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为提高红外甲烷传感器的精度,对气室结构、电路和数据处理进行了优化设计。通过实验和光学仿真对红外气体传感器气室结构进行了重新优化设计,确定了最佳尺寸;采用三级差动放大电路设计滤除噪声;在数据处理的算法上,选用二次插值查表法来拟合方程处理数据等一系列举措设计出新的红外甲烷传感器。在甲烷浓度为0%~3%的体积分数段内对传感器进行随机测试,新传感器的反应时间能够控制在20 s以内,探测器灵敏度得到提高,测量误差控制在±0.04%。与国内外相似的产品相比,优化的传感器在高灵敏度、测量误差和反应时间上都达到了较高水平。
In order to improve the accuracy of the infrared methane sensor, the gas cell structure, circuit and data processing are optimized. Through the experiment and optical simulation, the gas cell structure of the infrared gas sensor is re-optimized and the optimal size is determined. The three-stage differential amplifier is designed to filter the noise. In the data processing algorithm, the quadratic interpolation look- To fit the equations to process data and a series of initiatives to design a new infrared methane sensor. The sensor is randomly tested within the volume fraction of methane concentration from 0% to 3%. The reaction time of the new sensor can be controlled within 20 s, the sensitivity of the detector is improved, and the measurement error is controlled within ± 0.04%. Compared with similar products at home and abroad, the optimized sensor achieves a high level of sensitivity, measurement error and reaction time.