Raman Based Optical Fiber Distributed Temperature Sensing (DTS)

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Raman Based Optical Fiber Distributed Temperature Sensing (DTS)

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Raman Based Fiber Optic Distributed Temperature Sensor

Distributed temperature sensing systems (DTS) are fiber optic based optoelectronic instruments which measure temperature along the length of the fiber optic sensing cable. The unique feature of a distributed temperature sensing system is that it provides a continuous (or distributed) temperature profile along the length of the sensing cable and not at discrete sensing points which must be pre-determined.



Fiber Optic Temperature Sensor How It Works

DTS systems contain a pulsed laser which sends in an approximately 1m pulse (equivalent to a 10ns time) into the fibre optic. As the pulse travels along the length of the fiber optic, it interacts with the glass. Due to small imperfections in the glass, a tiny amount of the original laser pulse is reflected back to towards the DTS sensing system. By analysing the reflected light the DTS is able to calculate the temperature of the event (by analysing the power of the reflected light) and also the location of the event (by measuring the time it takes the backscattered light to return) to typically within a metre.

Distributed Temperature Sensing Cable

Typically DTS technology uses a standard telecoms fiber optic cable and specialised cables or sensing points are only required if measurements are required at temperatures greater than 100°C. The sensing fiber is typically based on multimode fibers for shorter ranges (up to 40km) and single mode fiber for long ranges (40-100km).

Fiber Optic Temperature Measurement Specification For DTS

Distributed temperature sensing systems can typically locate the temperature to within a distance of 1m (this is known as spatial resolution) with accuracy to within ±1°C and with a sensing resolution down to 0.01°C. However, there is an inverse relationship with measurement resolution, range and sampling time i.e. the temperature resolution degrades with range and improves the longer time you acquire data for a specific measurement.

Additional Information

Additional Information

Part Number RAY-DTS-R-01
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