Analysis of detection methods of RF vibrometer for complex motion measurement

Yan Yan, Louis Cattafesta, Changzhi Li, Jenshan Lin

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

In this paper, the detection technique of the previously reported wavelength-division-sensing RF vibrometer is thoroughly analyzed by investigating the Bessel function coefficient of harmonics in the baseband spectrum. The analysis provides guidelines on the selection of harmonic pairs to help improve detection accuracy and reliability. A new detection method that utilizes multiple harmonic pairs under a fixed carrier frequency proves to be a more reliable approach for RF vibrometers. The sensitivity of harmonic amplitude ratio to the excess phase angle is explored as well. The results show that by using insensitive harmonic pairs, information about the characteristics of the vibration system and the external driving force are still attainable even when the phase angles are unknown. Real-time monitoring of various harmonic vibrations has been realized through a LabVIEW program with a user interface that provides visualization of the vibration patterns. The function of through-wall detection of the RF vibrometer has also been verified by conducting all measurements behind a wall with a detection distance of 1.5 m.

Original languageEnglish
Article number6069598
Pages (from-to)3556-3566
Number of pages11
JournalIEEE Transactions on Microwave Theory and Techniques
Volume59
Issue number12 PART 2
DOIs
StatePublished - Dec 2011

Keywords

  • Bessel function
  • Doppler radar
  • harmonically excited vibration
  • harmonics
  • real time
  • sensitivity
  • through-wall detection

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