Results 161 to 170 of about 2,392 (210)

Non-invasive microwave radiometry thermometry

Physiological Measurement, 1998
Near-field microwave radiometry and radiometric imaging are non-invasive techniques that are able to provide temperature information at a depth of up to several centimetres in subcutaneous tissues. They are based on the measurement of microwave electromagnetic thermal noise. This paper describes the basic principles, measurement methods and limitations
Y, Leroy, B, Bocquet, A, Mamouni
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Microwave radiometry of snow

Advances in Space Research, 1989
Abstract Microwave radiometry provides a useful tool to monitor the properties of snow cover on a global scale. The current state of knowledge of microwave response to dry and wet snow is discussed, and the effects of various snow, soil, and atmospheric parameters to the observed antenna temperature are reviewed.
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An example of thermometry in volume by microwave radiometry

IEEE Transactions on Biomedical Engineering, 1993
We depict a method of determination of the size D depth z and temperature T0 + delta T of a cylindrical thermal structure embedded in an homogeneous glossy material, in the present case, water. A microwave radiometric image at 3 GHz points out the location of the thermal structure; its threshold provides the diameter D of the structure.
Bertrand Bocquet, J. C. Van de Velde, Ahmed Mamouni, Yves Leroy   +3 more
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Microwave Radiometry and Thermography

1989
Based on the measurement of the electromagnetic thermal noise generated by living tissues, microwave radiometry is a starting point for a non invasive thermometric process in a depth of the subcutaneous tissues of up to several centimeters.
Y. Leroy, A. Mamouni, J. C. Van de Velde, B. Bocquet   +3 more
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Estimating Snow Characteristics with Multifrequency Microwave Radiometry

IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium, 2008
Microwave radiometric measurements of snow pack were carried out with ground based sensors in winter 2007-2008. Data collected on dry snow, showed small fluctuations related to diurnal solar cycle and presented a time delay of microwave brightness temperatures with respect to the snow surface temperature.
Brogioni Marco, MacElloni Giovanni, Palchetti Enrico, Paloscia Simonetta, Pampaloni Paolo, Pettinato Simone, Santi Emanuele, Cagnati Anselmo, Crepaz Andrea   +8 more
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MICROWAVE RADIOMETRY AND THE GEOGRAPHER

The Professional Geographer, 1969
(1969). MICROWAVE RADIOMETRY AND THE GEOGRAPHER. The Professional Geographer: Vol. 21, No. 2, pp. 119-121.
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Microwave radiometry and applications

International Journal of Infrared and Millimeter Waves, 1995
The radiometry in general is a method of detecting the radiation of matter. All material bodies and substances radiate energy in the form of electromagnetic waves according to Planck s Law. The frequency spectrum of such thermal radiation is determined, beyond the properties of a blackbody, by the emissivity of surfaces and by the temperature of a ...
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New Technique for Microwave Radiometry

IEEE Transactions on Microwave Theory and Techniques, 1963
An interference modulation technique for microwave radiometry is described. Use of the technique is considered for the development of a radiometer for tuning over a wide range of frequencies, a radiometric device for determining the absolute sensitivity of detectors over a wide range of frequencies, and a means for determining the power level of ...
M.W. Long, J.C. Butterworth
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Advances in microwave digital radiometry

IGARSS 2000. IEEE 2000 International Geoscience and Remote Sensing Symposium. Taking the Pulse of the Planet: The Role of Remote Sensing in Managing the Environment. Proceedings (Cat. No.00CH37120), 2002
The increasing availability of discrete and integrated high-speed digital logic has enabled the advancement of microwave digital radiometry for Earth science applications. The first digital radiometers were used for autocorrelation spectroscopy with bandwidths of a few megahertz.
J.R. Piepmeier, A.J. Gasiewski, J.E. Almodovar   +2 more
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Effect of dust on microwave radiometry

1992 IEEE Aerospace Applications Conference Digest, 1992
A description of the atmospheric effects on electromagnetic-wave transmission is obtained by modeling the attenuation due to water vapor, oxygen, rainfall, snow, clouds, and dust. The technique developed for calculating the attenuation due to dust is an extension to that used for calculating the attenuation due to rainfall, and it seems to be valid ...
S. Louza, N.F. Audeh
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