Study On Flexible Packed Pressure/Tactile Sensor

In recent years,the smart terminals are emerging with the vigorous development of the“Internet of Things”and artificial intelligence.As the"five senses organs"of smart products,sensors have become the focus of current research.In particular,flexible mechanical sensors widely used in intelligent robots and healthy monitoring can convert pressure and tactile into electrical signals that are easy to be operated so as to detect external forces.However,most flexible mechanical sensors have single function,complex manufacturing process and narrow pressure testing range.Currently,it is of great significance to study flexible mechanical sensors with high sensitivity,wide pressure sense range,short response time and ability to detect pressure and tactile.Here,two kinds of flexible packed pressure/tactile sensors and one closed pressure sensor were designed and prepared,and with systematical study on their performances,applications and resistance to harsh environments.The main contents of this thesis are as the follows:?1?Study on flexible packed pressure/tactile sensor based on velcro/polydimethylsiloxane?PDMS?porous structure.The porous structure of PDMS on velcro was prepared with the special pore-forming reagent.Then the velcro with pressure/tactile sensing function was prepared by the dipping method,and finally assembled into a flexible packed pressure/tactile sensor.According to performance tests,it could response and distinguish pressure/tactile.In addition,it had the characteristics of wide pressure test range?0.2⁴80 kPa?,short response time?pressure:0.15 s;tactile:0.2 s?,and excellent repeatability.The sensor could detect pulse,vibration and finger posture.Finally,according to the results of the sensor's resistance to harsh environments,it showed that the sensor had outstanding temperature stability and acid/alkali corrosion resistance.?2?Study on flexible packed pressure/tactile sensor based on carbon fiber composite fabric.Firstly,a piece of fabric was put into the oxidized carbon nanotube dispersion for 5 min,then taken out for drying.The above procedure was repeated for several times.Then the fabric modified with carbon oxide nanotube was assembled into a flexible closed pressure/tactile sensor.The sensor not only had a high pressure sensitivity(?0.03 kPa^?1),but also could detect pressure as small as 72 Pa.In addition,the sensor had the advantages of short response time,low hysteresis,excellent resistance to acid/alkali corrosion and good temperature stability.Finally,the sensor could sense the force generated by the holding the cup,wrist posture,standing,and collision of water droplets.?3?Study on flexible packed pressure sensor based on carbon nanotube fibers.Carbon nanotube fibers were synthesized by chemical vapor deposition method by which a flexible packed pressure sensor was assembled.The sensor had high sensitivity(?0.1 kPa^?1),short response time?37 ms?,good repeatability and it still maintained its original state after processing in wretched conditions.Based on the high sensitivity and the short response time of the sensor,it could sense pharyngeal movements and pulse signals.