Amphibious capacitive flexible sensing unit and system for measuring muscle deformation

The invention belongs to the related technical field of flexible sensors, and discloses an amphibious capacitive flexible sensing unit and system for muscle deformation measurement. The flexible sensing unit comprises a shell, an acquisition circuit and an upper-layer electrode which are arranged in the shell as well as an elastic body and a lower-layer electrode which are arranged outside the shell, the elastic body is arranged between the upper-layer electrode and the lower-layer electrode, and when the flexible sensing unit is attached to the surface of an object to be measured, the elastic body deforms to change the capacitance between the upper-layer electrode and the lower-layer electrode; the acquisition circuit is arranged above the upper-layer electrode and is used for acquiring a change signal of capacitance between the upper-layer electrode and the lower-layer electrode; and when the to-be-detected object deforms, the shell provides boundary pressure for the elastic body, so that the elastic body d