Abstract: Long-range distributed strain and temperaturemeasurements along an optical fiber is presented, usinga novel optical sensor based on stimulated Brillouinscattering. The optical effect only depends on thefiber material, so that the bare fiber itself acts assensing element without any special fiber processing orpreparation. The sensor accuracy is plus or minus 1degree Celsius for temperature and plus or minus 20$mu$epsilon for deformation. The spatial resolution is1 meter and the sensor range is more than 20 km.Successful monitoring of a concrete dam element hasbeen performed using an embedded standard cabled fiber.The temperature dynamics of lake waters have been alsoobserved by simply laying a cable over the lake bed. !5
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