DAS and DTS both turn an optical fibre into a sensor that reports continuously along its length. The difference is what they measure: DAS detects acoustic and vibration energy, DTS measures temperature. Choosing between them is a question about the physical quantity, not about which is more advanced.
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Call +86 130 4890 6506 to discuss selection and site conditions Email usDistributed acoustic sensing (DAS) uses the same physical arrangement as distributed temperature sensing: an interrogator connected to one end of a fibre, reporting against distance along it. What differs is the effect being read.
A DAS interrogator is sensitive to tiny, rapid changes in the fibre caused by acoustic and vibration energy arriving from the environment around it. Because the reporting is positional, a disturbance can be located along the route — this is what makes it useful for detecting events rather than just levels.
DTS reads a temperature-dependent scattering effect instead, and reports temperature against distance.
The practical differences follow from the physics:
DTS is the temperature method described on its own page. It is the one this site's product line is built around.
Raman scattering is the effect DTS uses. DAS generally relies on a different mechanism — detecting changes in the backscattered light caused by mechanical disturbance rather than a temperature-dependent band ratio.
OTDR shares the time-of-flight idea with both, but reports loss along a fibre for testing purposes rather than sensing the environment.
Point sensors — including ordinary accelerometers and discrete temperature sensors — measure at installed locations. DAS and DTS are both distributed: coverage comes from the fibre, not from how many devices were installed.
"DAS is the newer version of DTS." They are not versions of each other. They measure different physical quantities, and neither supersedes the other. A project that needs temperature is not better served by acoustic sensing, and the reverse is equally true.
"One fibre can do both at once." The two are typically deployed as separate instruments, and often on separate fibres within the same route. Sharing a single fibre between two interrogators is a design question with real constraints, not a default.
"DAS detects temperature changes caused by leaks." It can detect some leak-related events acoustically — the sound or vibration a leak produces. That is an acoustic detection, not a temperature measurement, and it will not see a slow thermal change that makes no noise.
"More data means a better system." DAS produces far more data than DTS. That is a consequence of what it measures, not an indication of quality, and it brings its own interpretation and storage burden.
"If a vendor offers one, they offer the other." Distributed sensing is a set of techniques, and suppliers specialise. Check what is actually being supplied rather than assuming the family implies the capability.
Choose DTS when the failure mode you must catch is thermal: overheating cables and joints, thermal rating of a route, fire or hot-spot detection, and condition trending over time.
Choose DAS when the failure mode is mechanical or acoustic: third-party interference near a pipeline or cable, intrusion detection along a perimeter, or leak-generated noise.
Some projects genuinely need both, because they have both failure modes. The honest way to decide is to start from the incidents you are trying to catch, then pick the physical quantity that changes when they happen — rather than starting from the instrument.
Our own export product lines are built around temperature measurement and the monitoring layer above it. We do not supply DAS. This page exists because the question comes up early in evaluation, and because answering it badly wastes a buyer's time.
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Both use a fibre as a distributed sensor. DAS detects acoustic and vibration energy along the fibre; DTS measures temperature along it. The choice depends on which physical change signals the problem you are trying to catch.
Neither, in general. A temperature problem is best detected by temperature measurement, and a mechanical or acoustic event by acoustic sensing. "Better" only has meaning once the failure mode is named.
The two are normally separate instruments, and often separate fibres in the same route. Whether a single fibre can be shared is a design question with real constraints, and it should be put to the suppliers involved rather than assumed.
Not the way a DTS does. DAS responds to dynamic strain — acoustic and vibration energy. It is also weakly sensitive to temperature change, because temperature alters the optical path length in the fibre, but slow thermal change is not what a DAS is specified or used for. A leak that produces a temperature rise but no acoustic signature will be missed.
No. Our fibre temperature work is built around temperature measurement and the monitoring layer above it. We say so here so that an evaluation does not spend time on a capability we do not offer.
Start from the incidents you must catch. Ask what physically changes when each one occurs — a rise in temperature, or a noise or vibration — and the sensing method follows from that answer.
If you are trying to decide whether your problem is thermal or acoustic, describe what you are trying to detect and where it would happen. We will tell you whether temperature measurement is the right answer — and if it is not, we will say so.
Call +86 130 4890 6506 · export@rebe-tec.cn