On permittivity measurement by a resonance method

This paper proposes a matter of permittivity measurement method which based on the microwave antennas resonant characteristics. The basic principle of measuring permittivity was analyzed by the antenna resonance theory. The simulation model has been build and analyzed by Ansoft HFSS simulation software. The relationship between different permittivity and the antennas resonant frequency was given. The experimental model was designed and the experimental data of sample was measured. The experimental and simulation data are compared and discussed. Results show that the simulation and experimental results are consistent well; the antenna resonance method to measure the permittivity is feasible.

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Microwave resonance method for measuring microliter volumes of free moisture in aviation fuels

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2020-3-49-56 ◽

2020 ◽

pp. 49-56

Author(s):

Vitaly V. Volkov ◽

Michael A. Suslin ◽

Jamil U. Dumbolov

Keyword(s):

Solid Surface ◽

Free Water ◽

Resonance Method ◽

Cavity Resonator ◽

Maximum Error ◽

Aviation Fuel ◽

Fuel Quality ◽

Microwave Resonance ◽

Free Moisture ◽

Microwave Losses

One of the conditions for ensuring the safety of air transport operation is the quality of aviation fuel refueled in aircraft. Fuel quality control is a multi-parameter task that includes monitoring the free moisture content. Regulatory documents establish the content of free water no more than 0.0015% by weight. It is developed a direct electrometric microwave resonance method for controlling free moisture in aviation fuels, which consists in changing the shape of the water drops by pressing them on a solid surface inside a cylindrical cavity resonator. This can dramatically increase dielectric losses. Analytical and experimental analysis of the proposed method is carried out. The control range from 0,5 to 30 μl of absolute volume of moisture in aviation fuels with a maximum error of not morethan 25 % is justified. The sensitivity of the proposed method for monitoring microwave losses in free moisture drops transformed into a thin layer by pressing is an order of magnitude greater than the sensitivity of the method for monitoring microwave losses in moisture drops on a solid surface in a resonator. The proposed method can be used as a basis for the development of devices for monitoring the free moisture of aviation fuels in the conditions of the airfield and laboratory. The direction of development of the method is shown.

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Comparison of sensitivity of the refractometric methods of frustrated total internal reflection and surface plasmon resonance

Izmeritel`naya Tekhnika ◽

10.32446/0369-1025it.2020-2-44-49 ◽

2020 ◽

pp. 44-49

Author(s):

I. N. Pavlov

Keyword(s):

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Total Internal Reflection ◽

Resonance Method ◽

Internal Reflection ◽

Optical Methods ◽

Thin Boundary Layer ◽

Experimental Conditions ◽

Frustrated Total Internal Reflection

Two optical methods, namely surface plasmon resonance imaging and frustrated total internal reflection, are described in the paper in terms of comparing their sensitivity to change of refractive index of a thin boundary layer of an investigated medium. It is shown that, despite the fact that the theoretically calculated sensitivity is higher for the frustrated total internal reflection method, and the fact that usually in practice the surface plasmon resonance method, on the contrary, is considered more sensitive, under the same experimental conditions both methods show a similar result.

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