Polarimetric fiber laser sensor for hydrostatic pressure

被引：27

作者：

Bohnert, K ^{[1
]}

Frank, A ^{[1
]}

Rochat, E ^{[1
]}

Haroud, K ^{[1
]}

Brändle, H ^{[1
]}

机构：

[1] ABB Switzerland Ltd, Corp Res, CH-5405 Baden, Switzerland

来源：

APPLIED OPTICS | 2004年 / 43卷 / 01期

关键词：

D O I：

10.1364/AO.43.000041

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A polarimetric Fabry-Perot fiber laser sensor for fluid pressure up to 100 MPa is investigated. The fluid acts on one of two elliptical-core fiber sections in the laser cavity, producing a shift in the differential phase of the two orthogonal polarization modes and thus a variation in the beat frequencies of the corresponding longitudinal laser modes. The second fiber section, with a 90degrees offset in the core orientation, compensates for temperature-induced phase shifts. The dispersion in the birefringent fiber Bragg grating reflectors is employed to remove the near degeneracy of the polarization mode beat frequencies of a given order and to improve substantially the resolution of the sensor to a few parts in 10(6) of the free spectral range. Further investigations address the effect of the fluid on the integrity of the fiber, the influence of various fiber coatings on the sensor response, and the intrinsic stability of erbium-doped and undoped sensing fibers under fluid pressure. (C) 2004 Optical Society of America.

引用

页码：41 / 48

页数：8

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