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13 December 2000 Fiber optic sensors on the base of liquid crystals
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Proceedings Volume 4239, Lightguides and their Applications; (2000)
Event: Lightguides and their Applications, 1999, Krasnobrod, Poland
The new approach to multifanctional sensor of physical values designing on the base of fibre lightguides (FL) with a control birefringence and liquid crystal material is proposed. The fiber principle of operation is based on light beam, which passes through the lightguide, weakening under the external influence. As an informative parameter the light amplitude, phase, frequency or polarization can be used. The sensors can be divided by their functional purpose in FL circuit: as a sensitive element or as an optical channel, that connects the separate elements. The cell with liquid crystal active medium contains a FL in cell bulk. In presence of external influences (temperature, pressure, electric and magnetic fields etc.) the liquid crystal molecule orientation leads to change optical characteristics of the active material. This process is determined by light flow parameters in FL. Such a sensor construction gives the FL and liquid crystal element with a thickness of 25 mm. The induced cholesterics on the base of cyanobifenil mixtures and high effective non-liquid crystals dopant BIXH for control of physical parameters are investigated. The sensor allows to measure the electric fields — about 106V/m, magnetic fields - up to 1 T and temperature ranging from 243K to 333K.
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Zenon Y. Gotra, Olexandra Gotra, Zenoviy M. Mykytyuk, Roman Zayats, and Bogdan Stadnyc "Fiber optic sensors on the base of liquid crystals", Proc. SPIE 4239, Lightguides and their Applications, (13 December 2000);

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