A Novel Ring Shaped Photodiode for Reflectance Pulse Oximetry in Wireless Applications

Sune Duun, Rasmus Grønbek Haahr, Karen Birkelund, P. Raahauge, P. Petersen, H Dam, L. Noergaard, Erik Vilain Thomsen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    1170 Downloads (Pure)

    Abstract

    We present a pulse oximeter for use in home-care applications in a sticking patch with integrated electronics. The core in the pulse oximeter is a large ring shaped backside silicon pn photodiode placed around a Ledtronics dual LED with wavelengths of 660 nm and 940 nm. The concentric photodiode gives optimal gathering of light and thereby enabling lower LED drive currents and lower power consumption. To further optimize the photodiode a two layer SiO2/SiN interference filter is employed yielding 98% transmission at the wavelengths of the LED and damping of other wavelengths. The presented photodiode has an inner-outer radius of 3.29 -4.07 mm and an area of 18 mm2 , however, photodiodes with ring center radii ranging from 2.8 -4.9 mm have been fabricated. Using the pulse oxymetry sensor photoplethysmograms clearly showing the cardiovascular cycle are recorded. An on-chip integrated Au thermistor for surface body temperature measurements is found to have a repeatability of plusmn0.26degC.
    Original languageEnglish
    Title of host publicationProceeedings of the 6th IEEE Conference on Sensors
    PublisherIEEE
    Publication date2007
    Pages596-599
    ISBN (Print)978-1-4244-1262-4
    DOIs
    Publication statusPublished - 2007
    Event6th IEEE Conference on Sensors - Atlanta, GA
    Duration: 1 Jan 2007 → …

    Conference

    Conference6th IEEE Conference on Sensors
    CityAtlanta, GA
    Period01/01/2007 → …

    Bibliographical note

    Copyright: 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

    Fingerprint Dive into the research topics of 'A Novel Ring Shaped Photodiode for Reflectance Pulse Oximetry in Wireless Applications'. Together they form a unique fingerprint.

    Cite this