Li Caihua, Teng Yuntian, Zhang Yang, Hu Xingxing. 2014: Applications of FFT and DFT in amplitude-frequency characteristic test of seismic data recorders. Acta Seismologica Sinica, 36(5): 956-963. DOI: 10.3969/j.issn.0253-3782.2014.05.018
Citation: Li Caihua, Teng Yuntian, Zhang Yang, Hu Xingxing. 2014: Applications of FFT and DFT in amplitude-frequency characteristic test of seismic data recorders. Acta Seismologica Sinica, 36(5): 956-963. DOI: 10.3969/j.issn.0253-3782.2014.05.018

Applications of FFT and DFT in amplitude-frequency characteristic test of seismic data recorders

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  • Received Date: October 27, 2013
  • Revised Date: March 02, 2014
  • Published Date: August 31, 2014
  • During the process of amplitude-frequency characteristic test of seismic data recorders, when the frequency of calibration signal reached one-fifth of the sampling frequency of seismic data recorder, we cannot manually get the peak-value of output sine-wave by seismic data recorder due to distortion of sine-waveforms. In order to solve this problem, this paper proposed aDFT(discrete Fourier transformation)-based numerical integration method. Then FFT (fast Fourier transformation) method and DFT numerical integration method were used to compute real amplitude-frequency characteristic test data of one high-precision seismic data recorder. The result shows that these two methods are high precision and standardization, and can compute the calibrating data of amplitude-frequency characteristic. Compared with FFT method, DFT-based numerical integration method is simple to operation. And it can also be applied to linearity test of seismic data recorders.
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