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Perimeter security system using fiber optic cable


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INTRODUCTION: As technology evolves, security becomes focus of attention. Most people think of additional lighting or adding a security camera system. But high value location many want to consider perimeter fencing.

Perimeter fencing involve more than just putting a fence up. Patrolling and other traditional methods with sensors and instruments are often unreliable and expensive. Some systems even have so many false alarms causing distrust in the system.

For a more reliable perimeter fence, fiber optic sensing cable may be considered. A fence mounted fiber optic sensing cable for vibration detection and a central sensing device analyzes both the magnitude and pattern of the vibration signatures.
Fiber optic sensing cable is more Responsive(Low false positive rate due to noise generated by environmental factors), Reliable(High reliability for detection(: Stand alone system, integrated with pan-tilt cameras and other technologies like infrared systems).
This presentation on Perimeter fence security system using fiber optic cable explains basics of the system and some examples of real life uses…

Published in: Engineering
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Perimeter security system using fiber optic cable

  1. 1. Perimeter fence security using fiber optic cable • Introduction • Advantages • Basic Concepts • Examples
  2. 2. Prof. Madhumita Tamhane O Security needs more than just putting a fence up. O Traditional methods : O are often unreliable and expensive. O may have false alarms. O cause distrust in system. Introduction
  3. 3. Prof. Madhumita Tamhane O Fiber optic sensing cable : O is more reliable perimeter fence. O is fence mounted fiber optic sensing cable. O is used for vibration detection. O uses central sensing device to analyse magnitude and pattern of vibration signatures. Introduction
  4. 4. Prof. Madhumita Tamhane Advantages O Fiber-Optic security is very difficult to defeat. O Responsive: Low false positive to noise generated by environmental factors. O Reliable: High reliability of intrusion detection. O (extremely low false negative). O Accurate. O Flexible. O Resistant to environmental effects. O Requires little or no maintenance. O Long life.
  5. 5. Prof. Madhumita Tamhane Basic Concept O System involves: O A fiber optic cable around the perimeter, O Laser diode LD feeding the cable O Coupler O Photo detector PD. are
  6. 6. Prof. Madhumita Tamhane Basic Concept O Laser diode LD feeds fiber optic cable through optical coupler. O Coupler splits optical power into fiber loop in two counter directional paths. O Two counter directional light packets when combined, cause interference along the loop. O The light interference is detected by a photo diode (PD). O Under static conditions, interference and its strength are constant.
  7. 7. Prof. Madhumita Tamhane Basic Concept O When intruder induced vibration is applied to fiber: O Refractive index in region of vibration changes. O Interference and its strength fluctuate. O Emitted light arrives at vibration point with some difference in time. O After passing the vibration point: O two counter directional light packets are combined, O Causes change in interference pattern. O The light interference is detected by a photo diode (PD).
  8. 8. Prof. Madhumita Tamhane Examples: Military O Alarm Processing Unit of highest standards in probability of detection. O Low nuisance/false alarm rates. O Advanced tuning capabilities. O Optimize detection and tuning according to unique site conditions. O High level of security.
  9. 9. Prof. Madhumita Tamhane Examples: Transportation & Aviation O Theft, sabotage and terrorism are security concern at airports, rail and sea ports. O Equipment needs to thrive in very harsh environments. O High performance and reliability are expected. O Airports have radar and radio emissions over many frequency ranges. O Electrical or electromagnetic sensors unreliable. O Sensors highly subjected to electromagnetic interference.
  10. 10. Prof. Madhumita Tamhane Examples: Transportation & Aviation O Fiber-optic sensor is not affected by radio frequencies or electro-magnetic interference. O Most reliable solutions for perimeter security applications.
  11. 11. Prof. Madhumita Tamhane Examples: Oil and Gas O Laser light through sensor is analyzed for distortion to detect threats. O Remote capabilities allow alarm processing units at central location. O Reduces cost.
  12. 12. Prof. Madhumita Tamhane Examples: Oil and Gas O Eliminates need for communications and power in the field. O Only passive optical components are installed in the field. O Insensitive to vapors, fumes, EMI, RFI, lightning or proximity to electrical cables. O Environmental conditions such as temperature, lightning, corrosive liquids and gasses are irrelevant. O Ideal choice in these environments.
  13. 13. Prof. Madhumita Tamhane Examples: Electrical / Substation O Security impacts reliability of electrical grid in a city or town. O Susceptible to attacks or threat by terrorist/saboteur. O Unauthorized access eendangers lives of intruders, employees and inhabitants of nearby community. O Optical fiber sensors are most optimum solution in this situation.
  14. 14. Prof. Madhumita Tamhane Examples: Corrections facility O Located in remote areas with limited lightning in security systems. O Perimeter security applications are built on fiber-optic intrusion detection systems. O Initiates appropriate and timely response.
  15. 15. Prof. Madhumita Tamhane Examples: Protected Distribution Systems O Network backbone are vulnerable to intruders. O This system physically protect passive optical networks. O Used to alarm network conduit or raceway. O Lowest cost.
  16. 16. Prof. Madhumita Tamhane O O er-fence-security-system-using.html O 19/issue-3/features/the-use-of-fiber-optics-in-security- and-surveillance-systems.html O O Reference