By Songling Huang, Shen Wang
This ebook introduces novel advancements within the box of electromagnetic non-destructive checking out and overview (NDT/E). the themes comprise electromagnetic ultrasonic guided wave trying out, pulsed eddy present checking out, distant box eddy present trying out, low frequency eddy present trying out, steel magnetic reminiscence checking out, and magnetic flux leakage trying out. contemplating the expanding situation in regards to the safeguard upkeep of severe buildings 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 booklet covers either theoretical researches and the engineering purposes of the electromagnetic NDT expertise. it can function a important reference for students and suitable NDT technicians. it's also an invaluable fabric for qualification education and better studying for nondestructive trying out professionals.
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42 mm, that is, half the wavelength of the T(0,1) mode, the T(0,1) guided wave mode can be excited. The premagnetized nickel strap can be fixed on the pipeline surface using either epoxy resin glue or a mechanical clamping ring, and the coil can be made of the enameled wire or the flexible printed circuit board. 42 22 1 The Electromagnetic Ultrasonic Guided Wave Testing Rectifier and filter circuit PC/Hand knob Control circuit Drive circuit inverter circuit Transmitting EMAT Over current protection circuit Fig.
In the pulsed eddy current testing, another advantage of the wideband signal is better noise suppression. Based on the principle of the multifrequency eddy current, response of each frequency can cancel out an interferencing factor. In the response of the pulsed eddy current testing, more frequency components are included, so noises from different sources can be suppressed. The pulsed eddy current testing also has other advantages. The operation is simple, the testing speed is high, the structure is simple [3], and the excitation signal is stable and so on.
24. It is mainly composed of the electromagnetic ultrasonic excitation source, the transmitting EMAT, the receiving EMAT, the filtering amplifier, the computer, direct current source, and the experimental pipeline. In the experiment, the high-power pulse excitation signal is generated by the electromagnetic ultrasonic excitation source and output to the excitation EMAT. The excitation EMAT is based on the magnetostrictive effect, and the ultrasonic guided wave propagating along the axial direction of the pipeline is generated in the pipe wall.
