吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (3): 996-1003.doi: 10.13229/j.cnki.jdxbgxb201603047

• Orginal Article • Previous Articles     Next Articles

Improved orthogonal lock-in amplification based on step wave reference signal

ZHOU Feng-dao1, 2, DING Kai-lai1, ZENG Xin-sen1, XUE Kai-chang1, SUN Cai-tang1, 2   

  1. 1.College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China;
    2.National Geophysical Exploration Equipment Engineering Research Center, Jilin University,Changchun 130061, China
  • Received:2015-01-09 Online:2016-06-20 Published:2016-06-20

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Abstract: The detection accuracy of the step wave reference orthogonal lock-in amplification is modeled and analyzed, and the implementation strategy based the principle of using simple hardware is presented. Considering the relationship between the frequency waveform distortion and the sampling rate, the synthesis strategies of step wave based on equivalent area method and selected harmonic elimination method are comparatively analyzed. According to the phase accuracy requirement of step wave reference signal acquisition and the periodicity of the signal to be tested, a matching sampling technique is proposed. Experiments results show that the proposed orthogonal lock-in amplification can achieved by Field Programmable Gate Array (FPGA), and the method is simple and has low hardware requirement, can be used to identify different anomaly bodies. The error of the improved method is 0.7% to 7.0%. Compared with the square wave reference orthogonal lock-in amplification, the detection accuracy is improved by the new method.

Key words: information processing technology, near-surface, orthogonal lock-in amplification, step wave

CLC Number: 

  • TH763.1
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