Selective generation of ultrasonic Lamb waves by electromagnetic acoustic transducers

Li Ming-Liang, Deng Ming-Xi^†,, Gao Guang-Jian

Ultrasonic signals at f = 0.87 MHz: (a) time–domain signal at Δz = 280 mm, (b) STFT spectrogram, (c) slice of STFT spectrogram at f = 0.87 MHz.