Conclusion
In this paper, we have exposed a solution to improve the resolution in Low Frequency Ultrasonic Tomography. Since the basic principle of ultrasonic reflection tomography prohibits the inspection of objects with strong contrast and large extension, we turn down the frequency of the transducer, in order to increase the penetration length of the wave and the validity of the method. But this is done at the expense of resolution.
To restore resolution, we proposed a signal processing method based on Papoulis deconvolution. We implemented this algorithm and tried to operate an improvement from an aluminum rod smaller than the wavelength.
The result is an imagery with the same quality as that given by a more high frequency method.
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Internet address of the Laboratory (http://alphalma.cnrs-mrs.fr/pi/api.html)
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© 2002 Kluwer Academic Publishers
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Lasaygues, P., Lefebvre, J., Bouvat-Merlin, M. (2002). High-Resolution Process in Ultrasonic Reflection Tomography. In: Lee, H. (eds) Acoustical Imaging. Acoustical Imaging, vol 24. Springer, Boston, MA. https://doi.org/10.1007/0-306-47108-6_5
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DOI: https://doi.org/10.1007/0-306-47108-6_5
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