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Proceedings Paper

Fiber-Optic Pressure Sensor Using Birefringence In Side-Hole Fiber
Author(s): Ph . Dabkiewicz; K. Jansen
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Paper Abstract

An experimental pressure sensor for pressures up to 1000 bars is described, in which a side-hole fiber is exposed directly to an unknown hydrostatic pressure. The cross-section of the fiber resembles that of a PANDA fiber but it has two open channels in place of the stress applying parts. A hydrostatic pressure acting from outside on the fiber builds up an anisotropic elastic stress in the fiber core which elasto-optically induces birefringence. The resulting phase delay, which changes linearly with pressure, is counted bi-directionally in a polarimetric setup. Thus the sensor operates in an incremental mode. With a pressurized fiber length of 10 cm, a phase sensitivity of 7.78 rad/(bar•m) at X = 1300 nm, and a resolution of the optical phase of 7/2, a pressure resolution of π/2 bars is achieved. In the pressure range of 100 - 1000 bars where unambiguous phase evaluation is possible, the overall accuracy is better than ± 0.5%. In one fiber, phase evaluation becomes ambiguous below 100 bars, near the point where the birefringence vanishes.

Paper Details

Date Published: 17 September 1987
PDF: 5 pages
Proc. SPIE 0734, Fibre Optics '87, (17 September 1987); doi: 10.1117/12.938018
Show Author Affiliations
Ph . Dabkiewicz, Technische Universitat Hamburg-Harburg (Germany)
K. Jansen, Technische Universitat Hamburg-Harburg (Germany)

Published in SPIE Proceedings Vol. 0734:
Fibre Optics '87
Lionel R. Baker, Editor(s)

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