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Motion sensing by microwave interferometry using two electric probes | IEEE Conference Publication | IEEE Xplore

Motion sensing by microwave interferometry using two electric probes


Abstract:

This paper addresses the possibility of displacement measurement by microwave interferometry at an unknown reflection coefficient with the use of two electric probes moun...Show More

Abstract:

This paper addresses the possibility of displacement measurement by microwave interferometry at an unknown reflection coefficient with the use of two electric probes mounted in a waveguide section. The aim of this paper is to show that the displacement measurement accuracy can be improved by using an interprobe distance other than its conventional value. The measurement error as a function of the interprobe distance is analyzed with the inclusion of variations of the currents of the semiconductor detectors connected to the probes from their theoretical values. Based on the results of this analysis, the interprobe distance is suggested to be one tenth of the guided operating wavelength. In comparison with the conventional interprobe distance, its suggested value offers a marked reduction in the measurement error for reflection coefficients close to unity, while for smaller ones this error remains much the same.
Date of Conference: 10-14 October 2016
Date Added to IEEE Xplore: 24 November 2016
ISBN Information:
Conference Location: Kharkiv, Ukraine

I. Introduction

Microwave interferometry is an ideal means for displacement measurement in various engineering applications. This is due to its ability to provide fast noncontact measurements, applicability to dusty or smoky environments (as distinct from laser Doppler sensors or vision-based systems using digital image processing techniques), and simple hardware implementation. In microwave interferometry, the displacement of the object under measurement (target) is extracted from the phase shift between the signal reflected from the target and the reference signal. At present, this phase shift is usually determined using special hardware incorporating a power divider and a phase-detecting processor, which is an analog [1] or a digital [2] quadrature mixer. In doing so, measures have to be taken to minimize the nonlinear phase response of the quadrature mixer, which is caused by its phase and amplitude unbalances.

References

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