Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-11-17
1990-02-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231R, 324 96, H01J 4014, G01D 534
Patent
active
048990426
ABSTRACT:
Integrated optic sensors for measuring electric, magnetic and temperature fields. Each sensor comprises an interferometer that includes first and second arms, each arm comprising an optical waveguide formed in a substrate. The interferometer includes a field sensitive material positioned adjacent the first arm for varying the optical path length of the first arm in accordance with the applied field. Electric, magnetic and temperature field sensors are provided that are based upon stress induced refractive index changes induced in the first arm. Electric and magnetic field sensors are disclosed based upon evanescent field coupling between the field sensitive material and the first arm. A dual ring resonator embodiment is also described.
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