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Fourier amplitude of a frequency spectrum depends on the value of Nfft. If we take Nfft as 1024, the Fourier amplitude of fundamental frequency is 22.7 and if we take Nfft as 100000, it is 50.9....
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What is the optimum value of Nfft for getting FFT spectrum for an ultrasonic signal having the sampling frequency of 2000 kHz obtained using probes of 54 kHz frequencies ?
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In some of the ultrasonic nondestructive damage evaluation of solids, why receiving probes having twice the frequency of transmitting probes are used ? What will be the drawback if both the probes...
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