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Results for “k-band”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 19 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1951

Preliminary results of a determination of temperatures of flames by means of K-band microwave attenuation

The temperature effects on the attenuation of K-band microwaves, at a frequency of 26,500 plus or minus 30 megacycles per second, through natural-gas and propane flames containing added alkali halide salts, were investigated over a temperature range from 1900 to 2500 K. The preliminary data of this investigation indicated that the attenuation varies appreciably with the sodium-line-reversal temperatures of the flames and is independent of the particular hydrocarbon fuels that were used for temperature sources and of the particular halide components of the compounds used in the concentrations employed to produce easily measurable attenuation. A reproducibility of plus or minus 25 K was obtainable.

RESEARCH EQUIPMENT AND TECHNIQUES↗
NASA NTRS1970

Snowfield mapping with K-band radar

Snow field mapping with K band radar imagery determining signal return difference with surrounding terrain, noting role of volume scattering and old snow structure

Macdonald, H. C.↗
NASA NTRS1972

Low noise microwave receiving systems on a 64 m antenna.

Review of the performance capability at S-, X- and K-band of the NASA/JPL 64-m Cassegrain antenna at Goldstone, California. The multiple feed system allows X- and K-band atmospheric research studies to be conducted simultaneously with mission directed S-band spacecraft tracking. A description of the antenna system and its multiple operation is followed by gain and efficiency comparisons at the three frequencies. The total operating system temperature and its frequency dependence are discussed. Antenna gain and efficiency, and zenith system operating temperature are summarized at S- and X-band, respectively, by 62 dB, 63%, 16K; and 72 dB, 52%, 24K. Preliminary measurements for K-band are 76 dB, 39%, 29K.

Reid, M. S.↗
NASA NTRS1967

Radio astronomy

Radio astronomy - Haystack-Millstone OH INTERFEROMETER, K-band spectrum measurements of sun, inference of atmospheric attenuation from balloon flights, and microwave emission

RADIO ASTRONOMY↗
NASA NTRS1970

Geologic studies of Yellowstone National Park imagery using an electronic image enhancement system

The image enhancement system is described, as well as the kinds of enhancement attained. Results were obtained from various kinds of remote sensing imagery (mainly black and white multiband, color, color infrared, thermal infrared, and side-looking K-band radar) of parts of Yellowstone National Park. Possible additional fields of application of these techniques are considered.

Smedes, H. W.↗
NASA NTRS1972

Electron density measurements of an inhomogeneous plasma using millimeter wave Fabry-Perot interferometers.

The electron density of a laboratory generated inhomogeneous plasma was measured using 60-90, GHz flat-plate and 150 GHz semi-confocal Fabry-Perot interferometers. The plasma was a negative glow-type and had a measured parabolic electron density profile. An analytical comparison between the derived equations of electron density for an assumed homogeneous plasma slab and an inhomogeneous plasma with parabolic distribution showed that the slab approximation was valid for such a profile. Comparison of measured values of electron density with those using X-band and K-band interferometers for the same plasma indicated good agreement.

Kendall, B. M.↗