DiTemp Harsh + Reading Unit

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High-accuracy and long-range distributed temperature sensing systems (DTS) for harsh environments.

The DiTemp Harsh+ Reading Unit is designed for distributed temperature measurements over distances of up to 30 km with 1 m spatial resolution and 10s measurement time. Featuring a built-in 4-channel multiplexer, it is designed for use as a stand-alone unit in harsh environments. It features low energy consumption and an extended operational temperature range. Depending on configuration and redundancy, the DiTemp system has been assessed as SIL 1 or SIL 2 compatible (Safety Integrity Level ).

The DiTemp Harsh+ is a unique tool for the measurement of distributed temperature over several kilometers in harsh environments (from desert to arctic). It is a powerful diagnostic instrument for the identification and localization of potential problems. It allows the monitoring of local temperature at thousands of locations using a single optical fiber and in just one measurement. Its inherent high stability and the self-referenced principle of operation allow online or off-line long-term monitoring of large structures.

The measuring principle is based on the RAMAN effect and the Optical Time Domain Reflectometry (OTDR) method. Laser pulses are coupled into the fibers where the photons interact with the molecules of the fiber material. Some photons are scattered backward, and they carry information on the thermal motion of the molecules they were scattered by. Consequently, the spectrum of the backscattered light carries information on the temperature of the fibers. This effect can be used to measure temperature along the optical fiber.

The system is used in a wide range of applications that require distributed temperature sensing, such as temperature monitoring of concrete in massive structures, leakage detection of pipelines, seepage monitoring in dams and levees, waste disposal sites, and smart buildings, just to name a few.