Electrostatic analysis and design of a cable-free body area network of sensor nodes using 2D communication over conductive fabric sheets
ABSTRACT In recent years, wearable sensing networks have been the focus of the biotechnology industry. A continuing the question is how best to integrate electronic components with the human body. The authors have devised a body area network that relies on two innovations; the use of conductive fabrics, and the use of DC powerline communication. By combining these innovations, we have created a truly wearable network that allows full generality of sensor location, spatial distribution of the medium to reduce overall bulk, and maintains sufficiently low line impedance for simultaneous power and data delivery over a single conductor. We have created a method for analysis of the transmission properties of conductive fabric garments. In addition, we evaluate the basic transmission line characteristics of the garment. Finally, we present a verification of our model and initial experimental results.
Article: Textile tools for wearable computing
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ABSTRACT: A wearable DC powerline communication (PLC) network for health monitoring and rehabilitation is proposed. The network infrastructure is based on a novel use of conductive fabrics as the electrical transmission medium. Whereas other wearable networks rely on bulky sensors and cables, we combine PLC technology and intelligent sensor design to create a noninvasive, comfortable, flexible, and washable monitoring network. Additionally, the design allows us to incorporate multiple nodes in a single network. The network consists of three components; sensor nodes that are composed of a sensor, microprocessor, and local amplifier, a 'central' node that provides power to and processes information from the various sensor nodes in the network, and a two conductive sheets as the medium for power and data transmission. Using this medium, we can collect and record biological data from multiple sensor nodes to monitor the user's state. We will begin by reviewing a novel DC PLC network. Next, we will discuss the design of the conductive fabric vest and its salient features. Finally, we will present results of our initial experimental results and the future plans for this work.Conference proceedings: ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 02/2004; 7:5376-9.
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ABSTRACT: A system of networked smart motors is developed to reduce complex cable harnesses. Motor control signals are sent over the DC power bus line and receiver by motors with integrated power amplifiers and controller. Unlike traditional AC power line communication, the noise level and signal attenuation are much lower for the DC power bus communication. This allows for high fidelity, broadband communication among many smart motors without bulky, costly cables. A modem is designed to exploit the features of the DC power bus communication. Experimentation is done to verify that the DC bus line is indeed useful for communication. An experimental setup was developed to identify the noise spectrum and signal transmissibility of the consolidated power-signal line. Optimal carrier frequency and filter parameters are then obtained based on the experiments.Intelligent Robots and Systems, 2003. (IROS 2003). Proceedings. 2003 IEEE/RSJ International Conference on; 12/2003