Photo-electric detectors and PIR (passive infrared) detectors are not the only choice when it comes to perimeter security applications. Thermal imaging cameras are now a viable proposition.

While photo-electric sensors – which use an infrared break beam to protect perimeter security, can be used for low security perimeter protection, PIR detectors can be prone to give false alarms and are unable to identify the event that triggered the alert.

A thermal imaging camera will capture infrared energy sources. This energy is given out by any objects emitting heat, such as human beings. The camera then converts this energy into visible light.

As thermal imaging technology uses heat to produce images, no external light is required for the system to function effectively. This means it works without sunlight or artificial light.

Thermal Imaging technology detects people and objects in the darkest of nights and in harsh weather environments, rain, smoke and light fog, enabling the monitoring and detection of activity over considerable distances.

Being able to operate without any light whatsoever and producing clear, crisp images gives a huge benefit to security applications. Intruders won’t even know they’re being observed allowing appropriate and rapid action to be taken.

The iconic London Eye as a highly visible tourist attraction needs to ensure high levels of security day and night and as part of their security they have installed a FLIR thermal imaging solution.

The core of the thermal imaging cameras that are installed at the London Eye are FLIR Systems Photons. Equipped with a 320 x 240 pixels Vanadium Oxide detector, they produce a crisp thermal image on which the smallest of details can be seen. Furthermore, since they contain an uncooled detector they are maintenance free which is a main advantage when they are installed in hard to reach areas.

The images produced by the thermal imaging cameras are not only being watched by security staff. In order to eliminate human errors, they are also combined by with Video Analytics. Reliable intrusion detection is based on the ability of a system to discriminate between background activity and unusual events that require investigation by guards.

Eric Dench the Security Manager at the London Eye says, “Thanks to thermal imaging, the London Eye became even safer than before. Visitors of this major attraction can be assured that everything is in place to guarantee them a first class, and safe, experience”.