Q1/the angle of spread in aluminium for a beam of frequency 5 MHz generated by a crystal of 20 mm diameter is 8°, but the angle is reduced to 5.3° for a 15 mm diameter crystal vibrating at 10 MHz. If the ultrasonic frequency is decreased so the wavelength approaches the dimensions of the crystal disc, is there beam propagation?
Q1/the angle of spread in aluminium for a beam of frequency 5 MHz generated by a crystal of 20 mm diameter is 8°, but the angle is reduced to 5.3° for a 15 mm diameter crystal vibrating at 10 MHz. If the ultrasonic frequency is decreased so the wavelength approaches the dimensions of the crystal disc, is there beam propagation?
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Transcribed Image Text:Q1/the angle of spread in aluminium for a beam of frequency 5 MHz generated by a crystal
of 20 mm diameter is 8°, but the angle is reduced to 5.3° for a 15 mm diameter crystal
vibrating at 10 MHz. If the ultrasonic frequency is decreased so the wavelength approaches
the dimensions of the crystal disc, is there beam propagation?
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