Browsing by Author "Stavdahl, Øyvind"

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    CANCELLATION OF FORCE INDUCED ARTIFACTS IN SURFACE EMG USING FSR MEASUREMENTS
    (2008) Fougner, Anders; Sæther, Marthe; Stavdahl, Øyvind; Kyberd, Peter J.; Blum, Jeremy
    As multifunction prostheses become increasingly common, there is a need for improved control signal quality in order to control all the functions. Most signals commonly used for prosthesis control are sensitive to sweat, motion and external forces [1], which impairs prosthesis control performance. We have developed a prototype surface electromyogram (sEMG) sensor with three built‐in force sensing resistors (FSRs) for measuring the external forces, which may be used to cancel artifacts caused by these forces. The performance of the sensor as an estimator of muscle force is presented in this paper. The sEMG and FSR signals have also been tested individually, as a reference for the performance using the combination of these signals.
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    Multimodal Input Device With SEMG And Contact Force Sensors
    (2011) Stavdahl, Øyvind; Kyberd, Peter J.; Magne, Tordis; Ottermo, Maria V.; Mugaas, Terje
    In myoelectric prostheses, movement artifacts are known to impair control performance. This study relates to a novel sensor which measures surface electromyograms (SEMG) as well as contact force at the electrode-skin interface. Its purpose is to explore the in-socket mechanical realities of movement artifacts in order to produce control algorithms that are more robust to said artifacts. The new sensor includes a commercial SEMG electrode and four surface-mounted force sensors, stacked within a plastic housing. Preliminary experiments in an experienced transradial user showed that sudden lack of control was often caused by electrode lift-off or re-connection. Future work will include algorithms for alleviating these problems.
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    Resolving The Limb Position Effect
    (2011) Fougner, Anders; Scheme, Erik; Chan, Adrian D. C.; Englehart, Kevin; Stavdahl, Øyvind