PubMed Health⌕ Search

Biomedical subjects

G Roussy

Publications and source records attributed to G Roussy.

6 recordsLinked to original sources
PubMed2002

Reference phase-shifter for measuring high power microwave impedance by using a phase modulation method.

A basic mechanical phase-shifter is described and proposed for use as a reference circuit for impedance measurements with a phase modulation method. It consists of a section of a curved rectangular waveguide, the length of which is mechanically varied with a stepper motor. The phase-shifter functions without gears. It can be used successfully in industrial set-ups with a pulsed or CW generator which are of low stability in frequency and in amplitude.

Journal Article↗
PubMed2001

A flexible RF applicator for heating viscous lossy products such as foods.

A helical RF industrial applicator was evaluated for heating minced meat flowing in a hollow tube. Heating was homogeneous inside the product, although the product was highly lossy due to its high electric conductivity. The homogeneity was much better than could be obtained with microwave heating. A high power density, up to 5 kW/liter, can be deposited inside the product with 95% efficiency.

Computer-Aided Design↗
PubMed2001

Derivation of an explicit formula for determining the effective permittivity of a three-component composite.

The author extends the Bergman-Milton formula of the effective permittivity of a two-component heterogeneous dielectric mixture to the case of a three-component mixture. He validates the introduction of a unique two-variable density function which describes the microgeometry. He also supplements the theoretical approach by discussing the significance and the forms of the percolation terms. The geometrical density functions, which correspond to the well-known Lichtnecker, C.R.I.M. and Looyenga formulae are explicitly given as cases for illustrating the general approach.

Complex Mixtures↗
PubMed2001

Look at European RF industrial applications.

The authors review the European RF industrial applications. European RF technology produced the 50omega-technology, which has been the basis for many successful applications in classical industrial domains such as food tempering and defrosting, rubber curing but also in new domains such as RF for curing of many car products. These new applications make clear the fundamental advantage of fast processing with RF technology.

Amplifiers, Electronic↗
PubMed2000

Improving electric field distribution in a microwave heating device.

The authors describe a microwave reheater for food products in which two magnetrons and a magic tee are used for decoupling the waves emitted and for obtaining good impedance matching. Symmetric and asymmetric parts of the electric field pattern can be separately adjusted and optimized for best results.

Food↗