Accession Number : ADD011929

Title :   Optical Electromagnetic Radiation Detector.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Miceli,W J ; Ludman,J E

Report Date : 06 Aug 1985

Pagination or Media Count : 6

Abstract : An optical electromagnetic radiation detector having a probe for receiving nearby electromagnetic radiation. The probe includes a loop antenna connected to a pair of transparent electrodes deposited on the end surfaces of an electro-optic Fabry-Perot interferometer. When the loop antenna picks up the presence of electromagnetic radiation, a voltage will be developed across the crystal of the electro-optic Fabry-Perot interferometer thereby changing the optical length of the interferometer. A beam of light from a remote location is transmitted through an optical fiber onto the Fabry-Perot interferometer. The change in optical length of the Fabry-Perot interferometer alters the intensity of the beam of light as its is reflected from the Fabry-Perot interferometer back through the optical fiber to the remote location. A beamsplitter directs this reflected beam of light onto an intensity detector in order to provide an output indicative of the variations in intensity. The variations in intensity are directly related to the strength of the electromagnetic radiation received by the loop antenna. (Author).

Descriptors :   *PATENTS, *DETECTORS, *ELECTROMAGNETIC FIELDS, ELECTROOPTICS, LOOP ANTENNAS, VOLTAGE, FABRY PEROT INTERFEROMETERS, OPTICAL PROPERTIES, MODIFICATION, INTERFEROMETRY

Subject Categories : Electrooptical and Optoelectronic Devices
      Optics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE