Construction and testing of laminated fabric pressure distribution sensing system
With the development of the Internet of Things and sensing technology,people have designed pressure distribution sensing systems based on the fabric pressure sensing array,realized human-machine intelligent interaction,completed the measurement and analysis of the pressure distribution data of the human body or object,and applied them to the fields of attitude monitoring,classification and recognition.At present,the pressure distribution sensing systems can be divided into wearable ones and non-wearable ones.Among them,the non-wearable pressure distribution sensing system does not need to be worn during use.It is convenient to integrate with other technologies and has high scalability.It is favored by many researchers and shows broad application prospects in intelligent medical treatment,rehabilitation nursing,and motion detection.However,the pressure distribution sensing system still faces many challenges in preparation and use,such as complex manufacturing process,difficult-to-achieve large-scale production,limited use in fixed workplaces,and crosstalk effects.To facilitate the application of the pressure distribution sensing system to various occasions and reduce the crosstalk effect,in this study,a two-layer laminated fabric pressure sensing array was prepared,and a laminated fabric pressure distribution sensing system was constructed by combining the fabric packaging layer and the data acquisition module.The fabric pressure sensing array is composed of two layers of substrate fabric,silver-plated conductive yarn and sensing unit.The upper layer of the substrate fabric was stitched with silver-plated conductive yarn at equal intervals in the weft direction and the lower layer of the substrate fabric in the warp direction,and the pressure-sensitive material was printed.The two layers of fabrics were stacked orthogonally with conductive yarns to form a sensing unit at the intersection of warp and weft conductive yarns.To facilitate the application of the fabric pressure sensing array to various occasions,it was encapsulated with a stacked fabric packaging layer to provide mechanical protection.The data acquisition module of the pressure distribution sensor array was designed to complete the data acquisition and upload,and a reasonable flexible circuit board was designed for the connection between the conductive yarn on the substrate fabric and the data acquisition module.The electrical and mechanical properties of the sensing unit of the fabric pressure distribution sensing system were experimentally studied,and the constructed fabric pressure distribution sensing system was tested.It is found that the reciprocal of the resistance value of the sensing unit is approximately linear with the pressure,and the piezoresistive response characteristics are good.After 500 cycles of pressure tests,the sensing unit can respond stably to external signals.Based on the collected data,the pressure distribution cloud map is drawn.Under four different conditions,the fabric pressure distribution sensing system can better present the distribution of the pressure applied by the measured object.The pressure sensing array with double-layer superimposed structure makes the initial state of each sensing unit in the system more consistent,which can effectively reduce the noise interference introduced by the series-parallel path between the sensing units.The system shows good application prospects in the fields of disease prevention,motion monitoring,fall detection and so on.
万方数据
维普
