Microwave imaging of multilayered structures using ultrawideband noise signals

Marc D. Navagato, Ram Mohan Narayanan

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A microwave ultrawideband (UWB) radar system is developed and used for non-destructive testing (NDT) of multilayered structures. The effectiveness of this approach lies in the choice of critical parameters such as waveform type, operational frequency range, and stand-off distance. Matched filtering of the received waveform with a replica of the transmitted signal is used to locate hidden anomalies or flaws within a multilayered structure, most of which are not apparent through common visual-inspection techniques. Due to the impulse-like autocorrelation properties of white noise, noise waveforms provide the ability to locate material discontinuities as well as, or better than, other common waveforms such as Gaussian-modulated sinusoidal pulses (GMSP) or linearly frequency modulated chirp signals. Experimental data are gathered using a specially developed microwave imaging system which operates in the X-band frequency range. Subsequently, two-dimensional (2-D) and three-dimensional (3-D) images are rendered following a raster scanning approach to reveal internal boundaries, hidden inclusions, and defects due to impact damages or corrosion in fiber-reinforced polymer (FRP) materials and other dielectric materials.

Original languageEnglish (US)
Pages (from-to)19-33
Number of pages15
JournalNDT and E International
Volume104
DOIs
StatePublished - Jun 1 2019

Fingerprint

Ultra-wideband (UWB)
waveforms
Microwaves
Imaging techniques
microwaves
Defects
White noise
Radar systems
Nondestructive examination
Autocorrelation
Imaging systems
Frequency bands
Polymers
Inspection
frequency ranges
chirp signals
raster scanning
Corrosion
impact damage
Scanning

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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Microwave imaging of multilayered structures using ultrawideband noise signals. / Navagato, Marc D.; Narayanan, Ram Mohan.

In: NDT and E International, Vol. 104, 01.06.2019, p. 19-33.

Research output: Contribution to journalArticle

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