Method of and system for representing shape of an optical fiber sensor

A system for representing a shape of an optical fiber sensor having cores comprising of a central core and a plurality of outer cores, each core comprising one or more sensing elements, comprising:

• an interrogation processor configured to interrogate the cores of the optical fiber sensor via an incident optical wave having a wavelength range;
• a processor configured to process interferometric signals received from the interrogating of the cores;
• a reconstruction processor configured to:
• calculate an out-of-range curvature of at least one out-of-range section along the fiber sensor, wherein the out-of-range curvature has a radius of curvature lower than a minimum radius of curvature measurable within the wavelength range;
• and
• reconstruct the shape of the fiber sensor based on at least the processed interferometric signals and the out-of-range curvature.

A non-transitory computer-readable storage medium having stored a computer program comprising instructions for representing a shape of an optical fiber sensor having cores comprising of a central core and a plurality of outer cores, each core comprising one or more sensing elements, which, when executed by the processor, cause the processor to:

• interrogate the cores of the optical fiber sensor via an incident optical wave having a wavelength range;
• process interferometric signals received from the interrogating of the cores;
• calculate an out-of-range curvature of at least one out-of-range section along the fiber sensor, wherein the out-of-range curvature has a radius of curvature lower than a minimum radius of curvature measurable within the wavelength range;
• and
• reconstruct the shape of the fiber sensor based on at least the processed interferometric signals and the out-of-range curvature.