CIRCUMFERENTIAL STRAIN ATTENUATOR

摘要

An apparatus for varying the gain of a fiber optic sensor that non-intrusive ly senses the strain response of a pipe includes a circumferential strain attenuator that has a annular land portion that mechanically couples the attenuator to the pipe. An annular web extends coaxially from the land porti on and has a reduced cross sectional area relative to the land and an annular mandrel portion extends coaxially from the web portion and forms a gap betwe en the pipe and the mandrel. The fiber optic sensor is wound on the circumferential strain attenuator. The web and mandrel cooperate to reduce t he strain response of the fiber optic sensor relative to the strain response of the pipe.