Electric and electromagnetic field sensing system including an o

Details Electric and electromagnetic field sensing system including an o Electric and electromagnetic field sensing system including an o

1992-01-31

1994-01-18

Messinger, Michael

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022727, 2502311, 385 12, 356352, 324 96, 3242441, H01J 516, G01D 534, G01B 902

Patent

active

052801730

ABSTRACT:
A method and apparatus for sensing electric and electromagnetic fields incorporating a fiber-optic transducer which mounts directly on a conventional optical fiber waveguide. The transducer employs a conductive Fabry-Perot microcavity bounded by a conductive, thin and corrugated diaphragm. When the conductive microcavity is placed in an electric field, the electric field is excluded from within the equipotential microcavity and a net electrostatic force acts on the diaphragm. Likewise, when the conductive microcavity is exposed to an electromagnetic wave, the wave exerts a radiation pressure on the diaphragm. In both cases, the diaphragm deflects linearly and uniformly under the influence of the extremely low electrostatic pressures which are induced. The diaphragm deflection modulates the reflectance within the optical fiber by varying the gap of the cavity. The change in reflected light is measured and correlated to the field strength using an improved dual-wavelength referencing technique which compensates for bending and transmission losses in the optical fiber.

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