EXPERIMENTAL VERIFICATION OF A TWO-PROBE IMPLEMETRATION OF MICROWAVE INTERFEROMETRY FOR DISPLACEMENT MEASUREMENT
Journal Title: Технічна механіка, Техническая механика, Technical Mechanics - Year 2018, Vol 1, Issue 1
Abstract
This paper addresses the problem of experimental verification of a recently proposed two-probe method for displacement measurement based on microwave interferometry. The aim of this paper is to develop a technique that would allow one to verify that method by comparing the measured displacement vs. time relationship of a moving target with the actual one without recourse to complex photorecording equipment. This aim is achieved by the target being put in motion using a crank mechanism so that the actual target displacement can be calculat-ed from the crank radius and arm length, the crank rotation period, and the crank angle at the initial time. The experiments described in this paper have verified the above-mentioned two-probe displacement measurement method, thus confirming that the displacement can be determined from probe measurements at an unknown reflection coefficient using as few as two probes. At an operating wavelength of 3 cm, a target double amplitude of 10 cm and 15 cm, and a target vibration frequency of about 2 Hz, the method allows one to determine the instantaneous target displacement with a maximum error of about 3 mm and an average error of about 1 mm without any preprocessing of the measured data, such as filtering, smoothing, etc. In comparison with conventional three-probe measurements, the reduction in the number of probes simplifies the design and manufacture of the measuring waveguide section and alleviates the problem of interprobe interference. The simple hardware implementation of the above-mentioned displacement measurement method allows one to use it in the development of motion sensors to measure the displacement of space debris objects onboard a dedicated spacecraft for space debris removal.
Authors and Affiliations
O. Pylypenko, A. Doronin, N. Gorev, I. Kodzhespirova
Keywords
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