Passive sensor for detecting exceedance of critical temperature threshold in turbojet engine of airplane, has sensitive element deformed when subjected to temperature higher than threshold corresponding to transition temperature of material

摘要

The sensor (14) has a sensitive element formed of a cylinder (16) that is made of shape memory material, and housed in a cylindrical guiding sheath (24). The sensitive element is deformed in an irreversible manner by a simple shape memory effect, when the sensitive element is subjected to a temperature higher than a predetermined threshold corresponding to a transition temperature of the shape memory material. The sheath is closed at its end by a membrane (26) arranged opposite to an end (22) of the cylinder. An independent claim is also included for a turbomachine part comprising a passive sensor.