Fiber Optic Intrusion Detection
A fiber optic intrusion detection system, also known as an optical fiber perimeter intrusion detection system, can be used to protect sensitive and valuable sites of any kind.
A fiber optic intrusion detection system can be considered one of the best solutions for sites and targets for both theft and terrorism. These spaces, usually protected with perimeter fencing, can be further implemented in terms of security with the aid of a high-quality fiber optic intrusion detection system.
With all fence-mounted systems, it is critical that the fence construction is of high quality, with no loose fabric, flexing, or sagging material. The fence should also have solid foundations for posts and gates. Otherwise, nuisance alarms may occur.
Several types of fence-mounted perimeter intrusion detection systems exist. These include electro-mechanical vibration sensing, coaxial strain-sensitive cable, fiber-optic strain-sensitive cable, and taut-wire systems.
Two styles of fence-mounted sensors are most prevalent and are described below: coaxial and fiber-optic fence sensing.
Coaxial strain-sensitive cable systems use a coaxial cable woven through the fabric of the fence. The coaxial cable transmits a dielectric field.
As the cable moves due to strain on the fence fabric caused by climbing or cutting, the electric field changes are detected within the cable, and an alarm condition occurs.
Coaxial strain-sensing systems are readily available and are highly tunable to adjust for field conditions due to weather and climate characteristics. Some coaxial cable systems are susceptible to electromagnetic interference and radio frequency interference.
Fiber-optic strain-sensitive cable systems are similar to coaxial strain-sensitive cable systems. The fiber-optic system uses a fiber-optic cable, rather than a coaxial cable, woven through the fence fabric. The strain on the fence fabric causes micro-bending of the fiber cable, which is monitored by the control panel, generating an alarm condition.
Fiber-optic strain-sensing systems are relatively newer detection systems but have a strong following. The systems are readily available and are highly tunable to adjust for field conditions due to weather and climate characteristics.
The systems are impervious to lightning, electromagnetic interference, radio frequency interference, or other electronic signals and can be used over long distances.
Possible defeat measures include tunneling, jumping, or bridging across the fence system. Careful climbing at corner posts may not generate sufficient vibration to generate an alarm condition.
Small Utility Tip: Fence-mounted sensor systems work well in areas without animals or passersby; otherwise, nuisance alarms may result.
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