Rapid-scanning Fourier transform spectrometer for studies of propagation of near-millimeter-wave radiation through clear air and fog

Details Rapid-scanning Fourier transform spectrometer for studies of propagation of near-millimeter-wave radiation through clear air and fog Rapid-scanning Fourier transform spectrometer for studies of propagation of near-millimeter-wave radiation through clear air and fog

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988git..repts....b&link_type=abstract

Final Report, 28 Apr. 1980 - 30 Sep. 1987 Georgia Inst. of Tech., Atlanta.

Physics

Fog, Fourier Transformation, Millimeter Waves, Radio Transmission, Scanners, Spectrometers, Wave Propagation, Atmospheric Physics, Calibrating, Extremely High Frequencies, High Temperature Air, Interferometers, Mercury Lamps, Mirrors, Photolithography, Polarizers, Retroreflectors, Spectra, Transmittance, Transmitter Receivers

Scientific paper

A system has been developed to measure relative atmospheric transmission for the near-millimeter wave range of frequencies, 60 to 100 GHz. A 400 m long propagation range has been established. A transmitter/receiver system at one end of a link incorporates a rapid-scanning Fourier transform spectrometer. It involves a novel mirror drive which moves both interferometer mirrors simultaneously. The interferometric section is a polarizing Martin-Puplett type. The grid polarizers are made photolithographically. The source is a hot mercury lamp in a cavity, and the detector, an InSb photoconductive element. Scans of 7.5 GHz resolution require about 0.2 sec. A dihedral retroreflector 200 m from the transmitter/receiver reflects the signal back and completes the link. Calibration spectra are obtained from a short path to a second retroreflector. System tests are described.

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