Calibrating a distributed fibre optic sensing system
AssigneeAiQ Dienstleistungen UG (haftungsbeschränkt)
InventorsWissem Sfar Zaoui, Clemens Pohl
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Abstract
A system and method for dynamically calibrating a distributed fiber optic sensing system is disclosed. The calibration system includes a light source for generating pulses of coherent light, an optical fiber arranged at least partly in a ground soil region to guide the light and a photo detector for detecting scattered light returning from the optical fiber in dependence of time. The method includes obtaining information from which a temporal change of an acoustic transfer characteristic of the ground soil region is derivable and calibrating a distributed acoustic sensing system based on the changed acoustic transfer characteristic.
Claims19
A method for dynamically calibrating a distributed fibre optic sensing system comprising a light source for generating pulses of coherent light, an optical fibre arranged at least partly in a ground soil region to guide the light, and a photo detector for detecting scattered light returning from the optical fibre in dependence of time, the method comprising:
- obtaining information from which a temporal change of an acoustic transfer characteristic of the ground soil region is derivable;
- and
- calibrating the distributed fibre optic system based on the changed acoustic transfer characteristic,
- wherein obtaining the information comprises:
- obtaining influence information about an influence factor effecting the temporal change of the acoustic transfer characteristic;
- and
- estimating a changed acoustic transfer characteristic based on the influence information.
A distributed fibre optic sensing system, comprising:
- a light source for generating pulses of coherent light;
- an optical fibre arranged at least partly in a region of ground soil to guide the light;
- a photo detector for detecting scattered light returning from the optical fibre in dependence of time;
- an information receiver configured to obtain information from which a temporal change of an acoustic transfer characteristic of the ground soil region is derivable,
- wherein obtaining the information comprises:
- obtaining influence information about an influence factor effecting the temporal change of the acoustic transfer characteristic;
- and
- estimating a changed acoustic transfer characteristic based on the influence information;
- the distributed fibre optic sensing system further comprising:
- a calibrator configured to calibrate the distributed fibre optic sensing system based on the changed acoustic transfer characteristic.
Dependencies are inferred from the claim text.