Photoplethysmograph sensor based on light-to-frequency converter

Tang Chi Yung, Edmond Zahedi, Mohd Alauddin Mohd Ali

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    This paper describes a low cost high sensitivity photoplethysmograph sensor based on a light-to-frequency converter. A working prototype, consisting of a probe, a dataprocessing unit, a PC real-time data display with graphical user interface (GUI), is built. For the probe, a light-to-frequency converter and an IR LED are integrated into the center button of a three buttons PC mouse, with the left and right buttons operating as the IR LED switch. The volume of blood circulation through the finger modulates the light intensity of the reflected IR beam from the finger bone. The light-to-frequency converter converts the light intensity changes into a pulse train of corresponding frequencies, which are accumulated in a counter. A micro-controller then reads the counter value at 200 Hz and transmits it to the PC for further analysis. Optocouplers are used in the communication path between the system and the PC to provide electrical isolation between the user and the PC power supply. The resulting waveforms are validated through comparison with a commercial system.

    Original languageEnglish
    Title of host publication2005 1st International Conference on Computers, Communications and Signal Processing with Special Track on Biomedical Engineering, CCSP 2005
    Pages221-224
    Number of pages4
    DOIs
    Publication statusPublished - 2005
    Event2005 1st International Conference on Computers, Communications and Signal Processing with Special Track on Biomedical Engineering, CCSP 2005 - Kuala Lumpur
    Duration: 14 Nov 200516 Nov 2005

    Other

    Other2005 1st International Conference on Computers, Communications and Signal Processing with Special Track on Biomedical Engineering, CCSP 2005
    CityKuala Lumpur
    Period14/11/0516/11/05

    Fingerprint

    Frequency converters
    Sensors
    Light emitting diodes
    Hemodynamics
    Graphical user interfaces
    Bone
    Switches
    Controllers
    Communication
    Costs

    Keywords

    • Instrumentation
    • Photoplethysmogram
    • Real-time

    ASJC Scopus subject areas

    • Computer Networks and Communications
    • Signal Processing
    • Biomedical Engineering

    Cite this

    Yung, T. C., Zahedi, E., & Mohd Ali, M. A. (2005). Photoplethysmograph sensor based on light-to-frequency converter. In 2005 1st International Conference on Computers, Communications and Signal Processing with Special Track on Biomedical Engineering, CCSP 2005 (pp. 221-224). [4977194] https://doi.org/10.1109/CCSP.2005.4977194

    Photoplethysmograph sensor based on light-to-frequency converter. / Yung, Tang Chi; Zahedi, Edmond; Mohd Ali, Mohd Alauddin.

    2005 1st International Conference on Computers, Communications and Signal Processing with Special Track on Biomedical Engineering, CCSP 2005. 2005. p. 221-224 4977194.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Yung, TC, Zahedi, E & Mohd Ali, MA 2005, Photoplethysmograph sensor based on light-to-frequency converter. in 2005 1st International Conference on Computers, Communications and Signal Processing with Special Track on Biomedical Engineering, CCSP 2005., 4977194, pp. 221-224, 2005 1st International Conference on Computers, Communications and Signal Processing with Special Track on Biomedical Engineering, CCSP 2005, Kuala Lumpur, 14/11/05. https://doi.org/10.1109/CCSP.2005.4977194
    Yung TC, Zahedi E, Mohd Ali MA. Photoplethysmograph sensor based on light-to-frequency converter. In 2005 1st International Conference on Computers, Communications and Signal Processing with Special Track on Biomedical Engineering, CCSP 2005. 2005. p. 221-224. 4977194 https://doi.org/10.1109/CCSP.2005.4977194
    Yung, Tang Chi ; Zahedi, Edmond ; Mohd Ali, Mohd Alauddin. / Photoplethysmograph sensor based on light-to-frequency converter. 2005 1st International Conference on Computers, Communications and Signal Processing with Special Track on Biomedical Engineering, CCSP 2005. 2005. pp. 221-224
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