 The main interface of the EMAT data acquisition and analysis software The ultrasonic guided wave has multimode characteristics. Multiple modes can exist at a certain frequency point. It is the basic precondition of pipeline testing to verify the correctness of the guided wave mode excitation. In practice, comparison of the measured wave velocity and the theoretical wave velocity is usually used to verify the excited guided wave mode is the desired mode.
Based on this design, when the particle vibration caused by a cluster propagates to the distance of λ/2 (the position of the adjacent cluster) with a phase velocity of cp, it will produce constructive interference with the particle vibration in the same direction caused by the adjacent cluster, which will enhance the vibration intensity. 8), and the particle vibrations caused by the adjacent clusters cannot generate the constructive interference and may even cancel out each other. Thus, if multiple cluster coil is used, the vibration intensity of the desired guided wave mode can be improved, and the generation of other guided wave modes can be restrained.