基于Sagnac环U型单模偏芯光纤传感的研究
发布时间：2018-12-20 10:19
【摘要】：在众多检测领域,液位和温度的传感检测占据着重要地位,相应的检测手段也多种多样。相比于传统电类传感器,光纤传感器所具有的传感优势使得其发展迅速且应用广泛。其中,单模光纤偏芯熔接所形成的模间干涉与Sagnac环相搭配,用于相关环境参量的传感可以得到高干涉消光比,更高的干涉消光比可得到更高的测量灵敏度,故而使其成为了光纤传感领域的热点研究方向。本文研究基于Sagnac环的单模偏芯光纤经U型弯曲改造所形成的传感器,对其各项特性进行实验研究分析,并进一步研究其液位和温度的测量应用。该传感器成本低廉、制作简单、操作方便,有着较好的应用前景。本文的工作主要包括以下内容:1、介绍光纤传感和相关理论分析。(1)介绍论文的研究背景及意义、光纤的分类、光纤传感器的分类、干涉型光纤传感器的优点、目前光纤传感器所面临的主要问题及国内外研究概况。(2)介绍单模偏芯光纤干涉型传感器模间干涉的相关理论。(3)理论说明Sagnac环可提高干涉消光比,并经实验验证。2、对本文的传感器的多项特性做实验分析。传感器结构特性:(1)基于Sagnac环单模偏芯光纤传感器的实验干涉图谱与偏芯熔接点个数、Sagnac环的形状密切相关。(2)单位波长段内的波谷个数与传感臂的长度密切相关,而熔接点偏芯量及Sagnac环的形状对其不存在明显影响。传感器传感特性:(1)温度的变化使得该传感器干涉谱线发生变动。(2)传感器所受压力的变化不会对干涉谱线造成大的影响。(3)经仿真模拟,包层处光功率的损耗会随外界折射率增大而增大。另外,传感器经长时间浸泡,干涉谱线功率会持续下降,但随着时间的推移而稳定下来,各波谷中心波长没随时间的增加有显著的波动。3、为了进一步探究该传感器,将该传感器用于液位和温度的测量研究。实验表明:这两个环境参量与干涉波谷中心波长存在着良好的传感响应关系。利用相应的方法减弱了实验中的粗大误差,避免了挑选波谷,提高了实验效率。实验数据经相应方法处理后,液位灵敏度为1.72nm/cm,温度灵敏度为0.689 nm/℃。
[Abstract]:In many fields, the sensor detection of liquid level and temperature occupies an important position, and the corresponding detection methods are also various. Compared with traditional electrical sensors, optical fiber sensors have the advantages of rapid development and wide application. Among them, the interference formed by single-mode fiber core splicing is matched with the Sagnac ring, and the sensor used for the related environmental parameters can obtain high interference extinction ratio, and the higher interference extinction ratio can get higher measurement sensitivity, and the higher the interference extinction ratio is, the higher the measurement sensitivity is, and the higher the interference extinction ratio is, the higher the measurement sensitivity is. Therefore, it has become a hot research direction in the field of optical fiber sensing. In this paper, the sensor based on Sagnac ring is studied, which is formed by U-shaped bending modification of single-mode biased fiber. The characteristics of the sensor are analyzed experimentally, and the application of liquid level and temperature measurement is further studied. The sensor has the advantages of low cost, simple fabrication and convenient operation. The main contents of this paper are as follows: 1. Introduce the optical fiber sensor and related theoretical analysis. (1) introduce the research background and significance of the paper, the classification of optical fiber, the classification of optical fiber sensor, the advantages of interferometric optical fiber sensor, The main problems faced by optical fiber sensors and the research situation at home and abroad are introduced. (2) the theory of intermodal interference of single-mode bias fiber interferometric sensor is introduced. (3) the theory shows that Sagnac loop can improve the extinction ratio of interference. And through the experimental verification. 2, the sensor's many characteristics are analyzed experimentally. The structural characteristics of the sensor are as follows: (1) based on the experimental interference pattern of the Sagnac ring single-mode bias fiber sensor and the number of core fused contact points, the shape of the Sagnac ring is closely related to the shape of the Sagnac ring. (2) the number of troughs in the unit wavelength band is closely related to the length of the sensing arm. However, the amount of core deviation and the shape of the Sagnac ring have no obvious influence on it. Sensor sensing characteristics: (1) the temperature change makes the sensor interference spectrum line change. (2) the change of the sensor pressure will not have a great impact on the interference spectrum line. (3) after simulation, The loss of optical power in the cladding increases with the increase of refractive index. In addition, after a long immersion, the power of the interference line will continue to decrease, but with the passage of time, the central wavelength of each trough does not fluctuate significantly with the increase of time. 3, in order to further explore the sensor, The sensor is used to measure the liquid level and temperature. The experimental results show that there is a good sensing response relationship between the two environmental parameters and the central wavelength of the interference trough. By using the corresponding method, the gross error in the experiment is reduced, the selection of troughs is avoided, and the experimental efficiency is improved. After the experimental data were processed by the corresponding method, the liquid level sensitivity was 1.72 nm / cm and the temperature sensitivity was 0.689 nm/ 鈩，
