Imaging beyond the Born approximation: An experimental investigation with an ultrasonic ring array

Details Imaging beyond the Born approximation: An experimental investigation with an ultrasonic ring array Imaging beyond the Born approximation: An experimental investigation with an ultrasonic ring array

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phrve..76c6601s&link_type=abstract

Physical Review E, vol. 76, Issue 3, id. 036601

Physics

2

Imaging And Optical Processing, Acoustic Signal Processing, Image Processing

Scientific paper

The classical diffraction limit excludes the possibility of resolving features of an object which are spaced less than half a wavelength apart when scattering experiments are performed from the far field. However, recently it has been shown that this limit could be a consequence of the Born approximation that neglects the distortion of the probing wave as it travels through the object to be imaged. Such a distortion, which is due to the multiple scattering phenomenon, can encode unlimited resolution in the radiating component of the scattered field thus leading to super resolution. In this context, a resolution better than λ /3 has been reported in the case of elastic wave probing [F. Simonetti, Phys. Rev. E 73, 036619 (2006)], λ being the wavelength of the wave illuminating the object. This paper demonstrates a resolution better than λ/4 and approaching λ/6 for objects immersed in a water bath probed by means of a ring transducer array that excites and detects ultrasonic pressure waves in a full view configuration. This is achieved despite the presence of a high level of noise in the measurements (the signal to noise ratio was below 0dB ). Moreover, while previous papers have provided experimental evidence of super resolution for objects small compared to the wavelength, here the case of extended objects is also investigated.

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