Research On Wearable Flexible Pressure Sensors

Wearable flexible pressure sensors have broad application prospects in simulation,sensory function reconstruction,artificial intelligence,wearable equipment,and human-machine interaction.At present,the working principle of wearable flexible pressure sensors is mainly divided into piezoresistive sensors,capacitive sensors and piezoelectric sensors.In order to solve the two practical problems:human-machine interaction and human throat status recognition detection,this paper has designed the wearable flexible piezoelectric pressure sensor with interference immunity capability（PFPS-ⅡC）and high-sensitivity wearable flexible capacitive sensor with double-sided micro-pillar array（CFPS-DSMA）.The main research work includes the following two aspects:（1）The PFPS-ⅡC proposed in this papre which is used to solve the problem of human-computer interconnection on the human wrist,and the PFPS-ⅡC is manufactured through the template method.First of all,the theoretical research of PFPS-ⅡC,secondly,simulate the working principle and anti-interference ability of the sensor unit of PFPS-ⅡC,and finally experiment with PFPS-ⅡC.The experimental results show that the PFPS-ⅡC can effectively identify the position where the specific sensing unit is pressed,and the interference signal output voltage only accounts for 8%of the signal output voltage of the sensing unit.The pressure range of PFPS-ⅡC is from 0 N to 80 N,which can detect a curved angle from 0°to 120°.At the same time,PFPS-ⅡC has the ability to detect bending under constant external forces.PFPS-ⅡC can work stably within the range from 0 mm to 6 mm of the stretching rate from 0%to 8.6%.At the same time,PFPS-ⅡC also has the ability to slide trajectory recognition,which can effectively identify information such as sliding numbers on the surface of the sensor.（2）This paper proposes that CFPS-DSMA is used to solve the problem of the state of the throat status recognition testing,and the CFPS-DSMA is manufactured through the micro-milling processing method.First of all,the theoretical research of the CFPS-DSMA,secondly,simulate the effect of the physical characteristics of the CFPS-DSMA dielectric layer,and finally experimented with the CFPS-DSMA.The experimental results show that the CFPS-DSMA sensitivity is the highest when dielectric layer structure has a double-sided micro-pillar array structure,the thickness of the PDMS substrate is 1200μm,the angle of the double-sided micro-pillar is 45°,the height of the double-sided micro-pillar is 50μm,and the spacing of the double-sided micro-pillar is 300μm.The pressure detection range of CFPS-DSMA is from 0 k Pa to 17 k Pa,and the maximum sensitivity is 0.523 k Pa^-1.It can maintain a stable working state within the first week of the air humidity range from 20-60%,1000 times and the first week after manufacturing.The response time of CFPS-DSMA is 150ms and the recovery time is 100 ms.At the same time,CFPS-DSMA also has the ability to identify the state of the throat,which can identify the static state,deep breathing state,language vocalization and swallowing status of the body’s throat.In short,the PFPS-ⅡC and CFPS-DSMA proposed in this paper which have the characteristics of simple,fast,no complex equipment,strong anti-interference ability,and high sensitivity to solve the body wrist human-computer interconnection and throat status recognition testing provisionn a new plan.The PFPS-ⅡC and CFPS-DSMA proposed in this paper will have broad application prospects in the medical field,sports rehabilitation,health monitoring,future human-computer interaction,early disease prevention,and personalized medical care.