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Why does piezoelectric need amplifying?
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[QUOTE="haruspex, post: 6010878, member: 334404"] Yes, but in what you wrote you confused the two directions of the effect. When a voltage is applied, it causes the crystal to expand or to contract. This is the effect the device uses to create the ultrasound. Conversely, when the crystal is stretched or compressed it generates a voltage. This is the effect used to detect the reflected ultrasound. Because the voltage generated by the reflection is much smaller than the one used to drive the vibration, some clever electronics disables the detection circuit during the driving phase. Note also that if applying a positive voltage to one side causes contraction then compressing the material will cause a negative voltage on that side. This 'reversal' is common to many reactive processes. E.g. in electromagnetism. [/QUOTE]
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Why does piezoelectric need amplifying?
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