Optical fiber distributed acoustic sensor (DAS) and distributed temperature sensor (DTS) are considerably desirable formany important applications including oil and gas industry. Simultaneous measurements of vibration and temperaturewill exclude the need for two separate DAS and DTS systems, reduce overall cost, and ensure continuous real-timemonitoring of these two important sensing parameters. We here devise a hybrid DAS-DTS system using a few-modefiber (FMF). Although the system requirements for DAS and DTS are quite different, FMF is considered an idealcompromise to satisfy the requirements of the two systems.
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