【作者】 徐竞；

【导师】 郑龙江；

【作者基本信息】 燕山大学 ， 测试计量技术及仪器， 2003， 硕士

【摘要】 荧光光纤温度传感器是现代光纤传感技术领域研究的热点之一。许多测温场合条件特殊，对温度的测量可能造成一些实际的困难，在寻求温度传感器的其他替代手段的所有研究活动中，荧光光纤温度传感器以其抗电磁干扰、体积小、传输损耗低、耐腐蚀等优点正日益受到重视。 在对国内外研究现状进行深入分析的基础上，提出了一种基于荧光寿命的双通道的光纤温度传感器，以实现特殊环境下温度的实时测量。 论述荧光测量法的基本原理及特点，以及设计荧光光纤测温系统的总体方案。 根据红宝石晶体的荧光特性，合理选择激发光源、滤光片及光电探测器。系统采用黄绿色超高亮发光二极管作为激励光源，低损耗石英光纤束作为光信号传输通道。对光源—光纤、光纤—探测器的耦合效率进行简要分析，为激发光纤和接受光纤的合理选择提供依据。 提出一种利用锁相环技术测量荧光寿命的新方法。该方案具有锁相环路的特点，它利用相敏检波与调制技术，把荧光寿命转换成周期性输出信号，且荧光寿命与周期成正比。 荧光信号检测系统，采用硅光敏三极管作为荧光信号探测器，8031单片机来测量荧光寿命。 本研究的创新工作在于提出了基于荧光寿命的锁相测温法，系统采用与调制荧光信号相关的双光源相位锁定测量方案，实现荧光寿命在无激励光干扰情况下的实时测量。该系统具有较高的温度分辨率和灵敏度。更多还原

【Abstract】 The fluorescence optical fiber temperature sensor is one of the interested problems that are researched in the field of modern optical fiber sensor technology. The situations of measurement temperature are specially, it is difficult to measure temperature for them, and so the other temperature sensor is searched in all research. The virtues of the fluorescence optical fiber temperature sensor are electromagnetic interference resisting, little bulk, low transmission loss, corrosion resisting. More and more attention is put on the fluorescence optical fiber temperature sensor.Based on thoroughly analyzing research present situation in home and abroad, the double-channels optical fiber temperature sensor based on fluorescence lifetime is purposed. It is the aim that the fluorescence optical fiber temperature sensor realizes real time measurement temperature in special environment.The basic principle and characteristic of fluorescence measurement method are discussed, and the total scheme of fluorescence optical fiber measurement temperature system is designed.Based on the fluorescence specific properties of ruby crystal are analyzed, excitation light source, optical filter and optical detector are used reasonably. The system uses the yellow green exceeded shine luminescence diode as the excited light source. The transmission channel of light signal is the low loss silicon optical fiber bundle. The coupling between optical fiber with light source and optical detector are simply analyzed in order to provide foundation for the reasonable selection of excitation and receiving optical fiber.A novel method for the detection of fluorescence lifetime that uses the technology of the phase-locked loop is proposed. With phase-sensitive detection technique and modulation technique in this scheme, the measured fluorescence lifetime is converted to a repetitive signal whose period is directly proportional to it.The system of fluorescence measurement uses the silicon photosensitive three-electrode tube as the detection of fluorescence signal. The 8031singlechip is used to measure fluorescence lifetime.The method of phase-locked measurement temperature based on fluorescence lifetime has been proposed as the main innovation work of this research. The system uses the scheme of double sources that relative to fluorescence signal modulated and phase-locked to measure temperature. The real time measurement of fluorescence lifetime is realized under no exciting light and no interference. This system has higher temperature resolution and response.更多还原