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由于电化学传感器在超量程段的输出为曲线输出,测量误差范围较大。对此,提出了曲线拟合法来予以校正,为测量大浓度气体时出现的量程超限提供了一种解决方法,给出了校正原理及实验电路,测试得到瓦斯电化学传感器在其超量程段10000×10-6～12000×10-6范围内的一组输出电压数据,表明在超量程段已不具有线性特征。使用最小二乘法对数据做拟合处理后,得出了超量程段的二次拟合曲线,从而达到了非线性自校正的智能化。实验表明瓦斯气体电化学传感器量程扩大20%,扩大部分测量误差0.11%。
As electrochemical sensor output in the over-range segment for the curve output, measurement error range. In this regard, the curve fitting method is proposed to be corrected, and a solution is provided for measuring the overrange of the measuring range when the gas with large concentration is over. The calibration principle and the experimental circuit are given. The gas electrochemical sensor is tested in its over- A set of output voltage data in the range of 10000 × 10-6 ~ 12000 × 10-6 indicates that there is no linear feature in the overrange segment. After fitting the data by using the least square method, the quadratic fitting curve of the over-range segment is obtained, so as to achieve the intelligence of nonlinear self-correction. Experiments show that the electrochemical gas sensor gas range expanded by 20%, expanding part of the measurement error of 0.11%.