Microwave device for the continuous measurement of the viscosity

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters

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324632, 324637, G01R 2704, G01N 2200

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active

050599143

ABSTRACT:
Microwave device for the continuous measurement of the viscosity of a viscous medium. The device includes a microwave source connected via a microwave guide to a sensor essentially incorporating at least one semi-rigid, coaxial microwave guide (2) for immersion in the medium. The cable has an outer sheath (4) and a core (6), which conduct electricity and are arranged coaxially. The space defined between the outer sheath and the core is filled by a dielectric (8). The core has a bare end (12) for placing in contact with the viscous medium. The sensor is intended to produce in the medium incident microwaves of a given power level, and to detect the power of the microwaves reflected by the medium. A second microwave guide (10) is provided for coupling the detector to the sensor.

REFERENCES:
patent: 3701943 (1972-10-01), Kaiser
patent: 3851244 (1974-11-01), Mounce
patent: 4544880 (1985-10-01), Nagy et al.
patent: 4786857 (1988-11-01), Mohr et al.
patent: 4912971 (1990-04-01), Jeambey
IEE Transactions on Instrumentation and Measurement, vol. IM-34, No. 3, Sep. 1985, pp. 417-421, New York, U.S.A.; M. Martinelli et al.: "A Method for Dynamic Dielectric Measurements at Microwave Frequencies: Applications to Polymerization Process Studies", *pp. 417-419; FIG. 1, 3*.
Physics in Medicine & Biology, vol. 31, No. 9, Sep. 1986, pp. 1031-1040, London, GB; S. Ray et al.: "Microwave Absorption in Lossy Liquids", *pp. 1034, 1035; FIG. 1*.
Journal of Physics E/Scientific Instruments, vol. 20, No. 7, Jul. 1987, pp. 872-877, Bristol, GB; M. C. Steel et al.: "Precision Waveguide Cells for the Measurement of Complex Permittivity of Lossy Liquids and Biological Tissue at 35 GHz", *pp. 873, 874; FIG. 1, 2*.
Review of Scientific Instruments, vol. 52, May 1981, pp. 767-769, New York, U.S.A.; K. K. S. Jamwal et al.: "Simple and Fast Technique for Measuring Dielectric Constant of Polymers at Microwave Frequencies", *FIG. 2*.

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