Distributed acoustic sensing for airport security

DAS for airport securityPerimeter security is considered to be a significant problem for airports all over the world. For example, Denver International Airport is one of the largest airports in the USA that includes 25 airlines. Its size requires constant security operations, and it is highly challenging because the larger an airport’s size is, the bigger its perimeter, the more difficult it becomes to save integrity and police borders.

The ways for airport border security include walls, barbed-wire fencing, CCTV, guardhouse, and manned patrols. Of course, the mentioned measures are effective, however, they are mostly passive barriers that are possible to cross. Thus, the use of modern technologies such as artificial intelligence and distributed acoustic sensing or DAS system allows improving the situation with the management and security of airports.

DAS technologies offer continuous monitoring of the whole perimeter and have alerts in real-time, provide security groups the complete overview that is required for operational management, and respond to threats effectively. Moreover, DAS systems have many benefits for airport operators, when it comes to the adoption of digital technologies, their integration into perimeter security strategies.

The principle of DAS operation is based on the use of fiber optic cables that are similar to an ecosystem of highly-sensitive, vibrational sensors that creates a smart barrier around the whole perimeter. Herewith, it is possible to install a distributed acoustic sensing system both in the ground and established into fencing.

Also, it should be noted that DAS is a highly reliable technology because it continues its operation even after it has been cut. DAS system has the following advantages for the airport area:

  • The ability to identify and locate such potentially threatening activities as walking people, excavation and tunneling processes, fence climbing, and cutting.
  • Distributed acoustic sensing allows collecting data on prolonged or historical events.
  • DAS technology highlights long term patterns and points of potential vulnerability.
  • DAS offers a clear differentiation between numerous threats that might occur at the edge of an airport, herein, the technology provides security teams special alarms that enable to make decisions quickly.

Finally, DAS monitoring is the ideal solution for airport security because there are the earliest alerts for security groups. Moreover, airport operators can combine distributed acoustic sensing with other traditional techniques.

Optromix is a DAS system manufacturer that provides top of the line distributed acoustic sensing systems suitable for monitoring of commerce networks. If you have any questions or would like to buy a DAS system, please contact us at info@optromix.com

New long-gauge FBG sensor allows detecting corrosion damage

FBG sensors for corrosion detectionNowadays the process of main steel reinforcement corrosion is one of the most frequent problems that evokes structural deterioration and reduces its durability. However, the development of a new kind of long-gauge fiber Bragg grating sensor enables us to detect and quantify corrosion damage via a two-level strategy.

The main advantage of the novel long-gauge FBG sensor compared with the conventional strain sensors is the possibility to use it for both local and global structural monitoring. The principle of FBG technology operation is based on the measurement of the averaged strain within a long gauge length.

It should be noted that the new FBG system is based on the dynamic macro strain responses of FBG sensors. The technology of the strain flexibility detects the location of the corrosion process, and then it quantifies the corrosion by analyzing the sensitivity of strain flexibility.

Moreover, the technology of fiber Bragg grating sensors provides the following benefit that lies in highly accurate and effective corrosion quantification that is possible to be performed in a reduced domain. Herewith, the FBG sensing system has shown great results while testing in the marine environment.

The FBG technology is highly effective in the detection of structural corrosion, but unfortunately, fails to determine the corrosion process unless the apparatus covers the corroded part. Nevertheless, the FBG-based strain sensor remains the most popular due to the use of small, lightweight optical fibers that allow being easily attached to the surface of any steel reinforcement.

The main difference between the new fiber Bragg grating sensors and traditional ones is that civil structures with a large scale and complex shapes very often contain a high quantity of unknown factors that make the process of analysis slower and more complicated. Also, compared to long-gauge FBG sensors, most damage detection techniques are able to detect damage, but can not quantify the severity.

Thus, the distributed long-gauge fiber Bragg grating sensor is a very promising technology for the efficient and precise location of the corrosion damage and further structural long-term performance estimation. Herein, researchers have developed a step-by-step strategy that would help to detect and quantify the process of corrosion, and even proved it by a solid theoretical basis.

Finally, the novel two-level corrosion detection by the FBG sensing system provides a decisive superiority because the corrosion detection significantly reduces the number of unknown factors in the sensitivity equations and increases the success of the corrosion quantification.

Optromix is a fast-growing vendor of fiber Bragg grating (FBG) products line such as fiber Bragg grating sensors, FBG interrogators and multiplexers, Distributed Acoustic Sensing (DAS) systems, Distributed Temperature Sensing (DTS)systems. The company creates and supplies a broad variety of fiber optic solutions for monitoring worldwide. If you are interested in FBG sensors and want to learn more, please contact us at info@optromix.com

DTS system controls oil rim movement

DTS for oil rim detectionToday operators in highly fractured carbonate reservoirs use running wireline gradiometric surveys as a traditional way of oil-rim movement monitoring. Nevertheless, the method is not ideal because it does not allow providing the necessary information in a manner timely enough to influence operations since the surveys are conducted just a few times a year. Distributed temperature sensing (DTS) system is an alternative solution that overcomes these drawbacks.

Distributed temperature sensing offers real-time monitoring of the oil rim in carbonate reservoirs. DTS technology is based on the use of optical-fiber Bragg gratings (FBGs) and is able to measure pressure in extreme environmental conditions. It should be noted that the DTS system does not require electronics, herewith it provides long service term even at elevated downhole temperatures. Also, distributed temperature sensing is quite stable, it can determine even small pressure changes.

Moreover, dozens of distributed temperature sensors can be implemented on one fiber optic cable connected to the FBG interrogator. The principle of operation includes a diaphragm pressure transducer that converts changes in the hydrostatic pressure of its environment into the deformation of a pressure-sensitive diaphragm, and then into the strain, within an optical fiber attached to the diaphragm. The thing is that optical fibers offer numerous advantages for oil and gas industry application, containing the following:

  • high transmission efficiency that means the FBG interrogator can be installed several kilometers away from the downhole sensors;
  • high data quality and accuracy due to data encoding in the light wavelength;
  • data immunity to the electromagnetic influence by machines;

At present time the information about pressure and temperature measurements, as well as system-health and self-diagnostic information are transmitted from the FBG interrogator into a database at 3-hour intervals. If fresh data sets are obtained, an algorithm processes them into gas/oil-contact and oil/water-contact locations. Also, it is possible to visualize pressure, temperature, and fluid-level data to see them in real-time.

Further improvement of the DTS system will allow the application of the system for the production monitoring in ultrahigh-temperature thermal-recovery wells, where fluid temperatures up to 280 °C can be reached. Finally, distributed temperature sensing provides the reduction of a production delay, the reduction of operational costs, health, safety, and environmental risk reduction, and the possibility of system expansion.

Optromix is a fast-growing vendor of fiber Bragg grating (FBG) product line such as fiber Bragg grating sensors, FBG interrogators and multiplexers, Distributed Acoustic Sensing (DAS) systems, Distributed Temperature Sensing (DTS) systems. The company creates and supplies a broad variety of fiber optic solutions for monitoring worldwide. If you are interested in temperature measurement systems and want to learn more, please contact us at info@optromix.com