Title:
MICROBENDING FIBER-OPTIC SENSOR FOR VITAL SIGN MONITORING AND CO-EXTRACTION OF RESPIRATION AND HEARTRATE
Document Type and Number:
WIPO Patent Application WO/2022/088221
Kind Code:
A1
Abstract:
A fiber-optic sensor matt(12) detects movements of a person on the matt(12) that cause microbending of a fiber-optic cable(10) that is arranged into a symmetric pair of radial ring groups within the matt(12). There are no cross-over points or overlapping of the fiber-optic cable(10) within the symmetric pair of radial ring groups that could cause fiber wear and noisy readings. Microbending of the fiber-optic cable(10) pressed into a mesh(18) modulates the light intensity received, which is analyzed to extract both respiration and heart BallistoCardioGram (BCG) waveforms by convolution with Daubechies dB5 wavelet and scaling functions. The reconstructed level-4 detail waveform is output as the extracted BCG
, while the reconstructed level-6 approximation waveform is output as the extracted respiration waveform. Respiration and heart rates and variations can be generated from the extracted waveforms. An integrated Fast Wavelet Transform (FWT) using dB5 wavelet thus generates both respiration rate and heart rate.
Inventors:
ZHAO QIAN CHENG (CN)
LEUNG TSZ CHUNG (CN)
KWOK MAN SANG (CN)
LEUNG TSZ CHUNG (CN)
KWOK MAN SANG (CN)
Application Number:
PCT/CN2020/126702
Publication Date:
May 05, 2022
Filing Date:
November 05, 2020
Export Citation:
Assignee:
HONG KONG APPLIED SCIENCE & TECH RESEARCH INST CO LTD (CN)
International Classes:
A61B5/0205
Domestic Patent References:
| WO2015112095A1 | 2015-07-30 |
Foreign References:
| CN107072565A | 2017-08-18 | |||
| CN110558956A | 2019-12-13 | |||
| CN111343902A | 2020-06-26 | |||
| CN110448282A | 2019-11-15 | |||
| CN110974198A | 2020-04-10 |
Attorney, Agent or Firm:
BEIJING PAT SF INTELLECTUAL PROPERTY AGENCY CO. LTD (CN)
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