1 中北大学 电子测试技术国家重点实验室
2 仪器科学与动态测试教育部重点实验室，山西太原 030051
由于不规则复杂狭小空间微小渗漏难以测量，急需一种便于安装、痕量级测量、快速应答、精准定位的在线监测系统。本文设计了一种基于 Visual Basic(VB)的泄漏在线监测系统，总节点以 XC6SLX16-3CSG324I为主控芯片，子节点以 STM32F103C8T6为硬件电路的主控芯片，微系统(MEMS)金属氧化物传感器 Ccs811、Bmp180、Si7021构成数据采集电路。采集电路采用柔性电路技术，以适应狭小空间贴装，便于监测；被测泄露工质可以是纯粹的气体或含有某些挥发性物质的液态。实验结果表明，该系统可实现非接触式测量、快速传感、精确定位，并可测量到挥发性有机化合物(VOC)气体浓度为 ppb量级，实现痕量级渗漏测量。
传感器 现场可编程门阵列 挥发性有机化合物气体 泄漏监测 sensor Field Programmable Gate Array(FPGA) Volatile Organic Compounds gas leakage monitoring 太赫兹科学与电子信息学报
2023, 21(8): 1043
Author Affiliations
Abstract
Science and Technology on Electronic Test & Measurement Laboratory, North University of China, Taiyuan 030051, China
A novel high sensitivity relative humidity (RH) sensor was proposed by using micro structure plastic optical fiber (POF) based on the surface plasmon resonance (SPR) effect and the evanescent wave (EW) loss. The micro structure was fabricated on the POF and coated with a gold layer and agarose, adopting the sputtering and dip-coating technique. These construction effects on the attenuation of power caused by the SPR effect and the EW loss were used to perform RH detections. The agarose’s different refractive indexes (RIs) caused fluctuations in the transmission power when the humidity increased. The demonstrated experimental results showed that the proposed sensor achieved a linear response from 20% RH to 80% RH with a high sensitivity of 0.595 μW/%. The proposed sensor had the advantages of fast response and recovery. Furthermore, the temperature dependence and the repeatability test of the sensor were also performed.
SPR evanescent wave loss agarose RH sensor Photonic Sensors
2021, 11(4): 392
1 中北大学 电子测试技术国家重点实验室, 山西 太原 030051
2 北京振兴计量测试研究所, 北京 100074
在液漏检测领域, 许多应用场合对成本敏感, 而且又对空间分辨率有相对高的要求。但目前市场上很难选配到具备厘米级空间定位能力, 而且价格低廉的液漏传感器, 造成在这一特定需求空间内的应用真空。与当前流行的单一光源定位思路不同, 文章介绍了一种多源定位的方法, 可以实现低成本, 短距离(10m)内较高的空间分辨率(5cm)。详细介绍了传感器检测与定位原理、加工方法, 以及相关工艺参数的影响。
分布式光纤传感 布里渊散射 光耦合 柔性LED灯带 液漏传感 distributed optical fiber sensing brillouin scattering OFDR OFDR optical coupling flexible LED lamp belt fluid leakage sensing
1 中北大学 仪器与电子学院 电子测试重点实验室, 山西 太原 030051
2 中北大学 仪器与电子学院 仪器科学与动态测试教育部重点实验室,山西 太原 030051
3 北京宇航系统工程研究所, 北京 100076
针对现有的准分布式光纤传感测量技术复杂、精度不高且响应时间较慢等问题, 设计出一种实时性高且成本更低的准分布式光纤传感器。传感器主要由柔性LED灯带和带有侧向耦合结构的聚合物光纤组成。侧向耦合结构被LED逐一照亮, 形成一系列传感单元。光通过侧向耦合结构入射聚合物光纤中, 当LED和耦合结构之间的介质改变时, 耦合光强增加, 光纤两端输出光强随之增加, 则可将液漏事件转化为耦合介质改变来测量。结果表明, 准分布式光纤液漏传感器具有检测和定位漏水信号的能力且定位精度小于等于10cm, 实现了液漏检测和漏点定位的功能。
光学测量 光纤传感 准分布式 液漏测量 侧面耦合 optical measurement fiber optic sensing quasi-distributed liquid leakage measurement side coupling
Author Affiliations
Abstract
Key Laboratory of Instrumentation Science & Dynamic Measurement (North University of China), Ministry of Education, Taiyuan, 030051, China
The macro-bending induced optical fiber cladding modes frustrated total internal reflection effect is used to realize the liquid level probe with a simple structure of single macro-bend polymer optical fiber loop. The test results show that the extinction ratio reaches 1.06 dB. “First bath” phenomenon is not obvious (about 0.8%). The robustness of the sensor is better, and the ability of anti-pollution is stronger compared with the conventional sensors. The process of making this sensing probe is extremely easy, and the cost is very low.
Water leakage measurement polymer optical fiber frustrated total internal reflection Photonic Sensors
2016, 6(4): 312
Author Affiliations
Abstract
1 Science and Technology on Inertial Laboratory, Beihang University, Beijing 100191, China
2 Precision Opto-mechatronics Technology Key Laboratory of Education Ministry, Beihang University, Beijing 100191, China
3 Key Laboratory of Instrumentation Science and Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China
4 Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China
Preparation and characterization of a liquid level sensor based on macro-bending coupling of fibers are demonstrated in this Letter. The sensitive component can be obtained through a twisting and twining structure of transparent cladding plastic fibers. The difference in light power originating from the surrounding media in the fibers is tested. The light power loss for different tested media and the fiber bending magnitude are investigated. The sensing measurements show that the coupling light power in the passive fiber decreases in accordance with increasing liquid level, whereas it exhibits a steady tendency in the case of the active fiber.
060.2370 Fiber optics sensors 060.2400 Fiber properties 060.2270 Fiber characterization 040.1880 Detection Chinese Optics Letters
2015, 13(8): 080601
