Abstract
An algorithm for reconstructing images of reflectors from echo signals that propagate in a test object, which consists of several regions with different acoustic properties, is considered. The ray trajectories are calculated using the method of direct construction of the family of rays that escape from the point where a transmitter is located but not the Fermat variational principle. After the family of rays is constructed, their belonging to a certain acoustic scheme can be analyzed and the approximation of the calculated delays on the spatial mesh of the image reconstruction region (IRR) can be performed. This will allow the reconstruction of both the pulse travel time from the transmitter to any point in the IRR and back to the receiver and the attenuation of the pulse amplitude caused by the divergence, reflection, and refraction effects at the boundaries of the regions that constitute the test object. Numerical and model experiments show the working capacity of the proposed algorithm for reconstructing reflector images.
Similar content being viewed by others
References
Burov, V.A. and Shmelev, A.A., Numerical and physical modeling of the tomography process based of third-order nonlinear acoustic effects, Acoust. Phys., 2009, vol. 55, no. 4–5, pp. 482–495.
Born, M. and Wolf, E., Principles of Optics, New York: Pergamon, 1980.
Bazulin, E.G., Obtaining flaw images by the SAFT method taking the variable velocity of sound in a test object into account, Russ. J. Nondestr. Test., 2010, no. 11, pp. 789–797.
Connolly, G.D., Modelling of the Propagation of Ultrasound through Austenitic Steel Welds, UK Research Centre in NDE (RCNDE), Department of Mechanical Engineering Imperial College, London, SW7 2AZ, 2009.
NVIDIA CUDATM. http://www.nvidia.ru/object/cuda-what-is-ru.htmlCUDA
Bazulin, E.G., On the possibility of using the maximum entropy method in ultrasonic nondestructive testing for scatterer visualization from a set of echo signals, Acoust. Phys., 2013, vol. 59, no. 2, pp. 210–227.
Samokrutov, A.A. and Shevaldykin, V.G., On the possibility of evaluating the metal-discontinuity character using an ultrasonic tomograph with digital focusing of the antenna array, Kontr. Diagnost., 2011, no. 10, p. 63.
Chatillon, S., Fidahoussen, A., Iakovleva, E., and Calmon, P., Time of flight inverse matching reconstruction of ultrasonic array data exploiting forwards models, NDT in Canada 2009, National Conf., 2009.
Borovikov, V.A. and Kinberg, B.E., Geometricheskaya teoriya difraktsii (Geometrical Theory of Diffraction), Moscow: Svyaz’, 1978.
Kravtsev, Yu.A. and Orlov, Yu.I., Geometricheskaya optika neodnorodnykh sred (Geometrical Optics of Inhomogeneous Media), Moscow: Nauka, 1980.
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © E.G. Bazulin, 2014, published in Defektoskopiya, 2014, Vol. 50, No. 9, pp. 22–40.
Rights and permissions
About this article
Cite this article
Bazulin, E.G. Reconstruction of images of reflectors using the correlation method at an arbitrary number of reflections of an ultrasonic pulse from the boundary of a test object that consists of regions with different acoustic properties. Russ J Nondestruct Test 50, 515–530 (2014). https://doi.org/10.1134/S1061830914090022
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1061830914090022