Bimorph
A bimorph is a cantilever used for actuation or sensing which consists of two active layers.
In actuator applications, one active layer contracts and the other expands if voltage is applied, thus the bimorph bends.
In sensing applications, bending the bimorph produces voltage which can for example be used to measure displacement or acceleration.
The first theory about the bending of thermally activated bimorphs was given by Stoney.
[2] Newer developments also enabled electrostatically activated bimorphs for the use in microelectromechanical systems.
1 - substrate
2 - piezoelectric layer
3 - passive layer
4 - mechanical contact area
5 - track