提高地震仪器谐波畸变测试精度的方法
|
摘要
谐波畸变是地震勘探仪器的一项重要参数,其指标高低主要取决于采集通道的滤波器、前置放大器和模数转换器等模拟器件。谐波畸变测试信号的幅度、畸变、频率精度和稳定性以及对测试数据的处理算法等是影响谐波畸变测试精度的主要因素。在测试信号品质相同的情况下,选择合适的时间域计算窗口可以有效地提高谐波畸变的测试精度。本文从地震仪器采集通道的电路组成和谐波畸变的定义及测试原理出发,分析了测试信号属性和测试算法对谐波畸变测试精度的影响,探讨了提高地震仪器谐波畸变测试精度的方法。
The harmonic distortion is an important parameter for seismic prospecting instrument,its specifications mainly depend on the filter in acquisition channel,the preamplifier,the analog-to-digital converter and other analog devices. The amplitude,distortion,frequency accuracy,stability and the processing algorithm for the testing data are the major factors which affect the testing accuracy of the harmonic distortion. When the quality of the testing signal is the same,selection of suitable calculation window in time domain could effectively raise the testing accuracy for the harmonic distortion. Based on the circuit constitution of the acquisition channel of the seismic prospecting instrument,the definition of the harmonic distortion and the testing principles,the influence of the testing signal's attributes and the testing algorithm to the testing accuracy of the harmonic distortion was analyzed,and how to raise the testing accuracy of the harmonic distortion was discussed in this paper.
The harmonic distortion is an important parameter for seismic prospecting instrument,its specifications mainly depend on the filter in acquisition channel,the preamplifier,the analog-to-digital converter and other analog devices. The amplitude,distortion,frequency accuracy,stability and the processing algorithm for the testing data are the major factors which affect the testing accuracy of the harmonic distortion. When the quality of the testing signal is the same,selection of suitable calculation window in time domain could effectively raise the testing accuracy for the harmonic distortion. Based on the circuit constitution of the acquisition channel of the seismic prospecting instrument,the definition of the harmonic distortion and the testing principles,the influence of the testing signal's attributes and the testing algorithm to the testing accuracy of the harmonic distortion was analyzed,and how to raise the testing accuracy of the harmonic distortion was discussed in this paper.
引文
[1]Badger A S.Special report on digital seismic recorder specification standards by SEG Subcommittee on digit-al seismic recorder specifications.Geophysics,1988,53(3):415～416
[2]罗福龙.地震仪器概述及其指标分析(二).物探装备,2004,14(4):278～283
[3]刘益成,易碧金,罗福龙.地震数据采集系统谐波畸变测试方法研究.石油物探,2006,45(4):431～434
[4]张永学,何国信,孙健.GYZ4000型高精度遥测地震仪的研制.石油机械,2000,28(增刊):109～111
[5]张永学,印兴耀,宋建平,张在陆,薛慧珍.测试地震数据采集系统总谐波畸变的剪切FFT算法.石油地球物理勘探,2008,43(3):252～256
[6]张在陆.数据采集系统信号混叠的研究.石油仪器,1998,12(1):8～12
[7]王世一著.数字信号处理(修订版).北京:北京理工大学出版社,2005,103～118
[8]Harris FJ.On the use of windows for Harmonic anal-ysis with the discrete Fourier transform.Pro IEEE,1978,66(1):51～83
[9]Otis MSolomon Jr.The use of DFT windows in sig-nal-to-noise ratio and harmonic distortion computa-tions.IEEE Transactions on Instrumentation and Measurement,1978,43(2):194～199
[2]罗福龙.地震仪器概述及其指标分析(二).物探装备,2004,14(4):278～283
[3]刘益成,易碧金,罗福龙.地震数据采集系统谐波畸变测试方法研究.石油物探,2006,45(4):431～434
[4]张永学,何国信,孙健.GYZ4000型高精度遥测地震仪的研制.石油机械,2000,28(增刊):109～111
[5]张永学,印兴耀,宋建平,张在陆,薛慧珍.测试地震数据采集系统总谐波畸变的剪切FFT算法.石油地球物理勘探,2008,43(3):252～256
[6]张在陆.数据采集系统信号混叠的研究.石油仪器,1998,12(1):8～12
[7]王世一著.数字信号处理(修订版).北京:北京理工大学出版社,2005,103～118
[8]Harris FJ.On the use of windows for Harmonic anal-ysis with the discrete Fourier transform.Pro IEEE,1978,66(1):51～83
[9]Otis MSolomon Jr.The use of DFT windows in sig-nal-to-noise ratio and harmonic distortion computa-tions.IEEE Transactions on Instrumentation and Measurement,1978,43(2):194～199
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心