Mesure de la permittivité diélectrique de liquides en ondes décimétriques

Cachet, H.; Lestrade, Jean-Claude; Epelboin, I.

doi:10.1051/jcp/1965620808

Cited by 16 publications

(21 citation statements)

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“…Another example is the shielded open-ended sensor which essentially consists of a coaxial-line/circular waveguide transition, the liquid-filled waveguide being excited below the cut-off frequency of its TM 01 mode [27][28][29][30][31][32]. Flux lines passing the dielectric window that seals the sample cell necessitate a more complex equivalent network with two additional capacitances ( [32], figure 3).…”

Section: Concepts Of Calibration Methods For Microwave Dielectric Sen...mentioning

confidence: 99%

Reference liquids for the calibration of dielectric sensors and measurement instruments

Kaatze¹

2007

Meas. Sci. Technol.

147

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A comparative study of microwave complex dielectric permittivity data from different laboratories is provided for liquids. Four liquids—water, cyclohexane, methanol and dimethyl sulphoxide—are recommended as reference materials because their parameter sets from different measurements result in almost identical predictions of their dielectric properties in the frequency range up to 10 GHz. Within the limits of experimental error this agreement includes that of the extrapolated low frequency permittivity with the recently determined static permittivity of the liquids. Parameters for water are given for the frequency range 0–60 °C. For cyclohexane, which does not display relaxation behaviour up to the submillimetre frequency range, the frequency-independent permittivity is represented between 10 and 50 °C. Relaxation and static permittivity data for methanol and dimethyl sulphoxide are presented at 25 °C.

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Section: Concepts Of Calibration Methods For Microwave Dielectric Sen...mentioning

confidence: 99%

Reference liquids for the calibration of dielectric sensors and measurement instruments

Kaatze¹

2007

Meas. Sci. Technol.

147

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“…Originally the shielded circular-to-cylindrical waveguide transition depicted in part c of Figure 35 has been designed in order to allow for simultaneous dc conductivity and complex permittivity measurement of electrolyte solutions by inserting conductivity electrodes in the circular waveguide section [230]. The advantage of such a mode of operation is assurance of identical temperature for both parameters, enabling a superior determination of the dielectric contribution to ′′ to εtot from Eq.…”

Section: Reflection Techniques Open-ended Coaxial Line Probementioning

confidence: 99%

“…(31). If adequately arranged the conductivity electrodes do not disturb the electromagnetic field of the permittivity measurements because the circular waveguide is excited well below the cut-off frequency of its TM01 mode when filled with the liquid [192,[230][231][232][233]. The rapidly decreasing evanescent field excited in the circular waveguide section implicates, in addition, the need for sample volumes on the order of 1 cm 3 only and also independency of exact filling level as well as the shape of the liquid meniscus.…”

Section: Reflection Techniques Open-ended Coaxial Line Probementioning

confidence: 99%

Electromagnetic moisture measurement

Hübner¹,

Kaatze²

2016

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XII which we believe to be useful when considering the design of special sensors and appropriate measurement techniques for moisture determination. A chapter dealing with the dielectric properties of water in its different states of interaction is also included. It is intended to provide information concerning the adequate modelling of data derived from the electromagnetic signals when affected by moist materials. Selected applications are discussed in order to introduce some proven examples of electromagnetic moisture sensors and related measurement methods. Finally, a collection of dielectric data for liquids is presented which may serve as reference in calibration procedures. Preferably data obtained from calibration-free methods is given. Additionally, most of it has been measured at different laboratories and the different series of data agree within the limits of experimental uncertainty. A detailed bibliography is provided in order to assist with further reading. We are indebted to Alexander Brandelik, Karlsruhe, who spent much time to critically read the manuscript before publication. We thank Alexander Schaub, Mannheim, for valuable help with editing the book, including proofreading and formatting.

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“…Coaxial-to-circular waveguide transitions have been used for a long time in both frequency domain and time domain measurements at small sample volume [113][114][115][116]. Only recently, however, the simple lumped element representation of such cells has been verified by calculating its input admittance from a mode matching technique [111].…”

Section: Sample Cellsmentioning

confidence: 99%

Broadband dielectric spectrometry of liquids and biosystems

Kaatze¹,

Feldman²

2005

Meas. Sci. Technol.

165

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This review provides a short introduction into the basic principles of dielectric spectroscopy and it covers modern methods in use to measure the dielectric properties of liquid samples over the frequency range from about 10−6 Hz to 1012 Hz. The approaches described include frequency domain and time domain techniques, low frequency, high frequency and microwave measurement systems, as well as broadband and spot-frequency modes of operation. Reflection, transmission and resonant methods are presented, sketches of suitable sensors and block diagrams of measurement set-ups are shown. Accuracy aspects and the merits and limitations of the different techniques of measurement are discussed.

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Mesure de la permittivité diélectrique de liquides en ondes décimétriques

Cited by 16 publications

References 0 publications

Reference liquids for the calibration of dielectric sensors and measurement instruments

Reference liquids for the calibration of dielectric sensors and measurement instruments

Electromagnetic moisture measurement

Broadband dielectric spectrometry of liquids and biosystems

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