An Improved Vital Signal Extraction Method Based on Laser Doppler Effect
The mixed signal of respiratory waveform and heartbeat waveform detected by the Laser-Doppler system is processed with an intermediate-frequency (IF) interference filtering method, an enhanced extraction method and a waveform-fixing method. To filter the IF interference signals and the noise scatter...
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MDPI AG
2024-10-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/24/21/7027 |
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| author | Yu Li Haiyang Zhang Bowen Zhang Yujiao Qi Si Chen |
| author_facet | Yu Li Haiyang Zhang Bowen Zhang Yujiao Qi Si Chen |
| author_sort | Yu Li |
| collection | DOAJ |
| description | The mixed signal of respiratory waveform and heartbeat waveform detected by the Laser-Doppler system is processed with an intermediate-frequency (IF) interference filtering method, an enhanced extraction method and a waveform-fixing method. To filter the IF interference signals and the noise scatters in the time-frequency graph, the filtering method based on coefficient of variation (CoV) values and the enhanced curve extraction method based on noise-scatter theory are utilized in vital signal analysis. To decouple the respiratory signal and the heartbeat signal in time domain, the waveform-fixing method based on second-order difference theory is utilized in signal decoupling. This method as an algorithm is applied in the computer simulation and laboratory environments. The results show that the above methods can extract the mixed waveforms and identify the respiratory rates and heart rates in real experimental data. The IF interference signal can be filtered adaptively, and the accuracy of the analyzed rates can be improved to about 95%. |
| format | Article |
| id | doaj-art-ca9f29c2a4704354b188604e80b5732b |
| institution | OA Journals |
| issn | 1424-8220 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj-art-ca9f29c2a4704354b188604e80b5732b2025-08-20T02:14:16ZengMDPI AGSensors1424-82202024-10-012421702710.3390/s24217027An Improved Vital Signal Extraction Method Based on Laser Doppler EffectYu Li0Haiyang Zhang1Bowen Zhang2Yujiao Qi3Si Chen4School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, ChinaThe mixed signal of respiratory waveform and heartbeat waveform detected by the Laser-Doppler system is processed with an intermediate-frequency (IF) interference filtering method, an enhanced extraction method and a waveform-fixing method. To filter the IF interference signals and the noise scatters in the time-frequency graph, the filtering method based on coefficient of variation (CoV) values and the enhanced curve extraction method based on noise-scatter theory are utilized in vital signal analysis. To decouple the respiratory signal and the heartbeat signal in time domain, the waveform-fixing method based on second-order difference theory is utilized in signal decoupling. This method as an algorithm is applied in the computer simulation and laboratory environments. The results show that the above methods can extract the mixed waveforms and identify the respiratory rates and heart rates in real experimental data. The IF interference signal can be filtered adaptively, and the accuracy of the analyzed rates can be improved to about 95%.https://www.mdpi.com/1424-8220/24/21/7027Laser-Dopplervital signalsignal filteringwaveform decoupling |
| spellingShingle | Yu Li Haiyang Zhang Bowen Zhang Yujiao Qi Si Chen An Improved Vital Signal Extraction Method Based on Laser Doppler Effect Sensors Laser-Doppler vital signal signal filtering waveform decoupling |
| title | An Improved Vital Signal Extraction Method Based on Laser Doppler Effect |
| title_full | An Improved Vital Signal Extraction Method Based on Laser Doppler Effect |
| title_fullStr | An Improved Vital Signal Extraction Method Based on Laser Doppler Effect |
| title_full_unstemmed | An Improved Vital Signal Extraction Method Based on Laser Doppler Effect |
| title_short | An Improved Vital Signal Extraction Method Based on Laser Doppler Effect |
| title_sort | improved vital signal extraction method based on laser doppler effect |
| topic | Laser-Doppler vital signal signal filtering waveform decoupling |
| url | https://www.mdpi.com/1424-8220/24/21/7027 |
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