用于光纤传感的激光器波长控制器的设计与开发毕业设计说明书.docx

毕业设计说明书
用于光纤传感的激光器波长控制器的设计与开发
用于光纤传感的激光器波长控制器的设计与开发
摘要
随着光纤传感系统智能化的发展,对光纤传感系统中的激光器工作性能的要求越来越高,需要对激光器的工作状态进行实时监测和控制,特别是建立基于计算机的数字化控制方式的激光器波长控制器实现对激光器的波长控制,对光纤传感系统的实现具有重要意义。将虚拟仪器技术运用于光纤传感系统当中正符合光纤传感技术智能化的发展方向,同时利用计算机强大的软件功能提高光纤传感系统开发效率和降低开发成本。因此,本文采用虚拟仪器软件开发平台对激光器波长控制器进行设计与开发。
首先,本文首先对光纤传感技术的国内外发展概况作了简要介绍,从光纤传感的原理出发论述了光纤传感系统的基本组成。在此基础上,着重介绍了光纤传感系统中常用光源——分布反馈式激光器,详细阐述了分布反馈式激光器的结构特点、工作原理以及波长调谐特性,并对激光控制器作了介绍。
其次,根据ITC4001激光控制器的功能特性,结合虚拟仪器技术,建立了一套基于LabVIEW虚拟仪器技术的激光器波长控制器软件系统。该软件系统可分为三大部分,第一部分用于建立激光控制器与PC机之间的通信;第二部分用于读取和控制激光器各参数;第三部分是系统最重要的组成部分,用于实现激光器波长的读取和反馈控制。最终根据以上三部分各功能模块,设计了相应的虚拟仪器软件界面。
最后,通过搭建的光纤传感系统实验测试平台,验证了基于虚拟仪器技术的激光器波长控制软件系统的可行性。
关键词:光纤传感,激光器波长控制,虚拟仪器,LabVIEW
Design and Development of Laser Wavelength Controller for Fiber Optical Sensor
Abstract
With the development of intelligent fiber-optic sensor system, the laser with higher performance is required, and the operation condition of the laser is demanded to be real-time monitored and controlled. To that end, it is of special importance to develop a laser wavelength controller based on digitized control mode puters. The application of virtual instrument technology in fiber-optic sensor system meets the trend of development of fiber optical sensing technique toward intelligence. Moreover, computer’s powerful software function helps to improve the efficiency and decrease the cost of development. Therefore, the laser wavelength controller based on virtual instrument is designed and developed in this paper.
First of all, the development of fiber optical sensing technique at home and abroad is introduced. Then the ponents and the theoretical principle of a fiber-optic sensor system is described. On these base, the distributed feedback (DFB) laser, monly used light source in a fiber-optic sensor system, is emphatically introduced with a detailed description of its structure, working principle, and wavelength tuning property. Also the controller of the DFB laser is introduced.
Next, according to the funct