Conformable,programmable and step-linear sensor array for large-range wind pressure measurement on curved surface  

作　　者：XIONG WenNan GUO DongLiang YANG ZhaoXi ZHU Chen HUANG YongAn 

机构地区：[1]State Key Laboratory of Digital Manufacturing Equipment and Technology,Huazhong University of Science and Technology,Wuhan 430074,China [2]Flexible Electronics Research Center,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Science China(Technological Sciences)》2020年第10期2073-2081,共9页中国科学（技术科学英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.51635007 and 51925503);the Fundamental Research Funds for the Central Universities(Grant No.2016YXZD068)。

摘　　要：The wind pressure measurement,especially on curved surfaces is imperative in revealing flow characteristics.The flexible sensor with high linear sensitivity over large pressure range is still a significant challenge,especially for commutatively positive and negative pressure measurement.Here,we propose a conformable,range-programmable capacitive sensor that can extremely extend the measuring range but with high linear sensitivity.The key point is to precisely control the reference pressure of the flexible capacitive sensor array through microchannel network.The proposed sensor with reference pressure 0 kPa keeps stable at a highly-linear sensitivity of 0.28 kPa-1 in an initial measurement regime from 0 to 3 kPa,beyond which the linearity changes significantly.Via the tunable reference pressure,the linear ranges can be customized arbitrarily according to different flight conditions and measured positions,but without any deterioration of sensitivity.The theoretical model is built for the flexible capacitive sensor with tunable reference pressure,agreeing well with the experimental and finite element method results.Additionally,the bending effect is discovered when the flexible sensor is conformed on curved surfaces.This surface-mounted sensor skin is tested on a plate and is integrated with acquisition circuits on a standard airfoil NACA0012 in a wind tunnel and compares with the standard destructive method of pressure taps.It shows great potential applications in measuring wind pressure on curved surfaces,such as for"Fly-by-Feel"of unmanned aerial vehicles and wind tunnel test.

关 键 词：capacitive sensor flexible electronics smart sensing skin wind tunnel test unmanned aerial vehicles 

分 类 号：V211.74[航空宇航科学与技术—航空宇航推进理论与工程] TP212[自动化与计算机技术—检测技术与自动化装置]