清洁压空对在线红外水分仪检测准确性的影响

王中山

摘 要：为解决生产过程中在线红外水分仪检测探头蒙尘及结露现象，使用固定范围内的清洁压空不间断地对其进行吹扫清洁，可有效提高在线红外水分仪对不同水分下烟丝检测的准确性和稳定性，利于物料水分的在线检测与控制。运用单因素多水平试验的方法，选择卷烟制丝生产线上3种不同物料状态和水分的样品，比较清洁压空使用量对其各自在线红外水分仪检测结果影响程度，进一步确定出对提高水分仪检测准确性最适宜的清洁压空使用量。通过对梯度测试结果进行比较分析，得出适宜的清洁压空使用量为0.033～0.066 MPa。

关键词：清洁压空;红外水分仪;检测误差

中图分类号：TS439.3文献标识码：A文章编号：1003-5168（2021）01-0028-04

Abstract： In order to solve the phenomenon of dust and condensation on the detection probe of the online infrared moisture meter in the production process， the cleaning pressure within a fixed range was used in the production process to continuously purge and clean it， which could effectively improve the on-line infrared moisture meter to cut tobacco under different moisture levels. The accuracy and stability of the detection were conducive to the online detection and control of material moisture. In this paper， using the method of single factor and multi-level test， three kinds of samples with different material states and moisture content in the cigarette making production line were selected to compare the influence of the usage of clean air on the detection results of their respective on-line infrared moisture meter， and further determine the most appropriate usage of clean air for improving the detection accuracy of moisture meter.Comparing and analyzing the results of the gradient test， it was concluded that the appropriate amount of clean air pressure was 0.033～0.066 MPa.

Keywords： clean compressed air;infrared moisture meter;detection error

在線红外水分仪是用特定波长的红外光照射物料，物料中含水量越多，吸收红外光的能量也越多，进而通过测量反射光的减少量来计算物料的水分[1]，被广泛应用于食品加工、卷烟制丝等生产线的物料含水率监测[2]。在线红外水分仪对于监控产品质量和自动化生产具有重要作用[3]。但物料的表面状态、颜色、结构等不同的吸收特性及发散特性因素，以及不同安装位置、不同物料状态、不同测试环境等各种不同的外部因素，会影响红外线的反射率，从而干扰水分的准确测量[4]。消除此类影响因素的手段之一，就是在生产时使用清洁压空对在线红外水分仪探头进行不间断的吹扫清洁[5]，以保证探头的干净程度。查阅相关加工技术标准等资料，均没有对水分仪清洁压空压力设置参数的要求。……