The PZT material thickness is measured as what fraction of the sound wavelength?

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Sharpen your skills for the Davies Publishing SPI Test with targeted flashcards and multiple-choice questions, complete with hints and clarifications. Prepare thoroughly for success!

Multiple Choice

The PZT material thickness is measured as what fraction of the sound wavelength?

Explanation:
Thickness-mode transducers are designed so that a half-wavelength of the acoustic wave fits across the crystal’s thickness. If the wave in PZT has speed v and the drive frequency is f, the wavelength is lambda = v/f. When t equals lambda/2, the crystal rings in its fundamental thickness mode, giving f = v/(2t). Therefore, the PZT thickness is described as one-half of the sound wavelength. The quarter-wavelength idea you might hear is for the matching layer, not the PZT itself, which is why that option doesn’t describe the PZT thickness.

Thickness-mode transducers are designed so that a half-wavelength of the acoustic wave fits across the crystal’s thickness. If the wave in PZT has speed v and the drive frequency is f, the wavelength is lambda = v/f. When t equals lambda/2, the crystal rings in its fundamental thickness mode, giving f = v/(2t). Therefore, the PZT thickness is described as one-half of the sound wavelength. The quarter-wavelength idea you might hear is for the matching layer, not the PZT itself, which is why that option doesn’t describe the PZT thickness.

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