System identification for characterization of the frequency response of an 'open-source' biomedical circuit

Edmond Zahedi, Mohd Alauddin Bin Mohd Ali

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

    Abstract

    In this paper, system identification techniques are applied to accurately characterize the frequency behavior of a commercially available but with unknown characteristics of a photoplethysmography (under the commercial name of Pulse Sensor). Although claimed to be open-source, the electronic schematic of this device does not allow for a full characterization of it. Therefore a second order auto-regressive with exogenous input model has been employed to find the frequency response of this system. An optical excitation circuit was developed to send a pseudo-random signal to the Pulse Sensor. Results show that the model is able to reproduce the output with a fitness of 89.7 %. The obtained model is validated by using the inverse of the obtained transfer function to reconstruct the input. Accurate determination of the frequency response of the Pulse Sensor allows for the reconstruction of the real input. The proposed approach can also be applied to teach engineering students about reverse engineering and system identification.

    Original languageEnglish
    Title of host publicationIECBES 2014, Conference Proceedings - 2014 IEEE Conference on Biomedical Engineering and Sciences: "Miri, Where Engineering in Medicine and Biology and Humanity Meet"
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages225-229
    Number of pages5
    ISBN (Print)9781479940844
    DOIs
    Publication statusPublished - 23 Feb 2015
    Event3rd IEEE Conference on Biomedical Engineering and Sciences, IECBES 2014 - Kuala Lumpur
    Duration: 8 Dec 201410 Dec 2014

    Other

    Other3rd IEEE Conference on Biomedical Engineering and Sciences, IECBES 2014
    CityKuala Lumpur
    Period8/12/1410/12/14

    Fingerprint

    Frequency response
    Identification (control systems)
    Networks (circuits)
    Sensors
    Photoplethysmography
    Reverse engineering
    Photoexcitation
    Schematic diagrams
    Transfer functions
    Students

    Keywords

    • Open-source components
    • photoplethysmography
    • system identification

    ASJC Scopus subject areas

    • Biomedical Engineering

    Cite this

    Zahedi, E., & Mohd Ali, M. A. B. (2015). System identification for characterization of the frequency response of an 'open-source' biomedical circuit. In IECBES 2014, Conference Proceedings - 2014 IEEE Conference on Biomedical Engineering and Sciences: "Miri, Where Engineering in Medicine and Biology and Humanity Meet" (pp. 225-229). [7047491] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/IECBES.2014.7047491

    System identification for characterization of the frequency response of an 'open-source' biomedical circuit. / Zahedi, Edmond; Mohd Ali, Mohd Alauddin Bin.

    IECBES 2014, Conference Proceedings - 2014 IEEE Conference on Biomedical Engineering and Sciences: "Miri, Where Engineering in Medicine and Biology and Humanity Meet". Institute of Electrical and Electronics Engineers Inc., 2015. p. 225-229 7047491.

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

    Zahedi, E & Mohd Ali, MAB 2015, System identification for characterization of the frequency response of an 'open-source' biomedical circuit. in IECBES 2014, Conference Proceedings - 2014 IEEE Conference on Biomedical Engineering and Sciences: "Miri, Where Engineering in Medicine and Biology and Humanity Meet"., 7047491, Institute of Electrical and Electronics Engineers Inc., pp. 225-229, 3rd IEEE Conference on Biomedical Engineering and Sciences, IECBES 2014, Kuala Lumpur, 8/12/14. https://doi.org/10.1109/IECBES.2014.7047491
    Zahedi E, Mohd Ali MAB. System identification for characterization of the frequency response of an 'open-source' biomedical circuit. In IECBES 2014, Conference Proceedings - 2014 IEEE Conference on Biomedical Engineering and Sciences: "Miri, Where Engineering in Medicine and Biology and Humanity Meet". Institute of Electrical and Electronics Engineers Inc. 2015. p. 225-229. 7047491 https://doi.org/10.1109/IECBES.2014.7047491
    Zahedi, Edmond ; Mohd Ali, Mohd Alauddin Bin. / System identification for characterization of the frequency response of an 'open-source' biomedical circuit. IECBES 2014, Conference Proceedings - 2014 IEEE Conference on Biomedical Engineering and Sciences: "Miri, Where Engineering in Medicine and Biology and Humanity Meet". Institute of Electrical and Electronics Engineers Inc., 2015. pp. 225-229
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