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Temperature sensor on the base of light selective reflection

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The dependence of laser generation frequency from temperature in the distributed feedback laser based on cholesteric liquid crystal (CLC) can be used for creation of primary converter of sensor device for temperature controlling. it is well known [1], that the sensitivity CLC to temperature gives the possibilities to register the temperature with high accuracy (0,01 -0,001C ). The[...]

Application possibilities of nanoparticles for modification of parameters of liquid crystal materials

  Liquid crystal materials (LCs) are widely used as an optically active media of modern displays and information processing devices. This is due to the high sensitivity of these materials to various external influences and the ability to control their optical properties with the help of external electric and magnetic fields. The modification of the properties of the LCs for use as optically active media is provided mainly through the formation of multicomponent mixtures. However, this way of problem solving is practically exhausted. The introduction into anisotropic medium of objects whose dimensions are commensurate with the range of intermolecular forces and it provides significant changes in all physical parameters of this class of composite materials [1-7] can be perspective method. The aim of research presented in this paper was study of the effect of nanoparticles on the physical parameters of cholesteric liquid crystals: transition voltages, the dielectric anisotropy, the supramolecular helical structure pitch and Franck elastic constants. Application possibilities of nanoparticles for modification of parameters of liquid crystal materials (Możliwości modyfikowania parametrów materiałów ciekłokrystalicznych poprzez domieszkowanie nanocząsteczkami) prof. dr hab. inż. Zenon HOTRA1,2, prof. dr hab. inż. Zinoviy MYKYTYUK2, dr inż. Andriy FECHAN2, dr inż. Orest SUSHYNSKYY2, Olga YASYNOVSKA2, Volo dymy r KOTSUN2, Vasyl LEVENETS2, dr hab. inż. Wlo dzimi erz KALITA, prof. PRz1; dr inż. Grzego rz BŁĄD1 1 Politechnika Rzeszowska, Zakład Systemów Elektronicznych i Telekomunikacyjnych 2 Lviv Polytechnic National University, S. Bandera, Lviv, Ukraine 126 Elektronika 8/2010 Objects of research Nematic matrix 5 CB (4-n-pentyl-4-cyanobiphenyl) with the molecule length of 19,22 Å; Δε=+13,1 (at 288K); Tmelt = 295K; TNI = 308.3K and the nematic matrix 1289 based on cyanophenyl compounds with Δε=9,8 (at 288K), Tm[...]

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