Accession Number : ADD018500
Title : Photonic Electromagnetic Field Sensor for Use in a Missile.
Descriptive Note : Patent, Filed 1 Jun 93, patented 24 Jan 95,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Hilliard, Donald P ; Mensa, Dean L
Report Date : 24 Jan 1995
Pagination or Media Count : 15
Abstract : An electromagnetic field sensor for use in a target seeking missile which measures the amplitude, phase, frequency and polarization of an incoming electromagnetic field as well as the angle of arrival of the incident electromagnetic field. A Luneberg lens is mounted in the radome of the missile. The Luneberg lens focuses an electromagnetic wave reflected from a target which then passes through the radome and enters the Luneberg lens on one side of the lens onto a point on the opposite side of the lens. A photonic sensor which may be a single electro-optic modulator or a pair of electrooptic modulators is positioned on the Luneberg lens at the point upon which the incident electromagnetic wave is focused. When a pair of electro-optic modulators are used as the sensor the sensing axis of one of the electrooptic modulators is generally perpendicular to the sensing axis of the other electro-optic modulator. Polarized light is provided to each electro-optic modulator of the sensor along an optical path which passes through the modulator. Each electro-optic modulator modulates the polarized light passing therethrough when the electro-optic modulator detects the incident electromagnetic wave. A photo-detector located along the optical path for each electro-optic modulator detects the modulated light as it exits from the electro-optic modulator.
Descriptors : *ELECTROMAGNETIC FIELDS, *PATENTS, GUIDED MISSILES, OPTICS, POLARIZATION, DETECTORS, ELECTROOPTICS, LIGHT, PATHS, ANGLE OF ARRIVAL, ELECTROMAGNETIC RADIATION, PHOTONS, HOMING DEVICES, SIDES, RADOMES, MODULATION, GUIDED MISSILE TARGETS, MODULATORS, LENSES, LUNEBERG LENSES
Subject Categories : Electricity and Magnetism
Distribution Statement : APPROVED FOR PUBLIC RELEASE