Deformation Detecting Device and Diagnosis System

A diagnosis system, comprising:

• one or a plurality of deformation detecting devices attached to a measurement target;
• and
• a central management device including a storage device which stores data at the time of normal operation in the measurement target, and a processing section which determines a state of the measurement target based on a comparison result between detection data input from one or a plurality of the deformation detecting devices and data at the normal operation,
• wherein the deformation detecting device includes
• a film-like elastic body which has a first surface to be adhered to a measurement target and a second surface opposite to the first surface, and in which the second surface has at least one set of a recess portion and a projection portion in a first direction in a static state, a first electrode formed in a region of the recess portion of the second surface,
• a second electrode formed in a region of the projection portion of the second surface,
• a film-like piezoelectric body which has a uniform thickness and has a third surface disposed along the second surface of the elastic body and a fourth surface opposite to the third surface, and of which a shear modulus of elasticity is higher than that of the elastic body,
• a third electrode formed in a region of the fourth surface opposite to the first electrode,
• a fourth electrode formed in a region of the fourth surface opposite to the second electrode, and
• a circuit which takes out information regarding both or one of a first signal generated between the first electrode and the fourth electrode and a second signal generated between the second electrode and the third electrode, as detection data.