Optical fiber sensor and change detection method
AssigneeNEC Corporation
InventorsWataru Kohno, Tomoyuki Hino
Life of this patent
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Abstract
The optical fiber sensor includes a setting unit which sets a section to be evaluated set in the optical fiber to one of a first section and a plurality of second sections, each of which is shorter than the first section, an extraction unit which extracts a state change of light from the optical fiber, and a detection unit which detects a change in the surrounding environment based on time-series data of the state change of light in the section to be evaluated.
Claims9
An optical fiber sensor that detects a change in a surrounding environment of an optical fiber, comprising:
- a memory storing software instructions, and
- one or more processors configured to execute the software instructions to
- set a section to be evaluated set in the optical fiber to one of a first section and a plurality of second sections, each of which is shorter than the first section;
- extract a phase difference in a backscattered light from the optical fiber, and
- detect a change in the surrounding environment based on time-series data of the phase difference in the section to be evaluated,
- wherein the one or more processors are configured to execute the software instructions to switch the section to be evaluated between the first section and the second section when determining a time average of amplitude of time-series data of the phase difference in the section to be evaluated exceeds a predetermined value.
A change detection method for detecting a change in a surrounding environment of an optical fiber, comprising:
- setting a section to be evaluated set in the optical fiber to one of a first section and a plurality of second sections, each of which is shorter than the first section;
- extracting a phase difference in a backscattered light from the optical fiber, and
- detecting a change in the surrounding environment based on time-series data of the phase difference in the section to be evaluated,
- wherein the section to be evaluated is switched between the first section and the second section when determining that a time average of amplitude of time-series data of the phase difference in the section to be evaluated exceeds a predetermined value.
A non-transitory computer readable recording medium storing a change detection program, wherein
- the change detection program causes a computer to execute:
- setting a section to be evaluated set in the optical fiber to one of a first section and a plurality of second sections, each of which is shorter than the first section;
- extracting a phase difference in a backscattered light from the optical fiber, and
- detecting a change in the surrounding environment based on time-series data of the phase difference in the section to be evaluated,
- wherein the section to be evaluated is switched between the first section and the second section when determining that a time average of amplitude of time-series data of the phase difference in the section to be evaluated exceeds a predetermined value.
Dependencies are inferred from the claim text.