Distributed optic sensors enable real-time monitoring across long distances using fiber optic cables. Traditionally, point sensors are used to monitor conditions at specific locations. However, distributed optic sensors can provide continuous sensing along the entire length of an optical fiber. This allows them to detect changes across large structures and areas.

How Distributed Fiber Optic Sensing Works

Distributed Fiber Optic Sensor take advantage of optical time domain reflectometry (OTDR) technology. In OTDR, a pulse of light is injected into the fiber and any backscattered light is measured. Imperfections along the fiber cause a small amount of light to scatter backwards. The location and strength of these backscatter signals provide insights into the condition of the fiber.

In a distributed sensor, the backscatter profile of the fiber acts as a distributed sensing element. Perturbations like strain, temperature changes or acoustic/vibration signals will introduce modulations to the backscatter signatures. By comparing measurements over time, these modulations can be detected and localized to specific positions along the length of the fiber. This enables continuous monitoring without needing discrete sensors at set points.

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