【作者】 李鑫；

【导师】 刘琨；

【作者基本信息】 天津大学 ， 光学工程， 2018， 硕士

【摘要】 随着科技的不断发展,光纤传感器凭借其抗电磁干扰、高灵敏度、耐高低温等特点得到广泛的关注,应用于多种参量的探测或监控之中。为了适应极端环境下力热参量的探测需求,本文设计开发了基于光纤技术的力热复合测试平台,实现对压力、温度、应变、声振动四个参量的多点探测。在综述了国内外相关领域发展现状的基础之上,本文重点开展了以下几个方面的研究工作:1.基于模块化设计开发的基本思路,提出了力热复合测试平台总体设计方案,在光纤法珀传感原理和光纤光栅传感原理的基础上,对多通道光纤压力传感子系统、光纤温度/应变传感子系统、光纤声振动传感子系统进行了研究与设计。2.实现了力热复合测试平台模块化开发,包括光路模块、驱动控制模块、数据采集与处理模块、整机结构与接口四个方面的设计与实现,规范了仪器装配与调试方法,分析总结了常见的故障原因和解决方案,保证了硬件平台的基本功能。3.针对系统噪声影响解调精度的问题,提出了一种全相位滤波降噪解调算法,利用光纤温度/应变传感子系统进行了降噪解调算法实验验证,结果显示,本算法具有良好的降噪效果,与传统质心法相比,解调稳定性提高了30%,并且能够满足实验现场实时处理的需求。4.研究了力热复合测试平台测量性能与质量特性的测试方法,检验了力热复合测试平台的多参量测量性能和多通道实时采集与处理能力,达到了环境适应性与可靠性指标要求,证明了力热复合测试平台测量的准确性和可靠性。更多还原

【Abstract】 With the continuous development of science and technology,optical fiber sensors have attracted extensive attention because of their anti-electromagnetic interference,high sensitivity,high and low temperature resistance,and have been used in the detections of various parameters.In order to meet the requirements of detecting mechanical and thermal parameters in extreme environments,we have designed and developed the mechanical & thermal multi-parameter testing platform based on optical fiber technology to realize the multi-point detection of pressure,temperature,strain and acoustic vibration.On the basis of reviewing the development status of related fields at home and abroad,the main work is as follows:1.The overall design scheme of the mechanical & thermal multi-parameter testing platform is proposed in term of the modular design idea.Based on the principle of fiber Fabry-Perot sensing and fiber grating sensing,the thesis presents the multichannel fiber optic pressure sensing subsystem,fiber optic temperature/strain sensing subsystem and fiber optic acoustic vibration sensing subsystem.2.The mechanical & thermal multi-parameter testing platform is developed on account of the modular design concept,including the design and implementation of optical circuit module,drive control module,data acquisition and processing module,and the whole machine structure and interface.The method of instrument assembly and debugging is standardized,and the common causes and solutions are analyzed and summarized,which guarantee the basic functions of the platform.3.A demodulation algorithm based on all-phase filters is proposed,in view of the problem that the noise affects the demodulation accuracy.The algorithm is verified by using the fiber optic temperature/strain sensing subsystem.The results show that the proposed algorithm has good noise reduction effect.Compared with the traditional centroid method,the demodulation stability is improved by 30%,and it can meet the real-time processing requirements of the experimental site.4.The measurement methods of measuring performance and quality characteristics of the mechanical & thermal multi-parameter testing platform are studied.We tested the multi-parameter measurement performance and the multichannel real-time acquisition and processing capability.And the environmental adaptability and the reliability index were achieved.The test results have proved that the mechanical & thermal multi-parameter testing platform can make accurate and reliable measurements.更多还原