An apparatus for varying the gain of a fiber optic sensor that non-intrusively 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 portion 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 between the pipe and the mandrel. The fiber optic sensor is wound on the circumferential strain attenuator. The web and mandrel cooperate to reduce the strain response of the fiber optic sensor relative to the strain response of the pipe.
申请公布号
WO0244658(A1)
申请公布日期
2002.06.06
申请号
WO2001GB05277
申请日期
2001.11.29
申请人
WEATHERFORD/LAMB, INC.;HARDING, RICHARD, PATRICK
发明人
CROTEAU, PAUL, F.;GYSLING, DANIEL, L.;DIENER, JAMES, M.