同时测量温度和折射率的光纤传感器
发布时间：2018-09-11 21:47
【摘要】：提出了一种基于马赫-曾德干涉仪(MZI)的温度与折射率同步测量的光纤传感器。本文传感器结构由两个球形结构级联一个锥结构组成,球形结构激发高阶包层模,锥结构扩大了倏逝场穿透深度范围。其原理是当纤芯中传输的光通过第1个球形结构时,一部分光进入包层中传输形成包层模,另一部分光继续在纤芯中传输形成纤芯模,由于纤芯与包层具有不同的折射率,因而纤芯模和包层模之间产生光程差,当两部分光到达另一端的球形结构时,在包层中传输的光耦合进入纤芯,从而与纤芯中传输的光在另一球出射处发生干涉,当外界环境(如温度、折射率等)发生改变,影响光程差,则干涉谱也将随之改变。实验结果表明,本文传感器结构的透射谱中,干涉峰对温度和折射率具有不同的响应灵敏度,因此可以利用矩阵法实现对温度和折射率的同步测量。在10~100℃和1.343 2~1.402 6RIU(refractive index unity)的测量范围内,强度解调可以达到约0.22℃和1×10~(-4) RIU温度和折射率分辨率。同时发现,波长解调可以达到0.37℃温度分辨率。本文传感器结构简单紧凑、成本低,可适用于多领域实现温度和折射率的双参量同步测量。
[Abstract]:An optical fiber sensor based on (MZI) for simultaneous measurement of temperature and refractive index is proposed. In this paper, the sensor structure is composed of two spherical structures cascade and a cone structure. The spherical structure excites the high-order cladding mode, and the cone structure expands the penetrating depth range of evanescent field. The principle is that when the light in the core passes through the first spherical structure, some of the light flows into the cladding to form the cladding mode, and the other part of the light continues to propagate in the core to form the core mode, because the core and the cladding have different refractive index. Thus, the optical path difference between the core mode and the cladding mode is produced. When the two parts of the light reach the spherical structure at the other end, the light transmitted in the cladding coupling into the core, thus interfering with the light transmitted in the core at the point of the other sphere. When the external environment (such as temperature, refractive index, etc.) changes and affects the optical path difference, the interference spectrum will also change. The experimental results show that the interference peak has different sensitivity to temperature and refractive index in the transmission spectrum of the sensor structure, so the simultaneous measurement of temperature and refractive index can be realized by matrix method. The intensity demodulation can reach about 0.22 鈩，
本文编号：2237949
[Abstract]:An optical fiber sensor based on (MZI) for simultaneous measurement of temperature and refractive index is proposed. In this paper, the sensor structure is composed of two spherical structures cascade and a cone structure. The spherical structure excites the high-order cladding mode, and the cone structure expands the penetrating depth range of evanescent field. The principle is that when the light in the core passes through the first spherical structure, some of the light flows into the cladding to form the cladding mode, and the other part of the light continues to propagate in the core to form the core mode, because the core and the cladding have different refractive index. Thus, the optical path difference between the core mode and the cladding mode is produced. When the two parts of the light reach the spherical structure at the other end, the light transmitted in the cladding coupling into the core, thus interfering with the light transmitted in the core at the point of the other sphere. When the external environment (such as temperature, refractive index, etc.) changes and affects the optical path difference, the interference spectrum will also change. The experimental results show that the interference peak has different sensitivity to temperature and refractive index in the transmission spectrum of the sensor structure, so the simultaneous measurement of temperature and refractive index can be realized by matrix method. The intensity demodulation can reach about 0.22 鈩，
本文编号：2237949
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