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
1 中北大学 a.电子测试技术国家重点实验室
2 b.仪器科学与动态测试教育部重点实验室，山西 太原 030051
3 91550 部队，辽宁 大连 116018
4 北京遥测技术研究所，北京 100076
针对现有心电心音监测仪覆盖性不足、时效性差等问题，提出了一种基于无线传输的心电(ECG)心音(PCG)监护系统设计。本系统设计有64 个监护节点，各节点由传感模块、调理采集模块、存储模块、主控管理模块、通信模块、电源管理模块组成，各节点可对12 导联心电信号、HKY-06B 心音信号进行同步采集传输，将信息汇总给监护中心并及时处理与反馈，实现远程实时监护，为心血管疾病的早期诊断提供参数依据；适用于医院、社区、灾害救援现场如方舱医院等场所，保证高可靠性的同时极大提高了医护人员的工作效率。
无线传输 12 导联心电信号 HKY-06B 心音信号 远程实时监护 wireless transmission 12-lead ECG signal HKY-06B PCG signal remote real-time monitoring 太赫兹科学与电子信息学报
2022, 20(1): 85
1 北京航空航天大学 惯性技术重点实验室, 北京100191
2 北京航空航天大学 精密光机电一体化技术教育部重点实验室, 北京100191
3 中北大学 仪器科学与动态测试技术教育部重点实验室, , 山西 太原 030051
4 中北大学 电子测试技术重点实验室, 山西 太原 030051
为满足某些国家工程的发展需要, 比如说航天领域内, 液态燃料液位监测作为飞行指标考核的一个关键参数, 检测精度直接影响到各类飞行器的指标实现效率。基于塑料光纤弯曲损耗和受抑全内反原理, 设计了一种可实现单点离散与多点连续的液位传感系统。理论分析后, 使用实际器材验证理论分析, 阐述了操作原则、系统结构和技术优势, 分析了进行液位测量的可行性。根据理论分析的结果, 基于已有器材搭建了离散和连续式液位传感系统, 同时设计了一套实验装置并利用该装置对传感系统进行了验证实验。实验结果表明: 所提出的新型液位传感系统不仅可以实现液位的测量, 而且具有较好的测量一致性和易实现性。其中连续液位测量系统达到了测试量程450 mm, 测试灵敏度为0.808 3 μW/mm的液位测量。对工程应用领域的具有较好的参考意义。
光纤液位传感 光纤光学 弯曲 受抑全内反射 fiber-optic liquid level sensor optical fiber optics bend frustrated total internal reflection 红外与激光工程
2017, 46(12): 1217001
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
Author Affiliations
Abstract
1 Key Laboratory of Instrumentation Science & Dynamic Measurement (North University of China), Ministry of Education, Taiyuan, 030051, China
2 Ministry of Education and Science Technology on Electronic Test & Measurement Laboratory, Department of Electronic Science and technology, North University of China, Taiyuan, 030051, China
This paper presents a novel readout system for wireless passive pressure sensors based on the inductively coupled inductor and cavity (LC) resonant circuits. The proposed system consists of a reader antenna inductively coupled to the sensor circuit, a readout circuit, and a personal computer (PC) post processing unit. The readout circuit generates a voltage signal representing the sensor’s capacitance. The frequency of the reader antenna driving signal is a constant, which is equal to the sensor’s resonant frequency at zero pressure. Based on mechanical and electrical modeling, the pressure sensor design based on the high temperature co-fired ceramic (HTCC) technology is conducted and discussed. The functionality and accuracy of the readout system are tested with a voltage-capacitance measurement system and demonstrated in a realistic pressure measurement environment, so that the overall performance and the feasibility of the readout system are proved.
Wireless passive pressure sensors LC resonant circuits HTCC inductive coupling Photonic Sensors
2014, 4(1): 70
