SSS RaySense Fiber Optik Sensör Kablosu

At the heart of DAS technology are standard telecommunication optical fibers, which are already widely deployed and easy to install in various environments. These fibers are typically used for data transmission but can be repurposed for acoustic sensing without any modifications.

The RaySense processor, called an interrogator, sends short pulses of laser light down the optical fiber in rapid succession. Each pulse travels the full length of the sensor cable.

As each pulse travels, tiny natural imperfections in the glass reflect a small amount of light back toward the processor. This effect, known as Rayleigh backscatter, produces a stable reflection pattern when the cable is undisturbed.

When sound or vibration reaches the cable, it slightly stretches and compresses the fiber and changes the reflection pattern at that point. The processor continuously compares the returning light against the baseline to spot these changes.

Because light travels at a known speed, the time between sending a pulse and receiving a changed reflection tells the processor where along the cable the disturbance occurred.

Signal processing compares the vibration signature against known patterns such as footsteps, digging, vehicle movement, cutting or climbing. This helps the system separate meaningful events from routine background activity.

Classified events are mapped to zones and locations on the perimeter and passed to the security system as alarms, so operators see what happened and where without walking the line.