Abrégé

The invention relates to the field of the securing of buildings. It relates to a system for monitoring deformations of a structure comprising a plurality of sensors. The monitoring system (40) according to the invention comprises: a set of measuring devices (41A, 41B, 41C) each able to measure deformations of an element (31, 32, 34) of the structure (30), and a processing module (21) able to analyse the measurements made by the various measurement devices (41A, 41B, 41C) during one and the same time period, in such a way as to determine, as a function of a possible correlation between the measurements, whether the deformations are due to an internal cause or to an external cause outside the structure.

Classes IPC  ?

• G01M 5/00 - Examen de l'élasticité des structures ou ouvrages, p.ex. fléchissement de ponts ou d'ailes d'avions

Abrégé

The invention relates to the field of monitoring the ageing 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. The method according to the invention comprises: a step (71) 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 (72) of measuring a characteristic of the light signal received at a second end of the optical fibre, said characteristic varying as a function of the length of the optical fibre between its ends; and a step (73) of comparing the characteristic of the light signal to a reference signal.

Classes IPC  ?

• G01M 13/04 - Roulements

Abrégé

The present invention relates to an optical measurement device which includes a reference channel (13b) arranged such as to detect a reference optical signal and a measurement channel (13a) arranged such as to detect a measurement optical signal, the reference channel (13b) and the measurement channel (13a) of which are formed in the same substrate (12). Thermostat means are thus no longer necessary for measurement and reference channels.

Classes IPC  ?

• G01M 5/00 - Examen de l'élasticité des structures ou ouvrages, p.ex. fléchissement de ponts ou d'ailes d'avions
• G01M 11/00 - Test des appareils optiques; Test des structures ou des ouvrages par des méthodes optiques, non prévu ailleurs

Abrégé

A monitoring device (1) used for the monitoring of an area of building or land comprising: -an optical strand used as a sensor; -one optical source (3) for emitting an optical emission signal (4) transmitted in the optical strand; -one optical analogue detector (5) for detecting an intensity of an optical return signal (6) corresponding to the optical emission signal (4) returning from the optical strand. The monitoring device (1) is arranged as a compact unit and comprises control means (7) for alternately activating and deactivating the emission of the optical source (3) so that a ratio between the non-emission duration and the emission duration is greater than 5000. The invention also concerns a monitoring system comprising such a monitoring device, and a monitoring method carried out in the monitoring device.

Classes IPC  ?

• G01M 11/08 - Test des propriétés mécaniques
• G01B 11/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer la déformation dans un solide, p.ex. indicateur optique de déformation