Optical fiber sensing system, optical fiber sensing equipment, and underground action monitoring method

An optical fiber sensing equipment comprising:

• an acquisition unit configured to acquire an optical signal on which a vibration detected by an optical fiber is superimposed from the optical fiber for detecting the vibration in underground;
• an identifying unit configured to identify a suspicious action in the underground based on a vibration pattern included in the optical signal acquired by the acquisition unit;
• and
• a storage unit configured to store in advance a vibration pattern of the vibration generated when the suspicious action occurs in the underground as a first vibration pattern, wherein
• the identifying unit is configured to determine, when the vibration pattern included in the optical signal acquired by the acquisition unit matches the first vibration pattern, the suspicious action corresponding to the first vibration pattern has occurred in the underground.

An underground action monitoring method performed by an optical fiber sensing system, the underground action monitoring method comprising:

• detecting, by an optical fiber, a vibration in underground;
• acquiring, from the optical fiber, an optical signal on which the vibration detected by the optical fiber is superimposed;
• identifying a suspicious action in the underground based on a vibration pattern included in the optical signal acquired in the acquiring;
• and
• storing in advance a vibration pattern of the vibration generated when the suspicious action occurs in the underground as a first vibration pattern, wherein
• in the identifying, when the vibration pattern included in the optical signal acquired in the acquiring matches the first vibration pattern, it is determined that the suspicious action corresponding to the first vibration pattern has occurred in the underground.