光纤光栅在车辆动态称重系统中的应用研究
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摘要
光纤光栅传感技术是上世纪九十年代兴起的一种新型传感技术。由于光纤光栅可以实现多点多参量分布式传感,且具有灵敏度高、结构小、信号传输损耗极小、抗电磁干扰能力强、耐腐蚀等优点,因此光纤光栅传感技术在很多领域得到了广泛的研究和应用。
本文以长安大学青年科学基金项目为背景,对光纤光栅传感技术进行了全面的研究,并将光纤光栅传感技术应用于公路车辆动态称重系统。论文主要工作如下:
1)研究了光纤光栅传感的基础理论,介绍了其制作技术,阐述了光纤光栅传感技术的进展和应用现状;
2)利用耦合模理论对光纤光栅光谱特性进行了研究,探讨了常见的光纤光栅波长解调技术,对各种解调技术性能进行了比较研究。在理论分析的基础上,建立了光纤光栅传感模型,并对光纤光栅的应变和温度特性进行了实验研究;
3)研究了车辆动态称重技术,对国内外普遍采用的车辆动态称重系统的特点及存在的问题进行了分析,设计了一种基于光纤光栅传感技术的车辆动态称重系统方案。实验结果表明,该系统测量精度高,有效可行;
4)基于匹配滤波技术,制作了测量精度高、经济成本低的数字化光纤光栅波长解调器,并对光纤光栅系统中的传感器进行了制作和实验研究。实验测试结果证明,单个匹配光栅的波长探测范围为4nm,波长探测的分辨率为1pm,不确定度为5pm,该波长解调器达到了目前波长解调技术的先进水平。
The technology of the fiber grating sensing is a new sensing technology,which grew up in 1990's.Since fiber gratings can realize the multi-dot,multi-parameter and distributed sensing,and have some advantages such as high sensitivity,compact structure,low loss in signal transmission,good ability of anti-electromagnetic disturbance and corrosion resistance. The fiber grating sensing technology is developed and widely applied in many fields.
Combining with the Young Expert Foundation Item of Chang'an University(YEFICU), the overall research on the fiber grating sensing technology was studied in the dissertation. The design and experiments are carried out for vehicle weigh-in-motion system,adopting the fiber grating sensing technology.The main contributions are as follows.
1) The basic theory of fiber gratings and sensing are studied,and the fabrication technique is introduced in the dissertation.The progress and the current situation of fiber grating sensing technology applications are elaborated.
2) The spectral characteristics of fiber grating are analyzed using the coupling-mode theory.Several common fiber grating wavelength demodulation technologies are investigated and comparisons are carried for each demodulation technologies.Based on the theoretical analysis,a sensing model of fiber gratings was established,and the strain and temperature properties of fiber gratings are also investigated.
3) The vehicle weigh-in-motion technology is studied.The characteristics and the existing problems of the vehicle weigh-in-motion systems available used in nation and abroad are analyzed.A new scheme of vehicle weigh-in-motion system based on fiber grating sensing technology.The experiment results show that this system is with higher measuring accuracy and is effective and practical.
4) Based on matched filtering technology,a digitalized fiber grating wavelength demodulators with high measuring accuracy and low cost.The sensors used in the fiber grating system are studied and made.The experiment results indicate that the wavelength detection range of single matched fiber grating is 4nm,and the resolution of the wavelength detection is 1pm,and the uncertainty is 5pm,which put up with the advanced level of the wavelength demodulation technology.
本文以长安大学青年科学基金项目为背景,对光纤光栅传感技术进行了全面的研究,并将光纤光栅传感技术应用于公路车辆动态称重系统。论文主要工作如下:
1)研究了光纤光栅传感的基础理论,介绍了其制作技术,阐述了光纤光栅传感技术的进展和应用现状;
2)利用耦合模理论对光纤光栅光谱特性进行了研究,探讨了常见的光纤光栅波长解调技术,对各种解调技术性能进行了比较研究。在理论分析的基础上,建立了光纤光栅传感模型,并对光纤光栅的应变和温度特性进行了实验研究;
3)研究了车辆动态称重技术,对国内外普遍采用的车辆动态称重系统的特点及存在的问题进行了分析,设计了一种基于光纤光栅传感技术的车辆动态称重系统方案。实验结果表明,该系统测量精度高,有效可行;
4)基于匹配滤波技术,制作了测量精度高、经济成本低的数字化光纤光栅波长解调器,并对光纤光栅系统中的传感器进行了制作和实验研究。实验测试结果证明,单个匹配光栅的波长探测范围为4nm,波长探测的分辨率为1pm,不确定度为5pm,该波长解调器达到了目前波长解调技术的先进水平。
The technology of the fiber grating sensing is a new sensing technology,which grew up in 1990's.Since fiber gratings can realize the multi-dot,multi-parameter and distributed sensing,and have some advantages such as high sensitivity,compact structure,low loss in signal transmission,good ability of anti-electromagnetic disturbance and corrosion resistance. The fiber grating sensing technology is developed and widely applied in many fields.
Combining with the Young Expert Foundation Item of Chang'an University(YEFICU), the overall research on the fiber grating sensing technology was studied in the dissertation. The design and experiments are carried out for vehicle weigh-in-motion system,adopting the fiber grating sensing technology.The main contributions are as follows.
1) The basic theory of fiber gratings and sensing are studied,and the fabrication technique is introduced in the dissertation.The progress and the current situation of fiber grating sensing technology applications are elaborated.
2) The spectral characteristics of fiber grating are analyzed using the coupling-mode theory.Several common fiber grating wavelength demodulation technologies are investigated and comparisons are carried for each demodulation technologies.Based on the theoretical analysis,a sensing model of fiber gratings was established,and the strain and temperature properties of fiber gratings are also investigated.
3) The vehicle weigh-in-motion technology is studied.The characteristics and the existing problems of the vehicle weigh-in-motion systems available used in nation and abroad are analyzed.A new scheme of vehicle weigh-in-motion system based on fiber grating sensing technology.The experiment results show that this system is with higher measuring accuracy and is effective and practical.
4) Based on matched filtering technology,a digitalized fiber grating wavelength demodulators with high measuring accuracy and low cost.The sensors used in the fiber grating system are studied and made.The experiment results indicate that the wavelength detection range of single matched fiber grating is 4nm,and the resolution of the wavelength detection is 1pm,and the uncertainty is 5pm,which put up with the advanced level of the wavelength demodulation technology.
引文
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