Results 261 to 270 of about 21,537 (304)

Techniques and applications of permittivity measurements

Proceedings of Conference on Electrical Insulation and Dielectric Phenomena - CEIDP '96, 2002
The introduction of a fundamentally new microwave measurement technology has provided the petroleum, food and chemical processing industries with a method of real time, full stream process monitoring. This technology, known as oscillator load pull, is based on detecting changes in the permittivity of the materials being examined.
D.M. Slaten, B.N. Scott, L.B. Gordon
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Broadband measurements of permittivity and permeability

1983 Eighth International Conference on Infrared and Millimeter Waves, 1983
Theory and system designs from multiple band measurements of permittivity and permeability will be presented. Measured data will be presented for various microwave absorbers from 5–100 GHz. An analysis of system errors is also presented.
R. L. Moore, J. P. Montgomery, T. B. Wells   +2 more
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New permittivity measurements of seawater

Radio Science, 1998
We have measured the permittivity of representative samples of natural seawater, synthetic seawater, and aqueous NaCl solutions over the frequency range 3–20 GHz, in 0.1‐GHz steps and over the temperature range −2°–30°C in 1° steps. Additional measurements have been made at spot frequencies (23.8, 36.5, and 89 GHz) and at selected temperatures between −
W. Ellison, A. Balana, G. Delbos, K. Lamkaouchi, L. Eymard, C. Guillou, C. Prigent   +6 more
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On permittivity measurement by a resonance method

Radiophysics and Quantum Electronics, 1996
In a quasioptical approximation we develop a theory of an open cavity with a dielectric plate placed normally to the cavity axis. We find conditions under which some natural frequencies of the cavity are practically independent of the plate position in the cavity.
S. N. Vlasov, E. V. Koposova, A. B. Mazur, V. V. Parshin   +3 more
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A spectrometer for the measurement of complex permittivity

Journal of Physics E: Scientific Instruments, 1972
The spectrometer uses an unbalanced AC bridge and records the real or imaginary component of permittivity on a chart recorder over the frequency range from about 1 Hz to 1 MHz. The measured sensitivity extends to values of loss tangent of about 10-3 although the ultimate sensitivity is expected to be higher.
I R Edmonds, M J A Smith
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New Permittivity Measurement Methods Using Resonant Phenomena For High-Permittivity Materials

IEEE Transactions on Instrumentation and Measurement, 2017
This paper describes the characterization of high-permittivity materials with a dielectric constant ( $\epsilon _{r}$ ) up to 3000 using resonant phenomena. We propose and demonstrate two types of measurement techniques: the rectangular resonator method by controlling the sample insertion length and the waveguide reflection method with a sample ...
Yuto Kato, Masahiro Horibe
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A modified calibration method for complex permittivity measurement

Review of Scientific Instruments, 2013
This work proposes a calibration method to determine the complex permittivity of materials based on the cavity-perturbation method. The method can characterize a sample with relative large in volume or high in dielectric constant, which significantly broadens the scope of the conventional perturbation method.
Hsein-Win, Chao, Tsun-Hsu, Chang
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An ultra-wideband measurement method of rock permittivity

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017
Electrical properties of sediment rocks is essential to the data interpretation of electrical and electromagnetic logging. An optimized ultra-wideband parallel-plate capacitor device is proposed to achieve the electrical parameters measurement. The validity and accuracy of the proposed measurement system is verified by experimental results. The results
Chen Guo 0002, Hang Dong, Gary Mavko, Richard C. Liu   +3 more
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Measurement of Complex Permittivity and Permeability

1970
Abstract : The program was conducted to derive a better technique for the measurement of the permeability and permittivity of lossy ferrites at microwave frequencies at temperatures up to 1000F. Although the classical method of waveguide measurement techniques was used, a careful analysis of the sources of errors was undertaken and a computer aided ...
Eva M. Thomas, Abdelnour S. Thomas
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The Measurement of Permittivity and Temperature of Tissues

1984
There is at present much interest in the use of microwave induced hyperthermia.1 For most applications it is desirable to measure the temperature of the phantom tissue or animal being irradiated without the thermometer interacting with the microwave field.
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