Abstract：
:The accurate estimation of time of flight (TOF) of an ultrasonic signal is essential in ultrasonic non-destructive testing (NDT). A novel method for TOF estimation based on the short-time Fourier transform (STFT) is proposed in this paper. Firstly, the time and frequency components of ultrasonic echoes are represented by a STFT. Then, the STFT spectrum of the echoes is projected onto the time domain. Finally, the TOF is estimated by calculating the location of the maximum modulus of STFT spectrum of the signal. A nonlinear Least Squares (LS) estimation method based on Modified Gauss-Newton (MGN) is employed to improve the estimation accuracy. The TOFs of multi-component echo signals are estimated by successive windowing. Numerical simulations and experiment tests show the performance of the proposed method.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Lu Z,Ma F,Yang C,Chang Mdoi
10.1016/j.ultras.2020.106104subject
Has Abstractpub_date
2020-04-01 00:00:00pages
106104eissn
0041-624Xissn
1874-9968pii
S0041-624X(20)30043-3journal_volume
103pub_type
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