Applications of FFT and DFT in amplitude-frequency characteristic test of seismic data recorders
Li Caihua
Teng Yuntian
Zhang Yang
Hu Xingxing
Abstract：During the process of amplitude-frequency characteristic test of seis-mic 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 a DFT (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.
Keywords：seismic instrumentquality inspectionstandardizationseismic da-ta recorderamplitude-frequency characteristic
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 956-963 )