By Steffen Leonhardt, Thomas Falck, Petri Mähönen
This booklet includes papers from the overseas Workshop on Wearable and Implantable physique Sensor Networks, BSN 2007, held in March 2007 on the collage health facility Aachen, Germany. subject matters coated within the quantity comprise new clinical measurements, clever bio-sensing textiles, low-power instant networking, method integration, clinical sign processing, multi-sensor information fusion, and on-going standardization actions.
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Additional info for 4th International Workshop on Wearable and Implantable Body Sensor Networks (BSN 2007): March 26-28, 2007 RWTH Aachen University, Germany (IFMBE Proceedings)
Fig. 11 shows the recorded signal by using a single embroidered sensor on the artificial muscle. Note that the envelope of the recorded square wave shows a 50 Hz noise signal. This is the result of the single-sensor approach. By using a single sensor with respect to a grounded reference, we will see 50 Hz noise as picked up capacitively from the environment. This will be cancelled when using the set-up of Fig 1. 4 3 Amplitude [mV] Connector holes In Fig. 12, the human EMG is measured on the biceps using two electrodes of the type of Fig.
27 ZBody), which could be attributed to the capacitive and different electrode coupling (influence of ZSkin-Electrode). A higher contact pressure (better electrode-skin contact) reduces ZGel and the same impedance values are achieved on every single electrode which actually improves the result. The results can be explained using an equivalent circuit for the four point measurement (see figure 8 right). g. case of standard BIS electrodes, or textile electrodes with gel) will eliminate the influence of IBias in the measurement and will allow the following result: Z= Fig.
The quick combination of contraction and relaxation of a muscle fibre is referred to as “twitch”. Since all muscle fibres in a muscle do not twitch simultaneously, the overall observed potential over a muscle is the random summation of multiple single fibre action potentials. This random signal is conducted to the surface of the skin by means of volume conduction. Surface electromyography (sEMG) electrodes are placed on the skin in order to record the muscle potentials. A common configuration is a set-up of two electrodes along a muscle contacting the skin using conductive gel.
4th International Workshop on Wearable and Implantable Body Sensor Networks (BSN 2007): March 26-28, 2007 RWTH Aachen University, Germany (IFMBE Proceedings) by Steffen Leonhardt, Thomas Falck, Petri Mähönen