Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

The dielectric permittivity of soils of different textures as a function of moisture level (10-30% by volume) and frequency (0.6 and 1.2 GHz) using co-axial cable method is determined. This technique can be used to estimate the dielectric constant over a wide range of frequency using a single probe. Estimated values of dielectric permittivity (ε′) were calculated for wet soil by using a mixing model and found to be in reasonable agreement with the experimental data. Complex part of permittivity (ε″) also shows an increase with moisture content. The increase, however, varies among different soil samples because of texture variation. Relaxation frequency and spread of relaxation were also calculated for all samples under dry and wet conditions. This study can be used for texture characterisation under dry and wet conditions.

Department of Sensor and Biomedical Technology

School of Electronics Engineering

Vellore Campus

World University root node

Indian Journal of Pure and Applied Physics

Complex dielectric permittivity of soil as a function of frequency, moisture and texture

The accurate knowledge of complex dielectric behavior of biological tissues at microwave frequency is of great importance in the biomedical field for its diagnostic and therapeutic uses. This information is also essential for studying the mechanism underlying the absorption of electromagnetic energy and also the emission by tissues. In the present work, in vitro complex dielectric permittivity of liver and muscle were measured in the frequency range 0.6 GHz to 1.2 GHz using a network analyzer. An open ended coaxial cable method was used and the complex dielectric permittivity was measured from the actual terminal admittance of the sample. The system was calibrated with three standard samples. The measurements were conducted at room temperature. The calculated values of E' varied from 53 to 48 for liver and from 49 to 46 for muscle. The corresponding E' varied from 29 to 38 and 30 to 34 respectively. The relaxation frequency and degree of dispersion were also calculated and estimation of bound water content made in each case.

Proceedings of SPIE - The International Society for Optical Engineering

Dielectric permittivity of biological tissues in the microwave frequency range

A new pulsed radio frequency electric field pattern evolved from bone studies was adopted to accelerate fracture healing in rats. The output of a specially designed signal generator was ca-pacitatively coupled to the fracture site using a pair of stainless steel electrodes. In a series of experiments performed on rats, fractures were induced in the femoral shafts and electrical stimulations were applied to one leg. Bone mass formed in the gap was estimated by measurement of the cortical thickness and by ultrasonic attenuation. We found that the stimulated side showed greater bone mass than the contralateral control. We suggest that. this device offers a simple and reliable method of acclerated healing, immediately after fracture. © 1991 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.