Optical fiber sensing technology is gradually replacing the traditional ultrasonic monitoring sensors. In this paper, we proposed an ultrasonic nondestructive testing (NDT) method based on frequency modulated continuous wave (FMCW). It had been demonstrated that this method was capable of detecting the ultrasonic wave with a center frequency of 130kHz emitted by piezoelectric ceramic sheets, and a signal-to-noise ratio of ~15dB had been obtained on a nondestructive aluminum plate. When the system was applied to the aluminum plate with cracks of different lengths, the amplitude of the acoustic signal changed, which proved the possibility of the system for ultrasonic NDT in metal plates.
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