Distributed Temperature Sensing
Also known as: DTS
Definition
A fiber-optic sensing technology that measures temperature continuously along the entire length of a fiber-optic cable by analyzing temperature-dependent backscattered light variation, providing continuous thermal profiling without discrete sensors at intervals.
Key Points
- Measures temperature continuously along a fiber-optic cable's entire length by analyzing temperature-dependent variation in backscattered light, rather than requiring discrete temperature sensors placed at intervals along the monitored route
- Shares its core fiber-optic backscatter sensing approach with distributed acoustic sensing, but measures temperature rather than vibration — the two technologies are complementary siblings rather than competing alternatives, and can run on the same or parallel fiber infrastructure
- Provides continuous thermal profiling well suited to long linear infrastructure — pipelines, wellbores, power cables — where discrete point sensors would leave gaps between measurement locations that a continuous fiber-based approach doesn't
- A pipeline leak can produce a detectable localized temperature anomaly at the leak point, making DTS a genuine complementary or alternative leak detection technique alongside distributed acoustic sensing's vibration-based approach
- Downhole deployment specifically uses DTS to profile temperature along a wellbore's length, supporting reservoir characterization and operational monitoring alongside other downhole telemetry data sources
Concept
A DTS system sends light pulses down a fiber-optic cable and analyzes how the backscattered light's characteristics vary with temperature at each point along the fiber, building a continuous temperature profile along the entire monitored length rather than only at discrete sensor locations — the same fundamental backscatter analysis approach distributed acoustic sensing uses, applied to detecting temperature variation rather than vibration.
Explainer
The relationship between DTS and distributed acoustic sensing is complementary rather than competitive precisely because they measure genuinely different physical phenomena using a shared underlying sensing approach — a pipeline monitoring deployment can potentially run both temperature and vibration sensing along the same fiber infrastructure, gaining leak detection capability that cross-references temperature anomalies against vibration signatures for higher-confidence detection than either technique alone would provide. This is exactly why DTS functions as a genuine complementary or alternative pipeline leak detection technique: a leak's localized temperature signature, arising from the temperature difference between escaping product and the surrounding environment, is detectable through DTS independent of whatever vibration signature the same leak might also produce, giving operators two independent physical phenomena to correlate against for more reliable detection. For CE energy operations, DTS is directly relevant both for pipeline monitoring, where it complements distributed acoustic sensing's vibration-based detection, and for downhole applications, where continuous temperature profiling along a wellbore supports reservoir characterization and operational monitoring alongside other downhole telemetry data streams.
Cite this entry
Distributed Temperature Sensing. ConnectedEarth Knowledge Base. https://connectedearth.space/knowledge-base/distributed-temperature-sensing/ (updated 13 September 2026).