Research Papers: Sensing

Fast digital lock-in amplifier for dynamic spectrum extraction

[+] Author Affiliations
Mei Zhou, Gang Li

Tianjin University, School of Precision Instrument and Opto-Electronics Engineering, Tianjin 300072, China

Ling Lin

Tianjin University, State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin 300072, China

J. Biomed. Opt. 18(5), 057003 (May 07, 2013). doi:10.1117/1.JBO.18.5.057003
History: Received November 13, 2012; Revised April 9, 2013; Accepted April 11, 2013
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Abstract.  An appropriate method for spectrum extraction for better signal-to-noise ratio (SNR) and lower computational cost is essential in noninvasive detection. We have first studied two existing extraction methods for dynamic spectrum (DS) comparatively: frequency domain analysis and single trial estimation; after analyzing the advantages and disadvantages theoretically, a new method based on a fast digital lock-in amplifier (FDLIA) was developed to overcome the limitations of these two existing methods. The feasibility of the new method was verified by experiments and the results demonstrated that the FDLIA method based on DS had greatly simplified the computation of frequency domain analysis without the method error; moreover, the continuous signal was cut into several short segments in FDLIA and the gross errors from an episode of pulse wave were eliminated, and thus SNR improved. Therefore, the FDLIA method utilizing the advantages of both existing methods can be effectively realized in a general embedded system in real time for its simple algorithm.

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© 2013 Society of Photo-Optical Instrumentation Engineers

Citation

Mei Zhou ; Gang Li and Ling Lin
"Fast digital lock-in amplifier for dynamic spectrum extraction", J. Biomed. Opt. 18(5), 057003 (May 07, 2013). ; http://dx.doi.org/10.1117/1.JBO.18.5.057003


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