基于微波解调技术的光纤折射率阵列传感器研究
发布时间：2018-09-02 08:00
【摘要】：折射率是一个表征液体特性的重要参数,光纤折射率传感器因其抗电磁干扰能力强、探头微型化等一系列优点而备受关注,使得其在生物医学和环境监测等领域有着广泛的应用。针对目前光纤折射率传感器结构复杂、集成度差等问题,本文研制了一种光纤折射率阵列传感器,该阵列可实现传感器的多功能化以及解决交叉敏感等问题。本文还基于微波解调技术搭建了一套折射率阵列传感器解调系统,并使用该系统来实现折射率传感。本文研究的主要内容如下:(1)本文对光载波的微波测量技术进行了理论分析,并通过仿真验证了该技术的可行性。在理论分析和仿真的基础上,搭建了一套用于折射率阵列传感器的解调系统。(2)使用去噪算法对信号做处理,并对该解调系统进行了性能分析。本文使用累加平均和小波变换两种算法对解调信号进行了去噪处理,对比去噪前后信号,累加平均和小波变换对噪声有较好的抑制作用。(3)用搭建好的系统来解调光纤折射率阵列传感器,并做了液体折射率测量实验。本文提出了一种自校准结构来提高测量精度,并制作了自校准传感器。本文中的折射率传感器是基于菲涅尔反射型的,采用一个1×8的光纤分路器来实现传感器阵列的并联复用,从而实现了折射率阵列传感器的8通道同时测量。实验结果表明由此解调的折射率传感器灵敏度可达4.228mV/RIU,线性度约为0.989,并具有良好的稳定性和重复性。由于本文提出的解调技术是基于强度解调,因此易受光源波动和传感光纤振动等干扰,为此提出了一种自校准结构。自校准结构就是制作一种具有两个反射面的传感器,一个反射面位于光纤内作为参考面,一个反射面作为测量面,将两个反射信号的反射强度相除便可以消除波动的干扰,实验结果表明自校准传感器可使测量精度由0.052%提高到0.015%,线性度由0.9888提高到0.9996。
[Abstract]:Refractive index is an important parameter to characterize liquid properties. Optical fiber refractive index sensor has attracted much attention because of its strong ability to resist electromagnetic interference and miniaturization of probe. It has been widely used in biomedicine and environmental monitoring. Aiming at the problems of complex structure and poor integration of optical fiber refractive index sensor, a kind of optical fiber refractive index array sensor is developed in this paper, which can realize the multi-function of the sensor and solve the problem of cross-sensitivity. A refractive index array sensor demodulation system is built based on microwave demodulation technology, and the system is used to realize refractive index sensor. The main contents of this paper are as follows: (1) the microwave measurement technology of optical carrier is theoretically analyzed, and the feasibility of the technique is verified by simulation. On the basis of theoretical analysis and simulation, a demodulation system for refractive index array sensor is built. (2) the signal is processed by denoising algorithm, and the performance of the demodulation system is analyzed. In this paper, the demodulation signal is de-noised using the accumulative average algorithm and the wavelet transform algorithm, and the signal before and after denoising is compared. Accumulative average and wavelet transform can suppress noise. (3) Fiber-optic refractive index array sensor is demodulated with a good system, and the liquid refractive index measurement experiment is done. In this paper, a self-calibration structure is proposed to improve the measurement accuracy, and a self-calibration sensor is made. The refractive index sensor in this paper is based on Fresnel reflection type. A 1 脳 8 optical fiber splitter is used to realize the parallel multiplexing of the sensor array, thus the 8 channel simultaneous measurement of the refractive index array sensor is realized. The experimental results show that the sensitivity of the demodulated refractive index sensor is 4.228 MV / RIU.The linearity is about 0.989, and the sensor has good stability and repeatability. Because the demodulation technique proposed in this paper is based on intensity demodulation, it is easy to be interfered by the fluctuation of light source and the vibration of sensing fiber. Therefore, a self-calibration structure is proposed. The self-calibrating structure is to make a sensor with two reflectors, one of which is located in the optical fiber as the reference plane and the other as the measuring plane. The interference of the wave can be eliminated by dividing the reflection intensity of the two reflected signals. The experimental results show that the self-calibration sensor can improve the measurement accuracy from 0.052% to 0.015% and the linearity from 0.9888 to 0.9996.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP212
本文编号：2218751
[Abstract]:Refractive index is an important parameter to characterize liquid properties. Optical fiber refractive index sensor has attracted much attention because of its strong ability to resist electromagnetic interference and miniaturization of probe. It has been widely used in biomedicine and environmental monitoring. Aiming at the problems of complex structure and poor integration of optical fiber refractive index sensor, a kind of optical fiber refractive index array sensor is developed in this paper, which can realize the multi-function of the sensor and solve the problem of cross-sensitivity. A refractive index array sensor demodulation system is built based on microwave demodulation technology, and the system is used to realize refractive index sensor. The main contents of this paper are as follows: (1) the microwave measurement technology of optical carrier is theoretically analyzed, and the feasibility of the technique is verified by simulation. On the basis of theoretical analysis and simulation, a demodulation system for refractive index array sensor is built. (2) the signal is processed by denoising algorithm, and the performance of the demodulation system is analyzed. In this paper, the demodulation signal is de-noised using the accumulative average algorithm and the wavelet transform algorithm, and the signal before and after denoising is compared. Accumulative average and wavelet transform can suppress noise. (3) Fiber-optic refractive index array sensor is demodulated with a good system, and the liquid refractive index measurement experiment is done. In this paper, a self-calibration structure is proposed to improve the measurement accuracy, and a self-calibration sensor is made. The refractive index sensor in this paper is based on Fresnel reflection type. A 1 脳 8 optical fiber splitter is used to realize the parallel multiplexing of the sensor array, thus the 8 channel simultaneous measurement of the refractive index array sensor is realized. The experimental results show that the sensitivity of the demodulated refractive index sensor is 4.228 MV / RIU.The linearity is about 0.989, and the sensor has good stability and repeatability. Because the demodulation technique proposed in this paper is based on intensity demodulation, it is easy to be interfered by the fluctuation of light source and the vibration of sensing fiber. Therefore, a self-calibration structure is proposed. The self-calibrating structure is to make a sensor with two reflectors, one of which is located in the optical fiber as the reference plane and the other as the measuring plane. The interference of the wave can be eliminated by dividing the reflection intensity of the two reflected signals. The experimental results show that the self-calibration sensor can improve the measurement accuracy from 0.052% to 0.015% and the linearity from 0.9888 to 0.9996.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP212
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