Photonic electromagnetic field sensor apparatus

Details Photonic electromagnetic field sensor apparatus Photonic electromagnetic field sensor apparatus

1992-09-30

1993-09-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

343754, H01J 516

Patent

active

052431860

ABSTRACT:
An electromagnetic field sensor apparatus which measures the amplitude, pe, frequency and polarization of an incoming electromagnetic field as well as the angle of arrival of an incident electromagnetic field. A Luneberg lens focuses an incoming electromagnetic wave entering on one side of the Luneberg lens onto a point on the opposite side of the lens. A pair of photonic sensor which may be electro-optic modulators or Pockel cells are positioned on the Luneberg lens at the point upon which the incident electromagnetic wave is focused. The sensing axis of one of the electro-optic modulators is perpendicular to the sensing axis of the other electro-optic modulator. Polarized light is provided to each photonic sensor along an optical path which passes through the sensor. Each photonic sensor modulates the polarized light passing therethrough when the photonic sensor detects the incident electromagnetic wave. A photo-detector located along the optical path for each photonic sensor detects the modulated light as it exits from the photonic sensor. The signal output of each photo-detector is electrically coupled to a power combiner and divider circuit which in combination with a network analyzer is utilized to measure the polarization of an incident electromagnetic wave.

REFERENCES:
patent: 4458249 (1984-07-01), Valentino et al.

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