A battery-free tag for wireless monitoring of heart sounds
Name
Mandal-2009-A battery-free tag for wireless monitoring of heart sounds.pdf
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1.15 MB
Format
Adobe PDF
Checksum (MD5)
439a6165ff4bbe1bc11efa8c37b17c16
Author(s)
Mandal, Soumyajit
Turicchia, Lorenzo
Sarpeshkar, Rahul
Date Issued
August 2009
Journal
Sixth International Workshop on Wearable and Implantable Body Sensor Networks, 2009. BSN 2009
Publisher
Institute of Electrical and Electronics Engineers
Citation
Mandal, S., L. Turicchia, and R. Sarpeshkar. “A Battery-Free Tag for Wireless Monitoring of Heart Sounds.” Wearable and Implantable Body Sensor Networks, 2009. BSN 2009. Sixth International Workshop on. 2009. 201-206. ©2009 IEEE.
Version
Final published version
Abstract
We have developed a wearable, battery-free tag that monitors heart sounds. The tag powers up by harvesting ambient RF energy, and contains a low-power integrated circuit, an antenna and up to four microphones. The chip, which consumes only 1.0 uW of power, generates digital events when the outputs of any of the microphones exceeds a programmable threshold voltage, combines such events together by using a programmable logic array, and transmits them to a base station by using backscatter modulation. The chip can also be programmed to trade-off microphone sensitivity for power consumption. In this paper, we demonstrate that the tag, when attached to the chest, can reliably measure heart rate at distances up to 7 m from an FCC-compliant RF power source. We also suggest how delays between signals measured by microphones at the wrist and neck can be used to provide information about relative blood-pressure variations.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Research Laboratory of Electronics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1109/BSN.2009.11
