Method to improve measuring accuracy of harmonic distortion of seismic prospecting instrument
Zhang Yong-xue1, Yin Xing-yao2, Song Jian-ping1
1. Education of Ministry Key Lab of Electronics Physics and Devices, Xi'an Jiaotong University, Xi'an City, Shaanxi Province, 710049, china;
2. College of Geo-Resources and Information, China University of Petroleum (East China),Qingdao City, Shandong Province, 266555, China
Abstract：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.
