【作者】 韦波；

【导师】 张燕君；

【作者基本信息】 燕山大学 ， 微电子与固体电子学， 2010， 硕士

【摘要】 光纤布拉格光栅具有抗电磁干扰能力强,稳定性好,测量现场不带电,测量范围广,易于组成传感网络等特点,现已被广泛应用于建筑、桥梁、医疗和电力等各个领域。但是,光纤布拉格光栅的波长解调技术仍然是其进一步发展的主要障碍,是光纤光栅传感领域的最大的难点之一。通过深入调研光纤光栅的国内外研究现状,把握当前光纤光栅的发展趋势,明确了研究的方向。首先,采用耦合模理论系统分析了布拉格光栅温度及应变的敏感特性。其次,比较了几种布拉格光栅的波长解调方法,选择可调谐法布里一珀罗腔滤波法作为系统波长解调的方案,并设计了光路。在信号处理系统中,设计的FFP-TF控制电路,可对FFP-TF无失真的精准控制;设计的高精度光电检测电路,可实现nW级的光功率检测;设计的波长解调算法,可实现系统的同步。最后,采用嵌入式系统作为布拉格光栅波长解调的系统平台。通过比较最终选择STM32平台。使用VC++编写了上位机监控软件,用于显示监控界面。另外,为了适应便携式的需要,还设计了基于LCD触摸显示屏的手持式波长解调系统。实验表明,系统的测温精度为1℃,响应时间1 s以内,运行稳定、可靠、可扩展性强,可以满足实际工程测量的需要。更多还原

【Abstract】 Fiber Bragg Grating with the characteristic of anti-electromagnetic interference, good stability, measurement site without electricity, wide measurement range, easy to form sensor networks, has been widely used in buildings, bridges, health care and Power sector and other fields. However, the fiber Bragg grating wavelength demodulation technology is still the main obstacle for its further development. It is one of the largest difficulties in the field of fiber grating sensor.Through in-depth investigating of current research status of fiber grating, and grasp the current trends, we have a clear direction of the study. Firstly, by using coupled mode theory, we analyze the sensitivity of the Bragg grating in temperature and strain. Secondly, in this paper we analyze several Bragg grating wavelength demodulation method, we have selected the fiber Fabry-Perot tunable wavelength demodulation filter program as the system solution and designed the optical system. In terms of signal processing systems, we design a FFP-TF controller, which can control FFP-TF accurately without distortion. We have designed high-precision photo detector that can be realized nw-level optical power detection. We design a complete wavelength demodulation synchronization algorithm which can achieve system synchronization. Finally, we use an embedded system as a Bragg grating wavelength demodulation system platform. STM32 system platform was determined by comparing the different platforms. We design a monitoring software for the Bragg grating wavelength demodulation to show results based on VC++. In order to meet portable needs, a handheld wavelength demodulation system is designed based on LCD touch-screen.The experiments result show that the FBG demodulation system with accuracy of 1℃in temperature measurement, the response time less than 1s, the system is stable, reliable, scalable, can meet the needs of the engineering measurements.更多还原