Device For Characterizing A Physical Phenomenon By Ablation Of An Optical Fiber With Bragg Gratings

摘要

A device for characterizing a physical phenomenon that includes at least one optical fibre with short Bragg gratings having constant spacing, at least one broad spectrum laser lighting source, an optical circulator and a photoelectric detector that is configured to measure a global flux of all the reflected radiation picked up at the output of the optical circulator, as a function of time. Further disclosed is a method of characterization in which the global flux of the signal is measured in such a way that a drop in the signal corresponds to the destruction of a Bragg grating.

主权项

1. A device for characterizing a physical phenomenon comprising:
at least one optical fiber with Bragg gratings, for disposal transversely to a propagation front of a physical phenomenon and comprising a plurality of Bragg gratings between a first end and a second end, each Bragg grating configured to reflect a narrow band of specific wavelengths associated with the Bragg grating at least one broad-spectrum laser illumination source, configured to emit laser radiation containing wavelengths associated with the Bragg gratings, an optical circulator configured to transmit the laser radiation from the at least one laser source to the first end of the optical fiber and to capture reflected radiation sent back by the Bragg gratings of the optical fiber with Bragg gratings by the first end, wherein each Bragg grating of the at least one optical fiber is short and of constant period with a period that is specific to each Bragg grating, and in wherein the device further comprises a photoelectric detector configured to measure a total flux of all the reflected radiation captured by the photoelectric detector as output from the optical circulator and as a function of time.