Research on CO2 Sensor Correcting System Based on ZigBee Net
Hou Ming, Gou LiMing · The Open Automation and Control Systems Journal · 2014
It designs a signal acquisition system based on ZigBee wireless sensor network, and designs CO2 gas mixing device. In the data processing process, a method to strike a reliable interpolation node based on mathematical statistics is proposed. First, enough static data is processed by Kalman filter to reduce the noise; then the processed static data is ana- lyzed to gain the probability distribution, and then through the goodness of fit test to judge the distribution of the meas- urement data to obtain reasonable values (mathematical expectation) as the interpolation nodes. Non-equidistant cubic spline interpolation method has been used to gain the sensor characteristic curve. A kind of Carbon dioxide digital sensors has been tested in experiments. Compared with the traditional method of Mean, this method can improve the interpolation accuracy by 13%. Test system has a better economy and ease of use.