Abstract: In the field of monitoring the aging of parts subjected to a rotary movement and, more precisely, of monitoring the deformation to which a peripheral surface of a rotating part is possibly subject, an improved method is provided. The method includes: a step of emitting a light signal at a first end of an optical fiber at least one section of which runs between two points of the surface of the part; a step of measuring a characteristic of the light signal received at a second end of the optical fiber, the characteristic varying as a function of the length of the optical fiber between its ends; and a step of comparing the characteristic of the light signal to a reference signal.

Abstract: A monitoring device is provided that is used for the monitoring of an area of building or land, including an optical strand used as a sensor, one optical source for emitting an optical emission signal transmitted in the optical strand, and one optical analogue detector for detecting an intensity of an optical return signal corresponding to the optical emission signal returning from the optical strand. The monitoring device is arranged as a compact unit and includes a controller for alternately activating and deactivating the emission of the optical source so that a ratio between the non-emission duration and the emission duration is greater than 5000. A monitoring system is also provided including such a monitoring device, and a monitoring method carried out in the monitoring device.

Abstract: In the field of monitoring the aging of parts subjected to a rotary movement and, more precisely, of monitoring the deformation to which a peripheral surface of a rotating part is possibly subject, an improved method is provided. The method includes: a step of emitting a light signal at a first end of an optical fibre at least one section of which runs between two points of the surface of the part; a step of measuring a characteristic of the light signal received at a second end of the optical fibre, the characteristic varying as a function of the length of the optical fibre between its ends; and a step of comparing the characteristic of the light signal to a reference signal.