Frequency Spectrum Analysis of Ultrasonic Testing Signal in Concreteby Wei-Du Li, Tong-ji Univ, Shanghai, China,
Abstract: Description is given on high-speed sample apparatus connected with the CTS-25 low frequency ultrasonoscope and computer, the time domain of ultrasonic testing signal is transformed to the frequency domain by way of Fast Fourier Transform. Study of frequency spectrum analysis has been carried out for compact concrete, loose concrete and concrete with voids.
Subject Headings: Ultrasonic methods | Frequency analysis | Concrete | Material tests | Fourier analysis | Voids | Equipment and machinery | Computing in civil engineering
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