新型波长解调技术在干涉型光纤传感器输出解调中的应用

发布时间：2018-03-03 17:34

本文选题：波长解调　切入点：边缘滤波法　出处：《光谱学与光谱分析》2017年09期 　论文类型：期刊论文

【摘要】：提出了一种改进型边缘滤波波长解调技术,解决干涉型或谐振型光纤传感器输出的干涉谱波长的快速解调问题。该波长解调技术基于啁啾光栅和长周期光栅的光谱特点,以啁啾光栅作为矩形滤波器,提取传感器输出干涉谱的一个干涉峰;以长周期作为边缘滤波器,将干涉峰的波长信息转化为光强信息进行检测。该波长解调技术波长解调范围为传感器输出干涉谱的一个自由光谱范围(FSR),解调速度快,克服了当前波长解调技术中存在的测量范围与测量速度难以同时提高的问题,同时还具有系统成本低,体积小,能够灵活多路扩展的特点。详细介绍了解调系统的工作原理以及系统结构,并将其实际应用于一种干涉型光纤电流传感器输出干涉谱的波长解调中。通过实验证明电流传感器工作在工频及脉冲电流(脉冲宽度25μs)情况下,该解调系统对传感器输出干涉谱具有准确、快速的解调效果。该研究对推进干涉或谐振型光纤传感器的实际工程化水平的提高具有重要意义。
[Abstract]:An improved edge filter wavelength demodulation technique is proposed to solve the problem of fast demodulation of interference spectrum wavelength output from interferometric or resonant fiber optic sensors. The wavelength demodulation technique is based on the spectral characteristics of chirped grating and long period grating. The chirped grating is used as a rectangular filter to extract an interference peak of the sensor output interference spectrum, and a long period of time is used as the edge filter. The wavelength information of the interference peak is converted into light intensity information for detection. The wavelength demodulation range of the wavelength demodulation technique is a free spectrum range of the sensor output interference spectrum and the demodulation speed is fast. It overcomes the problem that the measurement range and the measuring speed are difficult to increase simultaneously in the current wavelength demodulation technology, and at the same time, it has the advantages of low system cost and small volume. The principle and structure of the demodulation system are introduced in detail. It is applied to the wavelength demodulation of an interferometric fiber optic current sensor output interference spectrum. It is proved by experiments that the current sensor works at the condition of power frequency and pulse current (pulse width 25 渭 s). The demodulation system has an accurate and fast demodulation effect on the output interference spectrum of the sensor, and the research is of great significance to the improvement of the practical engineering level of the interferometric or resonant fiber optic sensor.
【作者单位】：西安交通大学电力设备电气绝缘国家重点实验室;
【基金】：国家自然科学基金项目(51377125) 高等学校博士学科点专项科研基金项目(20110201110059)资助
【分类号】：TP212

【相似文献】