A piezoelectric accelerometer works by sending an electrical signal from the sensor when it experiences a sudden acceleration. The construction of a piezoelectric accelerometer involves a sensing crystal to which a seismic weight is attached. When the sensor experiences acceleration, the weight exerts a force on the crystal. The piezoelectric crystal converts the force acting upon it to electrical signals, which can be measured to find the acceleration. Piezoelectric accelerometers are highly effective at measuring shocks and vibrations.
Piezoresistance or Piezoresistive accelerometers work by varying their resistance based on the acceleration they experience. The change in acceleration can be measured to understand the rate of acceleration experienced by the sensor. Piezoresistive accelerometers are less sensitive than piezoelectric accelerometers, as they are not best at measuring low-frequency impacts. However, they work best at high amplitudes and find their application vehicle crash testing and weapons testing.Capacitive Accelerometer: Capacitive sensors work by changing their capacitance based on the acceleration they experience. Their construction involves two capacitive plates and a diaphragm. As the sensor experiences acceleration, the diaphragm moves, changing the distance between the capacitive plates. This results in the capacitance of the sensor to change, and this change in capacitance can be measured and translated to the rate of acceleration on the sensor. You will find Capacitive MEMS (micro-electromechanical system) accelerometers used in most smartphones today.
What is a Triaxial Accelerometer?
A triaxial accelerometer can measure acceleration in three orthogonal directions (or the three perpendicular planes – X, Y, and Z). This feature enables triaxial accelerometers to measure all the vibration components affecting the object.A triaxial accelerometer houses three sensing elements, oriented perpendicular to each other. They find their use in measuring building vibrations, turbines, and high-speed machinery.