Complex permittivity measurements at 8 6 mm wavelength over the temperature range 1-60 C

Grant, E H; Shack, Roland V.

doi:10.1088/0508-3443/18/12/319

Cited by 39 publications

(17 citation statements)

References 21 publications

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“…Calculated e 1 , s, a values are given in Table 1. The values for pure water at 298 K (e 1 = 4.5 and s = 8.1 · 10 À12 s) are in good agreement with literature data [33,34]. As can be seen, the distribution of relaxation times is more pronounced in aqueous solutions than in pure water.…”

Section: Determination Of Hydration Numberssupporting

confidence: 90%

Dielectric spectroscopy and micellization of aqueous solutions p-isononylphenoloxyethyleneglycolether

Usacheva

Lifanova

Zhuravlev

et al. 2005

Journal of Non-Crystalline Solids

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Section: Determination Of Hydration Numberssupporting

confidence: 90%

Dielectric spectroscopy and micellization of aqueous solutions p-isononylphenoloxyethyleneglycolether

Usacheva

Lifanova

Zhuravlev

et al. 2005

Journal of Non-Crystalline Solids

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“…For most of the parameters we do not find a standard deviation which increases with increasing number of fit-parameters -in contrast to the results for one frequency. It seems that the correlation between the relaxation parameters is less in this case Tables 3 and 4 give examples of the numerical coupling of a and as already mentioned by Grant et al [8]. It is difficult to determine both quantities together; so the standard deviation of e^ increases in the 4-parameter fit, and unphysical negative values of a appear if 5 or 6 parameters are fitted.…”

Section: T(t) = H/kt Exp( -Ah/rt) Exp( -As/r)mentioning

confidence: 71%

“…As a tool to find additional possible errors sources we have compared spectra, in which a systematic error is simulated, with spectra of the usual form (8). The difference of these spectra is in many cases typical for a certain type of error.…”

Section: Diode Characteristicmentioning

confidence: 99%

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High Precision Measurements of the Permittivity of Water in the Microwave Range

Steinhoff

Redhardt

Lieutenant

et al. 1990

Zeitschrift Für Naturforschung A

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A practical version of a homodyne method for measuring the complex permittivity of high loss liquids at 3 and 9 GHz is described. The systematic errors are discussed in detail, because the homodyne method seems to be suitable as a simple standard method for precise measurements. The results of measurements on water in the temperature range 6 °C-45 °C are presented. The determination of all five parameters of the Debye function is possible. Finally, accuracy limiting factors for the determination of the relaxation parameters are discussed in detail.

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“…The dielectric constant of seawater is a function of the temperature and salinity. When the salinity is constant, the dielectric constant of seawater and the temperature are negatively correlated, but the effect is very limited [40]. Therefore, in theory, the higher the SST is, the smaller the seawater dielectric constant, and backscattering coefficient are; On the other hand, the roughness of the sea surface reflects the degree of scattering in the radiated area.…”

Section: Discussionmentioning

confidence: 99%

A Modeling Study of the Impact of the Sea Surface Temperature on the Backscattering Coefficient and Wind Field Retrieval

et al. 2020

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The sea surface temperature (SST) actively impacts the backscattering coefficient measured by scatterometers and the wind retrieval accuracy. However, none of the geophysical model functions (GMFs) currently used in operational wind retrieval considers the effect of the SST. With the HY-2A scatterometer as the research subject, this paper attempts to quantitatively analyze the effect of the SST on the backscattering coefficient for the first time and establish a new GMF by the Fourier series method (containing only cosine terms), which adopts the SST as the independent variable. The collocated Level 2A radar backscatter measurement data of the HY-2A scatterometer and the European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis wind data are used to build the new SST-dependent GMF that considers the influence of the SST in the model. The study indicates that the SST effects are wind speed dependent and more significant under vertical-vertical (VV) polarization. The backscattering coefficient increases with increasing SST in the wind speed range of 5-15 m/s. In addition, with increasing wind speed, the influence of the SST gradually decreases. Finally, the new GMF was applied to retrieve the ocean surface wind, which was compared to the conventional GMF to validate its performance. The experimental results indicate that the accuracy of wind field retrieval by the new GMF is considerably improved and the systematic deviation in the wind speed is effectively corrected. This study potentially contributes to a better understanding of the microwave backscattering behavior of the ocean surface and provides a way to further improve the wind retrieval accuracy of the HY-2A scatterometer as well as of other Ku-band scatterometers. INDEX TERMS Fourier series, geophysical model function (GMF), wind field retrieval, SST.

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Complex permittivity measurements at 8 6 mm wavelength over the temperature range 1-60 C

Cited by 39 publications

References 21 publications

Dielectric spectroscopy and micellization of aqueous solutions p-isononylphenoloxyethyleneglycolether

Dielectric spectroscopy and micellization of aqueous solutions p-isononylphenoloxyethyleneglycolether

High Precision Measurements of the Permittivity of Water in the Microwave Range

A Modeling Study of the Impact of the Sea Surface Temperature on the Backscattering Coefficient and Wind Field Retrieval

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