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All-fiber liquid crystalline hydrostatic pressure sensor

The paper introduces an all-fiber version of the hydrostatic pressure sensor with a chiral nematic liquid crystal film acting as a sensing element. The liquid crystalline film was obtained from a new class of liquid crystalline materials dispersed in a polymer matrix. As light sources, two laser diodes operating at red and infrared wavelengths were used, which were coupled to a compact liquid crystalline optrode. The optrode was placed inside a standard thermally stabilized high-pressure chamber designed to sustain pressures up to 500 MPa. Insertion of the optrode into the chamber was accomplished due to a fiber optic leadthrough system. The all-fiber liquid crystalline hydrostatic pressure sensor offers high response to pressure and, depending on the liquid crystalline optrode used, can be preset for a required range of pressure. Potential areas of applications include pipelines and mining instrumentation, process-control technologies, and environmental protection.