線形化逆散乱解析の高速化と欠陥形状再生への適用

抄録

The principal operation of linearized inverse scattering method for the shape reconstruction of defects is the integration of the scattering amplitude in the K-space, which consists of the wave number and observation angle. In this study, the two dimensional fast Fourier transform is introduced into the inversion algorithm to evaluate the integration in the
K-space. In the process of the 2-DD FFT, the scattering amplitude is rearranged in the K-space to take account of the Nyquist wave number. Here, the backscattered waveforms measured with the contacttype of piezo-electric transducer are fed into the fast inverse technique. It is shown that the computational time of the inversion is improved without loss of the image resolution.