基于STM32的光学水中油检测系统设计  

Design of Optical Oil-in-water Detection System Based on STM32

作　　者：李利品[1] 徐国超 黄燕群 张鹏丽 陈欢 LI Li-pin;XU Guo-chao;HUANG Yan-qun;ZHANG Peng-li;CHEN Huan(Xi an Shiyou University,Shaanxi Provincial Key Laboratory of Oil and Gas Well Measurement and Control Technology,Xi an 710065,China;Xi an Modern Control Technology Research Institute,Xi an 710065,China;Shaanxi Fenghuo Electronics Co.,Ltd.,Baoji 721006,China)

机构地区：[1]西安石油大学,陕西省油气井测控技术重点实验室,陕西西安710065 [2]西安现代控制技术研究所,陕西西安710065 [3]陕西烽火电子股份有限公司,陕西宝鸡721006

出　　处：《仪表技术与传感器》2022年第4期54-57,88,共5页Instrument Technique and Sensor

基　　金：国家自然科学基金项目(41774081);陕西省工业攻关项目(2020GY-169);陕西省教育厅重点实验室项目(20JS124);西安石油大学研究生创新与实践能力培养计划资助项目(YCS21113120)。

摘　　要：针对传统微量水中油检测系统检测精度低和体积大等问题,设计了一种基于STM32的光学水中油检测系统。系统利用矿物油的荧光效应,通过脉冲频率调制LED、微弱信号放大和数字正交锁相放大技术提取同频125 Hz的微弱荧光信号,用“一光源双探测”的光机结构消除光源对测量的影响,通过最小二乘法拟合水中油的质量浓度和相对荧光强度之间的关系,反演得到水中油的质量浓度。试验结果表明,该系统在0~60 mg/L内的水中油测量应用上具有较高精度,线性度为99.96%,为安全用水和环境保护提供了可靠依据。Aiming at the problems of low measurement accuracy and large volume of traditional trace oil-in-water detection system,an optical oil-in-water detection system based on STM32 was designed.Using the fluorescent effect of mineral oil,the system extracted the weak fluorescent signal with the same frequency at 125 Hz by pulse frequency modulation LED technology,weak signal amplification technology and digital quadrature phase-locked amplification technology.The optical-mechanical structure of“one light source and double detection”eliminated the light source influence on measurement.The relation between oil-in-water mass concentration and relative fluorescence intensity was obtained by least square method,and oil-in-water mass concentration was deduced.The experimental results show the system has high accuracy in the application of oil-in-water measurement in 0~60 mg/L,with a linearity of 99.96%,and can provide a reliable basis for safe water and environmental protection.

关 键 词：STM32 水中油检测 微弱信号 相对荧光强度 

分 类 号：TE991[石油与天然气工程—石油机械设备] TP216[自动化与计算机技术—检测技术与自动化装置]