Precision return actuator

An actuator comprising:

• a base,
• an intermediate structure,
• an output interface, and
• two linear elements producing a controllable extension in the same longitudinal direction, each between a first and a second end, a first of the two elements having a first end fixed onto the intermediate structure and a second end fixed onto the base, a second of the two elements having a first end fixed onto the intermediate structure and a second end fixed to the output interface,
• wherein the base and the intermediate structure are positioned in such a manner that the controllable extension of the second element produces a displacement of the output interface in a first direction and the controllable extension of the first element produces a displacement of the output interface in a second direction, opposite to the first direction, with respect to the base, and
• wherein the actuator comprises deformation gauges mounted on the elements, wherein the gauges are connected so as to amplify the effect with a view to a measurement of the extension between the base and the output interface;
• and
• wherein the base, the intermediate structure, the output interface and the two elements form several components forming a stack and wherein it comprises a thermal regulation insert positioned between two components of the stack.