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Proceedings Paper

Multimode optical fiber polymer-dispersed liquid crystal electric field sensor
Author(s): Beatrys M. Lacquet; Pieter L. Swart
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Paper Abstract

Modulation of light scattering by liquid crystal droplets dispersed in a polymer matrix by an electric field forms the basis of a compact electric field sensor. A thin layer of polymer dispersed liquid crystal is interspersed between two cleaved end faces of multimode fiber. In the absence of an electric field the droplets are randomly oriented. The anisotropy of the refractive index of the liquid crystal causes light to be scattered out of the acceptance angle of the receiving fiber. As the major axis of the indicatrix of the droplets aligns with the field, the anisotropy in refractive index is lowered. The fraction of the light which is scattered is therefore reduced. In this paper we report on the properties of an electric field sensor envisaged for application to overhead transmission lines and utility substations. We discuss linearity, hysteresis, and the effect of temperature on the sensor.

Paper Details

Date Published: 5 August 1996
PDF: 5 pages
Proc. SPIE 2872, Second Pacific Northwest Fiber Optic Sensor Workshop, (5 August 1996); doi: 10.1117/12.245578
Show Author Affiliations
Beatrys M. Lacquet, Rand Afrikaans Univ. (South Africa)
Pieter L. Swart, Rand Afrikaans Univ. (South Africa)

Published in SPIE Proceedings Vol. 2872:
Second Pacific Northwest Fiber Optic Sensor Workshop
Eric Udd, Editor(s)

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