Distributed Temperature Sensing, or DTS, uses optical fiber as a continuous temperature sensor over long distances. Instead of installing individual electronic temperature probes every few meters, a single fiber can provide a temperature profile across cables, tunnels, pipelines, conveyors, storage areas and other extended assets.
How DTS works Many DTS systems use Raman backscatter. A laser pulse travels through the fiber and a very small amount of light is scattered back toward the interrogator. The relative intensity of temperature-sensitive Raman components changes with the local fiber temperature. By measuring the return time, the system determines where along the fiber each temperature reading originated.
Continuous temperature profiles The key advantage of DTS is not simply measuring temperature. It is seeing temperature as a continuous spatial profile. Operators can identify hot spots, compare zones, detect rate-of-rise conditions and follow thermal behavior over time.
Power cable monitoring High-voltage cables are a major application. Cable loading capacity is influenced by conductor temperature, soil conditions, duct arrangement and surrounding thermal resistance. DTS can monitor the cable route and support dynamic cable rating, hotspot detection and asset-management decisions.
Fire detection Linear heat detection with fiber is useful in tunnels, cable trays, conveyor galleries, warehouses and industrial facilities. Because the sensing fiber is passive and immune to electromagnetic interference, it can operate in environments where conventional electronics are difficult to deploy.
Pipelines and industrial assets DTS can help identify temperature anomalies associated with leaks, process changes or insulation problems. In wells and pipelines, distributed temperature profiles provide information that would be impractical to obtain with sparse point sensors.
Performance considerations Important parameters include sensing range, spatial resolution, temperature accuracy, measurement time and fiber configuration. Installation geometry and thermal coupling strongly influence how quickly the fiber reflects the temperature of the surrounding asset.
DTS is most valuable when temperature is not a single point measurement but a distributed condition. By converting kilometers of passive optical fiber into a thermal map, it gives operators a continuous view of infrastructure that conventional sensors can only sample at selected locations.