针对非分散红外光谱传感器零点和温度漂移问题, 建立了一种基于零气光强、 参考光强、 标准温度、 环境温度、 温度漂移系数等多参数模型, 对红外传感器长期连续运行中存在的零点和温度漂移进行自动校正和补偿。 测试结果和长时间应用表明, 仪器在各种变换的环境条件下检测精度均小于5%F.S。 CO2的平均检测精度从未综合处理前的9.26%提高到了处理后的1.23%, CH4的平均检测精度从未综合处理前的10.61%提高到了处理后的0.70%, 克服了很多气体检测仪存在的稳定性差, 标定周期短等不足, 有效提高了仪器的检测精度、 稳定性, 降低了维护成本。

To non-dispersive infrared gas analysis, it was the most difficult challenge to maintain very low zero and temperature drift over long periods. Electronic and detector response drifts irremediably required some form of manual zeroing procedure. To solve zero and temperature drift, a multi-parameters model was developed, by which zero and temperature drifts were automatically corrected. These parameters include zero gas intensity, reference channels intensity, standard temperature, environment temperature, temperature drift coefficients etc. Trial results and in-situ applications showed that the monitoring precisions of the instrument were lesser than 5%F.S in different temperatures and for a long time. The average precision of monitoring carbon monoxide concentration increased respectively from 9.26% to 1.23%, and monitoring hydrocarbon concentration from 10.61% to 0.70% before and after compensated. The instrument required essentially no periodic calibration and have very low maintenance cost.