volume | PIER Journals

2013-04-11

A Way to Improve the Accuracy of Displacement Measurement by a Two-Probe Implementation of Microwave Interferometry

Aleksei V. Doronin,

Dr. Aleksei V. Doronin

Department for Functional Elements of Control Systems

National Academy of Sciences of Ukraine

Ukraine

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Nikolai B. Gorev,

Dr. Nikolai B. Gorev

Department for Functional Elements of Control Systems

Institute of Technical Mechanics

Ukraine

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Inna F. Kodzhespirova,

Dr. Inna F. Kodzhespirova

Department for Functional Elements of Control Systems

National Academy of Sciences of Ukraine

Ukraine

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Evgeny N. Privalov

Dr. Evgeny N. Privalov

Department for Functional Elements of Control Systems

National Academy of Sciences of Ukraine

Ukraine

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Progress In Electromagnetics Research M, Vol. 30, 105-116, 2013

doi:10.2528/PIERM13020504 | Google Scholar

Abstract

This paper addresses the possibility of displacement measurement by microwave interferometry at an unknown reflection coefficient with the use of as few as two probes. The case of an arbitrary interpobe distance is considered. The measurement error as a function of the interprobe distance is analyzed with the inclusion of variations of the detector currents from their theoretical values. The analysis has shown that as the interprobe distance decreases, the maximum measurement error passes through a minimum for reflection coefficients close to unity and increases monotonically for smaller reflection coefficients. Based on the results of the analysis, the interprobe distance is suggested to be one tenth of the guided operating wavelength λ_g. In comparison with the conventional interprobe distance of λ_g/8, the suggested one offers a marked reduction in the maximum measurement error for reflection coefficients close to unity, while for smaller ones this error remains much the same (for a detector current error of 3%, the maximum measurement error in percent of the operating wavelength is 2.2% and 1.0% at λ_g/10 as against 4.8% and 2.7% at λ_g/8 for a reflection coefficient of 1 and 0.9, respectively, and 2.9% at λ_g/10 as against 2.4% at λ_g/8 for a reflection coefficient of 0.1).

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Aleksei V. Doronin, Nikolai B. Gorev, Inna F. Kodzhespirova, and Evgeny N. Privalov, "A Way to Improve the Accuracy of Displacement Measurement by a Two-Probe Implementation of Microwave Interferometry," Progress In Electromagnetics Research M, Vol. 30, 105-116, 2013.
doi:10.2528/PIERM13020504

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