光干涉甲烷检测器的光路改进与零点补偿

发布时间：2018-10-31 20:48

【摘要】：光干涉甲烷检测器具有稳定可靠性强、测量范围宽等优点,但现有设备都采用人工读数方式,自动化程度低,不能连接到煤矿监控系统。针对该问题,提出了一种基于测量干涉条纹光强的改进方法。通过改进光路设计,保证了甲烷体积分数与光强变化之间对应关系的惟一性。使用光电元件采集干涉条纹,根据干涉条纹的光强变化得到甲烷体积分数。针对光干涉甲烷检测器的零点受外界环境因素影响而发生漂移的问题,首先通过理论分析得到了外界气压与测量误差之间的关系模型,并使用该模型对外界气压变化进行补偿;然后由实验得到温度与测量误差之间的关系,采用线性插值方法建立温度补偿模型。最后通过精度实验、压强实验、温度实验和长期稳定性实验验证了所设计的补偿模型的有效性和系统的稳定性。
[Abstract]:The light interference methane detector has the advantages of strong stability and reliability and wide measuring range. However, the existing equipments are manual reading, and the degree of automation is low, which can not be connected to the coal mine monitoring system. To solve this problem, an improved method based on measuring the intensity of interference fringes is proposed. By improving the optical path design, the uniqueness of the corresponding relation between the volume fraction of methane and the variation of light intensity is ensured. The interference fringes are collected by photoelectric elements and the methane volume fraction is obtained according to the light intensity variation of the interference fringes. Aiming at the problem that the zero point of light interference methane detector is drifted by external environmental factors, the model of relationship between external pressure and measurement error is obtained by theoretical analysis, and the model is used to compensate for the change of external pressure. Then the relationship between temperature and measurement error is obtained by experiments, and the temperature compensation model is established by linear interpolation method. Finally, the validity of the compensation model and the stability of the system are verified by precision experiment, pressure experiment, temperature experiment and long-term stability experiment.
【作者单位】：中国科学院自动化研究所复杂系统管理与控制国家重点实验室;北京信息职业技术学院电子工程系;
【基金】：国家高技术研究发展计划(863)资助项目(2013AA041002-1) 国家“十二五”科技支撑计划资助项目(2013BAF07B05-2)
【分类号】：TD712

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