CAJ | 학술논문

在进行地震数据采集器的幅频特性测试中，当标定信号频率稍高时（约为采集器采样率1/5以上），采集器输出的正弦波形发生畸变，无法人工读取正弦波峰值。为了解决该问题，本文提出了基于离散傅里叶变换（DFT ）的积分恢复算法，将该方法与快速傅里叶变化（FFT）谱分析方法同时应用于一台高精度地震数据采集器的幅频特性测试数据处理。结果表明这两种算法均能标准化、高精度地完成采集器幅频特性标定数据的计算。其中基于DFT的积分恢复算法的计算程序操作简单，能够高效率地完成数据采集器的幅频特性检定工作；并且该方法还可以应用于地震数据采集器的线性度测试。
재진행지진수거채집기적폭빈특성측시중，당표정신호빈솔초고시（약위채집기채양솔1/5이상），채집기수출적정현파형발생기변，무법인공독취정현파봉치。위료해결해문제，본문제출료기우리산부리협변환（DFT ）적적분회복산법，장해방법여쾌속부리협변화（FFT）보분석방법동시응용우일태고정도지진수거채집기적폭빈특성측시수거처리。결과표명저량충산법균능표준화、고정도지완성채집기폭빈특성표정수거적계산。기중기우DFT적적분회복산법적계산정서조작간단，능구고효솔지완성수거채집기적폭빈특성검정공작；병차해방법환가이응용우지진수거채집기적선성도측시。
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.