Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-05-04
1978-09-19
Bauer, Edward S.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 96, 354227, 350340, 350341, 350153, G02F 113
Patent
active
041149904
ABSTRACT:
A cholesteric filled liquid crystal cell has one surface homeotropically aligned and the opposite surface homogeneous parallel aligned. Plane polarized light incident upon the homogeneous parallel aligned surface with its polarization plane parallel with or orthogonal to the alignment direction has its plane of polarisation rotated by an amount controllable by the application of an electric potential across the cell. This forms the active element of a simulated rotating pointer meter display having no moving parts and only a single pair of electrical inputs.
REFERENCES:
patent: 3854793 (1974-12-01), Kahn
patent: 3914020 (1975-10-01), Helfrich
Crossland William A.
Mash Derek H.
Morrissy Joseph H.
Bauer Edward S.
International Standard Electric Corporation
O'Halloran John T.
Van Der Sluys Peter C.
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