Applications of Nematic Liquid-Crystals to Electric-Field Sensors

Sato, Susumu; Kushima, Masahito

doi:10.1541/ieejeiss1987.109.10_725

Cited by 1 publication

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“…The orientations can also be changed by the external electric field even if voltages are not directly applied across the electrodes of the cells, then the electric and magnetic field sensor was proposed by using the change in the optical properties of nematic LC cells. Both reflection and transmission type field sensors were prepared by using the nematic LC cell and an optical fiber (3), (4) . The LC sensor is lightweight and materials used are not expensive compared with the magnetooptic effect(')-(') of the crystalline materials.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Detection of an Electric Field and a Small Quantity of Decomposition Products by Use of Several Sensor Heads and OTDR Method

Kawamura

Sato

1999

IEEJ Trans. SM

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The simultaneous detection method for both an electric field and a small quantity of decomposition products is proposed by using a sensor head which consists of a twisted nematic (TN) liquid crystal (LC) cell sandwiched between a pair of cholesteric LC cells and a corner cube prism coated with dye films . The electric field can be detected as changes of optical retardations induced in the TN LC cell at the wavelength of a selective reflection band of the cholesteric LC . The ppm concentration of the decomposition products generated from an electric discharge in SFs can also be optically detected as spectrum changes of dye films deposited on the prism at the other wavelength outside the selective reflection band. The optical sensing system using the several sensor heads and an OTDR (Optical Time Domain Reflectometry) method can be applied to monitor and detect simultaneously the electric field and the decomposition products at two different wavelengths . In addition, their locations can also be determined.

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Section: Introductionmentioning

confidence: 99%