Acoustic Sensing (DAS)
Distributed Acoustic Sensing is a technology that senses vibrations through the standard fiber optic cables. It only uses one fiber optic cable on the field to interrogate the perimeter. Systems can work continuously in very long distances. DAS systems use the Rayleigh Back-scattering phenomenon by sending laser signals into the fiber optic cable. Back-scattered light signals are affected by acoustic (vibrational) waves created by any contact or movement near the cable. Affected light signals processed by Processor Unit with an Artificial Intelligence Algorithms. After the interrogation, alarms are displayed in the web interface.
What is Distributed Acoustic Sensing?
Acoustic Sensing (DAS) is a technology that utilizes optical fibers to detect acoustic signals and vibrations along the entire length of the fiber. DAS is based on the principle of Brillouin scattering, which occurs when light waves interact with sound waves in a fiber optic cable.
In a DAS system, a continuous wave of light is sent into the fiber optic cable. As the light travels along the fiber, it interacts with the acoustic signals and vibrations in the surrounding environment. This interaction causes a small shift in the wavelength of the light, which can be detected and analyzed by the system.
By analyzing the wavelength shift in the light, DAS can detect and locate a wide range of acoustic signals and vibrations, including seismic activity, pipeline leaks, traffic movement, and even human footsteps. The technology offers several advantages over traditional sensing systems, including the ability to monitor large areas with a single fiber optic cable, high sensitivity, and the ability to detect signals in real-time.
DAS has applications in a variety of industries, including oil and gas, security, and transportation. In the oil and gas industry, DAS is used for pipeline monitoring, reservoir surveillance, and seismic exploration. In the security industry, DAS can be used for perimeter detection, intrusion detection, and crowd monitoring. In the transportation industry, DAS can be used for traffic monitoring, railway track monitoring, and structural health monitoring. Overall Distribured Acoustic Sensing System (DAS) is a powerful and versatile sensing technology that has the potential to revolutionize the way we monitor and measure acoustic signals and vibrations in various industries.
Usage Areas
- Seismic sensing
- Border security
- Perimeter security
- Pipeline security
- Industrial safety
- Plants safety
Benefits
- High Sensitivity
- High Immunity
- High Flexibility
Perimeter Security
Fiber optic acoustic sensing applications include natural disasters, human activities, intrusion detection, and seismic effects. Perimeter security is the most common usage. Perimeter Intrusion Detection System (PIDS) is a terminology that expresses Perimeter Security. The system detects intrusion hence the one could use it for any measures. One of the most used ways is security reasons.
Perimeter Intrusion detection is one of the main detection for DAS systems. Many high-security facilities use the DAS system for intrusion detection. The system has many advantages and features like; adjustable sensitivity, Geographic Information System adaptation, high durability and 24/7 intrusion detection. Hence facilities that need high protection measures rely on Distributed Acoustic Sensings.
Detection Examples
- Walking
- Digging
- Climbing
- Vehicle Activity
Pipeline Security & Monitoring
Intrusion Detection System is a long-range Pipeline Monitoring Solution that uses single-mode fiber optic cables as a detecting. The system is able to use fiber optic cables for intrusion detection. This is one of the reasons that pipelines are suitable for DAS systems. Another reason that makes the system convenient is the system's Intrusion Detection range.
While an unintentional accident can occur, also sabotages are on the list. Hence companies should secure their products. But pipelines are very vulnerable to these kinds of actions due to a lack of security. These security deficiencies are caused because of very long distances. They cannot be protected by any conventional measures. So DAS systems are convenient because of these kinds of problems.
Detection Examples
- Digging
- Excavation
- Pipe Raptures
- Activities Around Pipeline
