Ultrasonic imaging of an object at the presence of Fourier and non-Fourier transformation in the transmitted through the object acoustic field

Andreeva, A.; Burova, M.; Burov, J. I.

doi:10.1016/j.ultras.2007.01.008

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A Porosity Measurement Theory1

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“…Then it allows for implementation in the frequency domain via the Fast Fourier Transform (FFT). In order to obtain the reference signal and sample signal, the waves should propagate in the water and the sample [8][9][10]. And then the attenuation coefficient in frequency domain can calculate using (1).…”

Section: A Porosity Measurement Theorymentioning

confidence: 99%

Ultrasonic transmission method for testing curved composite parts

Wang

Pan

et al. 2012

2012 IEEE International Conference on Mechatronics and Automation

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In this paper, the detection of common defects such as inclusion, delamination for curved composite materials is studied. The principle of measuring porosity is focused on introducing. The technology of trajectory planning and motion control for twin-robot system of testing various curved composite parts using ultrasonic transmission method is also discussed. An ultrasonic NDT system is developed for testing large-scaled curved composite components used in aerospace and other fields. With many advantages, it will be very significant for our nondestructive testing work.

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Section: A Porosity Measurement Theorymentioning

confidence: 99%