摘要
针对机械制造行业中机油泄露检测的需求,提出了一种基于LED诱导荧光(LED-IF)与调制解调技术相结合的高灵敏度检测方法并做了量化研究,设计并建立了适用于一般自然光条件下的机油检测系统。具体地,利用出光口光功率为20 mW、波长为365 nm的LED激发机油样品,采用光电探测器探测处于410~460 nm的辐射荧光,作为机油检测依据。采用滤光片和二色镜分别对光源和荧光频率进行纯化,这一方法可以有效降低来自环境光源对机油荧光信号的干扰。为了进一步增强微弱荧光信号的检测灵敏度,引入调制解调技术,使滑动滤波窗口数据量、调制幅度、调制频率和增益因子达到最佳参数配置来优化系统性能。此时相比于未采用调制解调技术,信噪比提高了70 dB。基于LED-IF调制解调技术,进而研究了对机油容积和油膜厚度的量化检测。在10 mm的检测距离下,机油容积的检出限可以达到0.189μL,在内径为32 mm的水上可检测的机油油膜厚度检出限为0.2μm。实验测试结果不仅验证了LED-IF调制解调技术在微量机油量化检测中的有效性,还展示了该系统在自然光环境下的应用潜力。与传统的激光诱导荧光结合光谱仪的检测技术相比,该方案具有更低的成本、更小的体积和更高的安全性。
To address the demand for engine oil leakage detection in mechanical manufacturing,this study proposes a high-sensitivity detection method combining LED-induced fluorescence(LED-IF)with modulation-demodulation technology,supported by quantitative analysis.A compact engine oil detection system operable under ambient natural light conditions was designed and implemented.Specifically,a 365 nm LED with an optical power of 20 mW at the output port was employed to excite engine oil samples,while a photodetector measured fluorescence emissions within the 410~460 nm range as the detection criterion.Optical filters and dichroic mirrors were utilized to purify the excitation light and fluorescence frequencies,effectively eliminating interference from ambient light sources on engine oil fluorescence signals.To further enhance sensitivity for weak fluorescence detection,modulation-demodulation technology was introduced to optimize system performance through parameter configuration of sliding filter window data volume,modulation amplitude,modulation frequency,and gain factor.This approach achieved a 70 dB improvement in signal-to-noise ratio compared to systems without modulation-demodulation.Based on the LED-IF modulation-demodulation framework,quantitative detection of engine oil volume and film thickness was investigated.Experimental results demonstrated a detection limit of 0.189μL for engine oil volume at a 10 mm detection distance and a detection limit of 0.2μm for engine oil film thickness on a water surface with a 32 mm inner diameter.These findings validate the effectiveness of the LED-IF modulation-demodulation technology in trace engine oil quantification and highlight its practical potential in natural light environments.Compared to conventional laser-induced fluorescence combined with spectrometer-based techniques,this solution offers a lower cost,a more compact footprint,and enhanced safety.
作者
王馨懿
马伟鑫
马崇皓
王伟
权家祥
姬中华
赵延霆
WANG Xin-yi;MA Wei-xin;MA Chong-hao;WANG Wei;QUAN Jia-xiang;JI Zhong-hua;ZHAO Yan-ting(Institute of Laser Spectroscopy Shanxi University,State Key Laboratory of Quantum Optics Technologies and Devices,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China;Wuxi Hymos Intelligent Technology Co.,Ltd.,Wuxi 214112,China)
出处
《光谱学与光谱分析》
2025年第10期2790-2795,共6页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(12034012,12274272)
国家重点研发计划项目(2022YFA1404201)
无锡高新区(新吴区)科技领军人才创新创业项目资助。
作者简介
王馨懿,女,1999年生,山西大学激光光谱研究所光量子技术与器件全国重点实验室硕士研究生,e-mail:wxy9991113@163.com;通讯作者:姬中华,E-mail:jzh@sxu.edu.cn。
