الفهرس | Only 14 pages are availabe for public view |
Abstract Smart clothes are garments with new features which provide sensing, communication with the environment and the wearer condition and stimuli. Senses responses can be in different forms such as electrical, thermal and mechanical. Biosensors are sensors able to measure the vital signs like respiration, temperature and heart rate. Non- contact biosensor fabrics is an alternative method for persons who have sensitive or weak skin and can’t allow conventional electrode. This study was carried out in order to produce knitting sensor fabric, suitable for sensing human breathing (mechanical movement). The sensor fabric manufactured from Silver coated nylon yarn knitted with Nylon / Lycra yarn differ in their combination ratios as well as other knitting production parameters such as, stitch length, knitting construction (single jersey and Rib structure) and needle numbers which refers to the width of the knitted fabric sensor, adding to that using the float stitch in order to study the influence of the different stitch on the electrical resistance. It can be a part of a cloth attached or applied on the human body for monitoring breathing status. In order to reach the reliable breathing sensor a cyclic tester was designed and built, this device simulate the mechanism of breathing as well as compute the electrical resistance of the fabric during stretching (contraction/ relaxation). Besides, the change of electrical resistance was calculated which is important for the discrimination of the breathing rate. from the results it can be seen that, the production parameters have a great influence on the electrical resistance values. The combination ratio (CR), number of needles (width of the sensor), and stitch type (ST) has a significant increase on the resistance values and change of resistance. Furthermore, the less the number of conductive yarns combined with non-conductive yarn the higher resistance will be and the higher the change of resistance the better the accuracy of discrimination of breathing cycles. Finally, A prototype of smart belt was designed, attached with the reliable breathing knitted sensor (optimum sample) and data transferred with wireless via Bluetooth measuring unit. Key words: Conductive knitting fabric - Smart clothes - Wearable biosensor - Breathing sensor- Stitch type - Combination ratio. |