期刊
JOURNAL OF BIOMEDICAL OPTICS
卷 18, 期 5, 页码 -出版社
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
DOI: 10.1117/1.JBO.18.5.057003
关键词
photoplethysmography; blood components; noninvasive measurement; dynamic spectrum; digital lock-in amplifier
资金
- National Natural Science Foundation of China [30973964]
- Tianjin Application Basis & Front Technology Study Programs [11JCZDJC17100]
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. (C) 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
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