双波段红外可燃气体探测器的算法设计与实现

本文基于可燃气体吸收特定波段的红外光原理, 设计了一款红外双波段可燃气体探测器。通过分析碳氢类可燃气体分子吸收特性, 确定了可燃气体的吸收波长与参考波长, 并完成了探测器的光路部分和整体硬件电路设计。通过在高低温实验平台内某一恒定温度下, 配制 8组不同浓度的气体进行标定, 并记录下标定的数据, 生成了探测器的检测浓度计算曲线。同时, 通过对待测气体浓度为 0状态下的多组不同环境温度测试, 得出探测器受环境温度影响的特性, 引入吸收参数 H, 并建立吸收参数 H与温度的补偿表, 实现了对因温度变化所引起的检测偏差的合理补偿。实验结果表明, 该探测器的精度较好、响应快, 高低温性能稳定, 完全符合国家标准和设计要求。

Abstract

Based on the principle of combustible gas absorbing infrared light at specific bands, an infrared dual-band combustible gas detector was designed in this study. By analyzing the molecular absorption characteristics of hydrocarbon combustible gas, the absorption band and reference band of the combustible gas were determined, and the optical path and hardware circuit of the detector were designed. With the high and low temperature experimental platforms at a constant temperature, 8 groups of gases with different concentrations were prepared for calibration, and the calibrated data were recorded to generate the detection concentration calculation curve of the detector. Meanwhile, the characteristics of the detector affected by the ambient temperature were determined through the multi-group test under the condition that the measured gas concentration was 0 under different ambient temperatures. The absorption parameter H was introduced, and the compensation table of the absorption parameter H and temperature was established to achieve reasonable compensation for the detection deviation caused by temperature change. The experimental results showed that the detector has good precision, fast response, and stable performance at high and low temperatures and completely meets the national standards and design requirements.

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冯宏伟, 刘媛媛, 谢林柏. 双波段红外可燃气体探测器的算法设计与实现[J]. 红外技术, 2019, 41(3): 227. FENG Hongwei, LIU Yuanyuan, XIE Linbo. Algorithm Design and Implementation for Dual-band Infrared Combustible Gas Detector[J]. Infrared Technology, 2019, 41(3): 227.

双波段红外可燃气体探测器的算法设计与实现

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