Accession Number : ADD001114

Title :   Photon Radiation Detector.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON D C

Personal Author(s) : Jacobs,Harold

Report Date : 27 Feb 1973

Pagination or Media Count : 7

Abstract : The patent discloses a sensitive detector of incoming radiation, for example, infrared radiation, having a thin panel of a semiconductor material, the conductivity of which is a function of intensity of said incoming radiation, placed across a microwave waveguide into which microwave energy is supplied. If the waveguide is provided with tuning elements to control both attenuation and line-length in the region between the semiconductor panel and a microwave short, a lossy reflection cavity if formed and, by proper adjustment of said tuning elements, the microwave power reflected from the semiconductor panel and coupled through a directional coupler to an indicating device can be minimized. Conductivity changes in the semiconductor material resulting from exposure to said incoming radiation cause corresponding changes in the reflected electric field to occur which is proportional to the conductivity, and the consequent change in reflected power propagating through the directional coupler can be detected by conventional microwave detecting means and supplied to an indicating device calibrated to read intensity of the incoming radiation.

Descriptors :   *Infrared detectors, *Monitors, *Patents, Photons, Semiconductors, Photodetectors, Microwave equipment, Waveguide couplers, Panels, Reflectors, Power meters

Subject Categories : Test Facilities, Equipment and Methods
      Infrared Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE