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Volume 31 Issue 8
Dec.  2010
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Xie Qiong, Li Jian-ping, Gao Xiao-guang, Jia Jian. Dynamic Multi-frequency Digital Lock-in Algorithm and Its Application[J]. Journal of Electronics & Information Technology, 2009, 31(8): 2006-2010. doi: 10.3724/SP.J.1146.2008.01015
Citation: Xie Qiong, Li Jian-ping, Gao Xiao-guang, Jia Jian. Dynamic Multi-frequency Digital Lock-in Algorithm and Its Application[J]. Journal of Electronics & Information Technology, 2009, 31(8): 2006-2010. doi: 10.3724/SP.J.1146.2008.01015

Dynamic Multi-frequency Digital Lock-in Algorithm and Its Application

doi: 10.3724/SP.J.1146.2008.01015
  • Received Date: 2008-08-25
  • Rev Recd Date: 2009-01-05
  • Publish Date: 2009-08-19
  • A dynamic multi-frequency digital lock-in algorithm is presented in this paper. By this algorithm, the amplitude of the signal composed of the fundamental and the harmonics can be obtained. And in addition, the problem of frequency drift is solved by rectifying the reference frequency dynamically. Compared with the traditional method, this novel algorithm uses more information and does not need to choose the reference signal. When applied to NDIR gas concentration measurement, it not only widens the measurement range, but also improves the sensitivity of the detection.
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