Lidar Sensors for Highly Accurate Perimeter Protection Without False Alarms

LIDAR Sensors for Highly Accurate Perimeter Protection Without False Alarms

Perimeter protection solutions often consist of a physical barrier (like a gate, fence, wall, canal) and technology to monitor the state of the perimeter and detect intruders. Common technologies that are used are for intruder detection:

  • Video surveillance with video analytics
  • Thermal cameras
  • RF radar sensors
  • LIDAR laser sensors
LIDAR ACcurate intruder detection without false alarms

LIDAR may be one of the lesser known options. Which seems strange. It may be suprising to hear that LIDAR sensor technology is already deployed in some of the most prestigious and security critical infrastructures and building today. The reason for that is the unmatched performance of the technology in demanding intruder detection applications where it is of the highest importance that intruding objects do not remain undetected and where false alarms should be almost zero,

What is LIDAR?

LIDAR is an acronym for LIght Detection and Ranging. LIDAR devices send out pulses of laser light at a surface and measure the amount of time it takes for each pulse to bounce back.

An important characteristic of LIDAR devices is that they are capable of very accurately creating a ‘curtain’ of invisible laser beams. Which means that a ‘field of view’ very precisely can be determined. The curtain is consistent in shape, is not influenced by weather conditions and objects that are passing through the laser curtain are detected immediately.

Almost no false alarms

Video surveillance that uses AI to automatically detect intruding objects relies on image analysis. In perimeter protection it is important that an area close to the perimeter can be monitored. Two common causes of false alarms are the detection of harmless intruders (like birds or cats) or the detection of shades of objects that are actually not in the are that is monitored but are merely casting their shadow on the area. Specifically the last one is very common in video content analysis.

LIDAR sensors can position their laser curtain very precise and the curtain remains thin, even when longer distances are covered. Chances of objects accidentally moving into the field of view therefor are very limited. And shadows are not seen as objects, since they do not reflect the light.

Effective detection of intruders

LIDAR sensors use laser light beams that are invisible and harmless to the human eye. Their laser curtain however is very effective in detecting intruding objects. LIDAR devices can be configured easily using an onboard graphical user interface. Areas that need to be ignored can easily be masked.

LIDAR is not very susceptible to circumstances. It does not rely on images analysis, so weather conditions that change the background color of objects that need to be detected (like white objects in snow) do not influence the performance. Heat does affect the performance like it does with thermal cameras. And external sources of radio communications do not interfere the performance like they potentially do with RF based radar systems.

LIDAR is fast and accurate. In almost any condition.

DFSL Sensors vendor DFSL specializes in LIDAR sensors. They have introduced LIDAR in the security industry and thier list of references is impressives.

The biggest selling product is the DFSL PLS 200 35/60. This robust device is used to protect perimeters throughout the world, both in military and private installations. Normally around every other 100 meters one DFSL PLS 200 60 would be installed. It connects to security management systems using RS485 or IP communication. A relay contact is available for stand-alone applications.

In situations where there is no physical barrier, DFSL advises to use the DFSL LFS Series. These devises support even faster detection of intruding objects and are capable of creating a virtual fence.

Please contact us if you would like to learn more about DFSL products.

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