Research on CO Sensor Correcting System Based on ZigBee Net

ABSTRACT

It designs a signal acquisition system based on ZigBee wireless sensor network, and designs CO₂gas 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 analyzed to gain the probability distribution, and then through the goodness of fit test to judge the distribution of the measurement 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.

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