Abstract
Initial results of experimental studies of light propagation by optical fibers with liquid crystalline cores under hydrostatic pressure conditions are reported. Specially drawn hollow-core fibers (capillary tubes of radii 15 microns) were filled with a liquid crystal mixture. The whole system composed of the fiber and the liquid crystal has been placed in a high pressure chamber designed to sustain pressures up to 100 MPa. The liquid crystalline-core optical fiber acts as an optically anisotropic medium characterized by an index ellipsoid, and can serve as a fiber with easily controlled birefringence. Since hydrostatic pressure generate stress effects occurring in the system, a new class of fiber-optic pressure sensors can be introduced. The paper presents preliminary characteristics of the pressure sensor utilizing liquid crystalline-core fibers. Envisaged areas of applications include pipe-lines, mining instrumentation, process control, and environmental protection.
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