DAS resembles thousands of microphones along the sensing fiber. In railway applications, only a small fraction of all DAS data carries information about the train-rail interaction. Transforming the data to a rail view or train view simplifies analysis and reveals valuable rail and train properties.
Raman DTS systems provide an accurate measurement of temperature along a sensing fiber. This paper presents fundamental limits of measurement range for a DTS whilst providing a practical temperature and spatial resolution for most applications. Advances towards those limits are presented along with DTS measurements at a range of 70 km of fiber.
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