Accelerometer
Is a specific type of vibration transducer which converts mechanical vibration into electrical signals using a piezoelectric crystal. There are a number of different accelerometer designs each with their own characteristics, advantages and disadvantages.
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Amplitude
Is a measurement of the magnitude, intensity or size of vibration and may be measured in displacement, velocity or acceleration.
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Acceleration
Acceleration is the change of velocity over a period of time, Newtons second law stated that Force was the product of mass and acceleration or put another way Acceleration = Mass/Force.