DTIC ADA248557: Detecting Microwave Emissions from Terrestrial pdf

DTIC ADA248557: Detecting Microwave Emissions from Terrestrial

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Description of the Book:

A Dicke receiver has been designed and constructed in our effort to detect the 22 GHz spontaneous emission from water vapor. The receiver compares the brightness temperatures of two waveguides, one containing gaseous H20 at low pressure, the other containing dry air. Each waveguide is terminated with polished brass, which provides a low background brightness temperature, at one end and connects to the input of the receiver at the other end. The system is capable of detecting a brightness temperature difference of about 0.2 deg K. In this experiment, the radiation from water vapor produced the brightness temperature difference between source and reference of 0.28 to 0.33 deg K The experimental results proved that emission from water vapor was being detected

• Creator/s: Defense Technical Information Center
• Date: 2/1/1992
• Year: 1992
• Book Topics/Themes: DTIC Archive, Ehlert, Thomas C, MARQUETTE UNIV MILWAUKEE WI, *WATER VAPOR, *MICROWAVE EQUIPMENT, *EMISSION SPECTRA, TEMPERATURE, AIR, LOW PRESSURE, WAVEGUIDES, MICROWAVES, BRIGHTNESS, FEASIBILITY STUDIES, RADIATION ABSORPTION, RECEIVERS, PRESSURE, BACKGROUND, SOURCES, BRASS, INPUT, EMISSION

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