Optical fiber sensing system, optical fiber sensing device, and breakage detection method

An optical fiber sensing device comprising:

• at least one memory storing instructions, and
• at least one processor configured to execute the instructions to;
• transmit pulsed light to an optical fiber and receive an optical signal from the optical fiber;
• continuously or periodically detect a far end position of the optical fiber based on the optical signal received from the optical fiber;
• and
• determine that the optical fiber is broken in a case where a difference between the detected far end position and an initial value of the far end position exceeds a predetermined value.

A breakage detection method performed by an optical fiber sensing device, the breakage detection method comprising:

• a communication step of transmitting pulsed light to an optical fiber and receiving an optical signal from the optical fiber;
• a far end detection step of continuously or periodically detecting a far end position of the optical fiber based on the optical signal received from the optical fiber;
• and
• a breakage detection step of determining that the optical fiber is broken in a case where a difference between the far end position detected in the far end detection step and an initial value of the far end position exceeds a predetermined value.