==The first one is the dependence of the material properties on .
So the sensor is realized, exploiting some effect, which changes one properties, one electrical properties due to the effect of a variation of ==.
==The other operation mechanism of sensor is the dependence of the geometry of the sensor on , so let’s think about a resistance, we have said that by stretching the conductor, so changing his length and his cross area, we have a variation of resistance. So this can be a working principle for sensors==.
==Finally, as a separate kind of working principle, we can exploit electromagnetic coupling of the sensor we want with the environment, with ==.
We will see 3 different accelerometer each with a different kind of operational principle:
- Using the material properties: “Charge Accelerometer” (Piezoelectric).
- Using the dependency on the geometry: “Capacitive Accelerometer”.
- Using the electromagnetic coupling: “Magnetic Accelerometer”.