摘要
介绍了一种用于测量风速的组合铂膜探头,由于其输出特征曲线是非线性的,会直接影响风速仪的精度,根据正交多项式最小二乘拟合算法,运用单片机处理器电路,设计了组合铂膜探头线性化输出风速仪,输出方式可通过跳线方便地切换为标准的0～10V电压或4～20mA电流,可使用11～30V交流或直流电压,较好适应工业用低压电源电压不稳定的场合,并在风洞实验中得以验证。本设计利用最小二乘拟合算法计算出的拟合误差在±0.5%以内,线性度优于1.5%。
An anemometer based on an assembled platinum-film probe is recommended. The non-linear output characteristic curve,which can be obtained, could influence the precision of the detection system directly. According to the curve fitting theory of orthogonal polynomials least-squares approximation, a linearoutput anemograph based on assembled platinum-film sensor and single chip microcomputer is designed. The power supply can be chosen 11V-30V AC or DC voltage. Thus, the system can be adapted to the unstable occasion in voltage. The linear output, 0-10V voltage or 4-20mA current, can be shifted alternatively just by jumper wire selected. The results have been proved in correlative wind-tunnel experiments. The error of fitting curve is less than ±0. 5% ,and the linearity value is less than 1.5%.
出处
《传感技术学报》
CAS
CSCD
北大核心
2009年第7期941-945,共5页
Chinese Journal of Sensors and Actuators
关键词
风速仪
组合铂膜探头
线性化
最小二乘
anemograph
assembled platinum-film probe
linearization
Least-squares fitting
