- Budget: ~RMB 00,000
- Products: Vibration Optical Fiber
- Construction: Local Integrator
As an important energy hub in central China, Hubei Province has accelerated the construction of liquefied natural gas (LNG) receiving stations and peak-shaving storage facilities in recent years. However, LNG stations impose extremely high requirements on perimeter security protection due to the flammable and explosive nature of the stored medium. Traditional infrared beam detectors and electronic fences are prone to false and missed alarms in bad weather or complex terrain, making it difficult to meet round-the-clock, high-precision security needs. In this context, vibration optical fiber sensing technology, with its passive detection, electromagnetic interference immunity and concealed deployment, has gradually become the preferred solution for perimeter alarm systems at LNG stations in Hubei. Taking an actual LNG peak-shaving station in Hubei as an example, this article analyzes the construction process and operating results of the vibration optical fiber alarm system.
The LNG station is located along the Yangtze River, covering about 200 mu (about 13 hectares) with a perimeter of over 1.5 kilometers. Its surroundings include farmland, roads and some construction areas, creating a complex interference environment. In the initial phase, the security team tried a combination of leaky cable and video surveillance, but wet-season false alarms caused by soil moisture occurred repeatedly, and the system could not effectively distinguish intrusion from disturbance when large machinery such as excavators approached. After technical evaluation across multiple options, a distributed vibration optical fiber system based on the dual Mach-Zehnder interferometry principle was adopted. Using the station's existing fence as the deployment carrier, the sensing cable was laid in an “S” shape along the bottom and middle of the fence, preserving the original structure while achieving dead-angle-free sensing coverage.
During construction and commissioning, the project team made several optimizations for Hubei's specific climate and geological conditions. Because the station is near the river with a high groundwater level, all cable splice enclosures use IP68-grade sealing with anti-condensation treatment; the backend system also provides multi-level sensitivity thresholds, filtering periodic vibration signals such as wind, rain and vehicle passage through algorithms. Short pulses caused by small animals like hares and birds touching the fence are marked as “invalid events” by machine learning models, while climbing, knocking and cutting behaviors are precisely identified and trigger alarms. During commissioning, the team simulated more than ten intrusion scenarios, including fence climbing, drilling and tool prying; the alarm accuracy exceeded 98%, with positioning error controlled within ±3 meters.
Since official operation, the system has run stably for over one year and issued a total of 7 valid intrusion alarms, all handled promptly by security staff. On one occasion at 2 am, the system detected regular knocking signals lasting about 15 seconds at the northwest corner of the fence and immediately pushed an alarm to the central room while automatically steering a nearby high-definition PTZ camera toward the target area. The duty officer confirmed via video that two suspicious individuals were attempting to cut the fence with a hacksaw, and patrols were dispatched to the scene, successfully preventing a potential sabotage event. In addition, the system supports event playback, correlating vibration waveforms, timestamps and video captures for archived evidence, providing strong support for subsequent security audits. The operator reported that compared with previous years, the perimeter false alarm rate fell by about 80%, greatly reducing the workload of duty staff.
As this Hubei case shows, vibration optical fiber alarm systems have significant application value at high-risk industrial sites such as LNG stations. They not only overcome the adaptability shortcomings of traditional perimeter equipment in complex natural environments, but also improve intrusion discrimination accuracy through intelligent signal processing. With the growing maturity of domestic fiber sensing technology, construction costs are gradually declining and maintenance is becoming simpler. In the future, this technology is expected to integrate with thermal imaging, radar and other multi-sensing means to build a more comprehensive security system, providing solid protection for the safe operation of energy infrastructure in Hubei and beyond.
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