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Frequency Analysis and Interpolated Spectra of Time-Limited Samples in 3D RF Imaging

[+] Author Affiliations
HyungTae Kim, KyungChan Jin, SeungTaek Kim

KITECH, CheonAn, ChungNam, South Korea

Paper No. IMECE2014-36576, pp. V04BT04A010; 2 pages
doi:10.1115/IMECE2014-36576
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 4B: Dynamics, Vibration, and Control
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4648-3
  • Copyright © 2014 by ASME

abstract

Fast Fourier Transform (FFT) calculates integer harmonic components, but ignores other frequency components such as non-integer harmonics and non-harmonics. In a practical sampling problem, the length of a sampled signal is finite and the sampling time is minimized. Therefore, it is necessary for interpolation to improve the accuracy of frequency analysis considering 1/m harmonic components and zero-padding (ZP) technique. The proposed method was applied to a 3D RF profile measurement system and the resolution was improved to 1/m.

Copyright © 2014 by ASME

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