Electromagnetic Ultrasonic Guided Waves by Songling Huang Shen Wang Weibin Li & Qing Wang

Author:Songling Huang, Shen Wang, Weibin Li & Qing Wang
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

Parameter name

Value

Height

5 mm

Width

6.7 mm

Number of turns

40

Electrical conductivity

5.7 × e7 S/m

Table 3.5The dimension and parameters of the thin nickel plate

Parameter name

Value

Length

300 mm

Width

55 mm

Thickness

0.3 mm

Electrical conductivity

1.43 × e7 S/m

Elasticity modulus

206.9 GPa

Poisson’s ratio

0.31

For the T-mode axial guided wave in the pipe, we make a premagnetization of the nickel strap along the circumferential direction of the pipe. The residual magnetic flux density of the nickel strap itself is used to provide the static bias magnetic field for the electromagnetic ultrasonic transducer. The reversible permeability when the nickel strap is generating the ultrasonic guided waves under the effect of residual magnetism is assumed to be 1.5833 × e−4 H/m.

The calculated waveform of the tone burst current excitation signal whose frequency is 200 kHz with 4 cycles is shown in Fig. 3.30.

Fig. 3.30The waveform of the excitation current

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