本文编号：2387852
[Abstract]:In many fields, the sensor detection of liquid level and temperature occupies an important position, and the corresponding detection methods are also various. Compared with traditional electrical sensors, optical fiber sensors have the advantages of rapid development and wide application. Among them, the interference formed by single-mode fiber core splicing is matched with the Sagnac ring, and the sensor used for the related environmental parameters can obtain high interference extinction ratio, and the higher interference extinction ratio can get higher measurement sensitivity, and the higher the interference extinction ratio is, the higher the measurement sensitivity is, and the higher the interference extinction ratio is, the higher the measurement sensitivity is. Therefore, it has become a hot research direction in the field of optical fiber sensing. In this paper, the sensor based on Sagnac ring is studied, which is formed by U-shaped bending modification of single-mode biased fiber. The characteristics of the sensor are analyzed experimentally, and the application of liquid level and temperature measurement is further studied. The sensor has the advantages of low cost, simple fabrication and convenient operation. The main contents of this paper are as follows: 1. Introduce the optical fiber sensor and related theoretical analysis. (1) introduce the research background and significance of the paper, the classification of optical fiber, the classification of optical fiber sensor, the advantages of interferometric optical fiber sensor, The main problems faced by optical fiber sensors and the research situation at home and abroad are introduced. (2) the theory of intermodal interference of single-mode bias fiber interferometric sensor is introduced. (3) the theory shows that Sagnac loop can improve the extinction ratio of interference. And through the experimental verification. 2, the sensor's many characteristics are analyzed experimentally. The structural characteristics of the sensor are as follows: (1) based on the experimental interference pattern of the Sagnac ring single-mode bias fiber sensor and the number of core fused contact points, the shape of the Sagnac ring is closely related to the shape of the Sagnac ring. (2) the number of troughs in the unit wavelength band is closely related to the length of the sensing arm. However, the amount of core deviation and the shape of the Sagnac ring have no obvious influence on it. Sensor sensing characteristics: (1) the temperature change makes the sensor interference spectrum line change. (2) the change of the sensor pressure will not have a great impact on the interference spectrum line. (3) after simulation, The loss of optical power in the cladding increases with the increase of refractive index. In addition, after a long immersion, the power of the interference line will continue to decrease, but with the passage of time, the central wavelength of each trough does not fluctuate significantly with the increase of time. 3, in order to further explore the sensor, The sensor is used to measure the liquid level and temperature. The experimental results show that there is a good sensing response relationship between the two environmental parameters and the central wavelength of the interference trough. By using the corresponding method, the gross error in the experiment is reduced, the selection of troughs is avoided, and the experimental efficiency is improved. After the experimental data were processed by the corresponding method, the liquid level sensitivity was 1.72 nm / cm and the temperature sensitivity was 0.689 nm/ 鈩，
本文编号：2387852
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