Community Research and Development Information Service - CORDIS

Fibre bragg grating industrial logging unit

A logging unit was designed for signal acquisition and recording for Fibre Bragg Gratings (FBG) sensors.

Two different types of Elementary Detection Modules (EDM) have been developed and show good performances:

-Wavelength tracking based on sensor-receiver grating pairs: the receiver grating is bonded onto a piezoelectric actuator and is used as a tuneable filter. The spectra of both gratings are kept superimposed using a tracking circuit.

-Scanning Fabry-Perot Interferometer (FPI).

The logging unit integrates an optical board with 4 receiver FBGs mini-piezo, couplers, optical source and power electronics. The CEA-LETI Logging Unit is integrated into a rugged portable PC, incorporates a FPI-based EDM in a modular and flexible design (source-FPI-switch-board) , and has a large multiplexing capacity (8 fibres x 4 to 8 sensors/fibre). It includes a user-friendly data acquisition and display software based on the Lab-View environment.

Reported by

SOLETANCHE-BACHY
6 rue Watford
F- 92000 Nanterre
France
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