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An accelerometer is a device that measures proper acceleration; proper acceleration is not the same as coordinate acceleration (rate of change of velocity).
Vibration Terms and Definitions. Strength and Mechanics of Materials | Accelerometers. The following are vibration related terms and definitions. Acceleration. A vector quantity that specifies rate of change of velocity. Accelerometer. A sensor whose electrical output is proportional to acceleration. Charge amplifier. An amplifier whose output voltage is proportional to the output charge from a piezoelectric transducer.