基于LED诱导荧光和调制解调技术的机油检测及量化研究

doi:10.3964/j.issn.1000-0593(2025)10-2790-06

Abstract
References
Related Citation (15)

Download: PDF (5930 KB)
Export: BibTeX | EndNote (RIS)

Abstract 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 0.189 μL for engine oil volume at a 10 mm detection distance and a detection limit of 0.2 μm 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.

Key words：LED-induced fluorescence(LED-IF); Modulation-demodulation; Engine oil; Quantitative detection

Received: 2025-03-10 Accepted: 2025-06-13

ZTFLH:

O657.3

Corresponding Authors: JI Zhong-hua E-mail: jzh@sxu.edu.cn

Cite this article:

WANG Xin-yi,MA Wei-xin,MA Chong-hao, et al. Engine Oil Detection and Quantification Based on LED-IF Modulation-Demodulation Technology[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2025, 45(10): 2790-2795.

URL:

https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2025)10-2790-06 OR https://www.gpxygpfx.com/EN/Y2025/V45/I10/2790

[1] Wang Z, Fingas M, Page D S. Journal of Chromatography A, 1999, 843(1-2): 369.
[2] Bayona J M, Domínguez C, Albaigés J. Trends in Environmental Analytical Chemistry, 2015, 5: 26.
[3] YU Bin, WANG Zhao(余斌, 王昭). Optics & Optoelectronic Technology(光学与光电技术), 2009, 7(1): 62.
[4] Denkilkian H, Koulakezian A, Ohannessian R, et al. IEEE Transactions on Instrumentation and Measurement, 2009, 58(12): 4001.
[5] Lü Q N, Ge B Z, Yao W D, et al. Optics and Lasers in Engineering, 2011, 49(1): 13.
[6] Brown C E, Fingas M F. Marine Pollution Bulletin, 2003, 47(9-12): 477.
[7] XU Ming-da, LI Feng(徐明达, 李峰). Information Technology(信息技术), 2005, (4): 63.
[8] HUANG Xiu-li, HUANG Fei, CHEN Jia-cong, et al(黄秀丽, 黄飞, 陈嘉聪, 等). Science and Technology of Food Industry(食品工业科技), 2014, 35(14): 64.
[9] Zhang Y, Li T, Chen H, et al. Applied Optics, 2019, 58(16): 4484.
[10] KONG De-ming, LIU Ya-ru, DU Ya-xin, et al(孔德明, 刘亚茹, 杜雅欣, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2023, 43(9): 2811.
[11] Bavali A, Rahmatpanahi A, Chegini R M. Microchemical Journal, 2025, 211, 113080.
[12] Yin S, Sun F, Liu W, et al. IEEE Sensors Journal, 2023, 23(12): 13671.
[13] LIU Liang-chen, YANG Rui-fang, ZHAO Nan-jing, et al(刘梁晨, 杨瑞芳, 赵南京, 等). Acta Optica Sinica(光学学报), 2023, 43(18): 1812003.
[14] Liu Q H, Zhang Y, Wu M, et al. Journal of Food Composition and Analysis, 2025, 137: 106934.
[15] GUO Zeng-bing, ZANG Ke, HU Qin-feng(郭增冰, 臧珂, 胡勤丰). Micromotors(微电机), 2020, 53(4): 45.
[16] WANG Jian-xin, FANG Hua-wei, DUAN Xiao-yi, et al(王建新, 方华威, 段晓毅, 等). Journal of Electronics & Information Technology(电子与信息学报), 2017, 39(5): 1256.
[17] International Union of Pure and Applied Chemistry. Compendium of Analytical Nomenclature. https://media.iupac.org/publications/analytical_compendium/, 1997.