Discussion
What is the basic principle behind sensor used in vibration measurements ?
Answer: C
Vibration sensors work on the piezoelectric effect.
Most vibration sensors are piezoelectric accelerometers. A piezoelectric crystal or ceramic, such as quartz or lead zirconate titanate, produces an electric charge proportional to the force on it, so as the sensor vibrates the mass inside squeezes the crystal and the output voltage follows the acceleration.
Magnetic induction is used in some velocity pickups but is not the standard principle. The photoelectric effect is the basis of light sensors and the thermoelectric effect of thermocouples.
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