Comprehensive coverage

Technion researchers have developed a way to locate tunnels using an optical fiber

"The digging of tunnels is accompanied by the release of efforts that cause displacements, even if small, in the soil. By measuring the spatial changes of the movements with sensitive equipment, the location of the tunnel can be located." The researchers will present their research at an international conference to be held in April 2009 in Florida-USA

Digging the trench creates small detectable seismic waves
Digging the trench creates small detectable seismic waves

Technion researchers from the Faculty of Civil and Environmental Engineering have developed a way to locate tunnels using optical fibers. They will present their research at an international conference that will be held in April in Florida, USA.

"Smuggling tunnels allow the uncontrolled movement of people, drugs and weapons, and are a threat to the security of the country. Technological innovations in the field of optical fiber measurement allow the development of smart underground security fences, which are able to identify and locate the digging of tunnels", say the researchers, Dr. Assaf Keller and Dr. Raphael Lineker. "The digging of tunnels is accompanied by the release of efforts that cause displacements, even if small, in the soil. By measuring displacements (which are the spatial changes of displacements), with sensitive equipment, the location of the tunnel can be located."

Their research establishes the initial steps for the development of an underground fence based on BOTDR (Brillouin optical time domain reflectometry) technology for measuring transmissions along optical fibers.

According to Technion researchers, the BOTDR technology is ideal for this purpose, since 30 kilometers of border can be examined simultaneously by one device, and the fiber used for measurement is a conventional communication fiber that costs a few shekels per meter length.

System operation diagram. Courtesy of the Technion
System operation diagram. Courtesy of the Technion

As part of the research, the findings of which will be presented at the Defense, Security and Sensing Conference of the International Society for Light-Based Research SPIE - Defense, Security and Sensing, two options for locating tunnels were examined. One is based on burying a horizontal optical fiber at a shallow depth (see figure), and the other on burying the fiber in small-diameter vertical piles. The research involves aspects of soil mechanics, and considers the interaction between the fiber and the soil and the underlying structure.

The detection system is based on the decomposition of the signal into wavelets and their characterization by a neural network. The neural network was trained to locate tunnels by computer simulations of tens of thousands of cases, which also include disturbances unrelated to the tunnel (such as rainfall, and surface loads, which were measured and characterized in underground tunnels at the Technion). The digging of the tunnel has a very clear spatial character and is different from other disturbances. The ability of the BOTDR approach to provide a continuous growth profile along the fiber, and the ability of the neural system to "capture" the profile that characterizes the excavation are the keys to the success of the system.

From the parametric analysis, it appears that a detection system based on these principles is able to detect very narrow tunnels even at depths greater than 20 meters, with a limited number of false alarms.


To program moral robots

A series of articles about the iron fist

17 תגובות

  1. In 1977, they installed a CT device inside a satellite that was launched into orbit around the Earth. To the astonishment of the researchers, new things were discovered about the earth's core. If using this device they reached such high resolutions at a depth of thousands of kilometers, why not place such a device on a drone and reveal tunnels in this way?

  2. In my opinion, a system that detects earthquakes can be used for color purposes, it always feels vibrations in the ground
    I would suggest that the pegs of the separation fence be used as an earthquake sensor that is connected to a seismograph system in a control center, in my opinion simpler and more effective

  3. I support Ariel's idea - why can't a canal be dug from the sea around Gaza, and then each of their tunnels will simply be filled with water...

  4. Um..what if dig around Gaza and isolate it by creating a royal island like in Dubai :)
    They will feel like at home..:)

  5. The role of the IDF in this campaign is to change the existing facts on the ground and leave when the existing longer exist.

    Then we can start again (how can we not) only this time our eyes will be open not only above the ground, but below it as well. Hoping that such a system will come in within days or weeks from now..

  6. A big disadvantage: the system only discovers caves during excavation and not existing caves which make up the absolute majority of the sector.

  7. DUNE Ya Allah
    Well, soon you will draw inspiration from Star Wars.
    A space owner used her name all the time
    So maybe we will launch Gaza into another dimension like this and close the matter
    What an in-depth discussion!!!
    : )

  8. In the Philadelphia route it will be impossible to use the invention because the Hamas will destroy the system as soon as the IDF leaves the place.
    On the other hand, it will be possible to use it along our border with the Gaza Strip in order to prevent another kidnapping attack or the entry of suicide terrorists.

  9. You deserve ninety shekels.
    Go and treat yourself to ice cream at McBurger (the real name has been distorted to prevent free advertising)

  10. Has anyone read the book DUNE?
    In short, there is a story about giant underground worms that are able to sense things, including humans, by vibrations that repeat themselves like walking on sand (it's a desert)

    The simple solution to walking in the desert was to simply walk in random movements and not in a movement that repeats itself like a rhythm, this requires some training but it is a simple solution.

    The way to attract the worms was simpler and more beautiful in the movie (because of the sound effects) to simply put a device that hits the ground in regular rhythms

    Does the facility rely on regular digging rates?
    What about adding background noise on purpose to prevent the absorption of the "noise" of the excavation?
    Nice theory but like any new technology there are all kinds of "technical difficulties" and bugs.
    I brought some here, I saved money for the IDF, I'm unemployed and out of work at the moment, don't I deserve a small bonus? 🙂

  11. LOL Yariv, the IDF is not just what you see in front of your eyes. Believe me, there is a lot going on there under your nose. It is obvious that officials in the IDF know about the development

  12. Amazing! I hope that security officials in the IDF are informed about these developments, or at least occasionally read the science website...

  13. If the matter could be applied these days it would be great, but it is doubtful whether anything at all can be done in this campaign.

    In any case, the publication does not exclude or add to the Israeli side since the tunnels already exist and are currently being used without any choice. If it was working today, they would also come out of their burrows without any choice like mice and then... but that will probably wait for the next time. Until then, the advertising will actually do its job.

    Bottom line - right now the talk has no effect on the campaign, but in the future we will be able to greatly disrupt their underground activity even without an agreement and talks. Neither Egypt nor promises from Hamas. We will take back control.

    Good luck and soon these days..

Leave a Reply

Email will not be published. Required fields are marked *

This site uses Akismat to prevent spam messages. Click here to learn how your response data is processed.