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17 September 1987 Fiber-Optic Pressure Sensor Using Birefringence In Side-Hole Fiber
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Proceedings Volume 0734, Fibre Optics '87; (1987)
Event: Sira/Fibre Optics '87, 1987, London, United Kingdom
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.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ph . Dabkiewicz and K. Jansen "Fiber-Optic Pressure Sensor Using Birefringence In Side-Hole Fiber", Proc. SPIE 0734, Fibre Optics '87, (17 September 1987);

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