共查询到18条相似文献,搜索用时 109 毫秒
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聚合物封装的高灵敏度光纤光栅温度传感器及其低温特性 总被引:10,自引:0,他引:10
介绍了一种新型的光纤光栅温度传感器。这种光纤光栅温度传感器使用了特殊的工艺将光纤布拉格光栅封装于一种热膨胀系数较大的有机聚合物基底中 ,使得传感器的温度灵敏性比裸光纤光栅提高了 12 .3倍 ,其温度灵敏度系数KT 达到 82 .6 9× 10 -6/℃。在 - 80~ 0℃的低温度范围内 ,对这种新型光纤光栅温度传感器的反射谱进行了测量。研究了这种新型光纤光栅温度传感器的低温特性 ,并与裸光纤光栅和铝基封装的光纤光栅进行了比较 ,结果表明这种新型的光纤光栅温度传感器具有很好的低温响应特性。 相似文献
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研究了小直径光纤光栅的研制以及传感中的温度应变交叉敏感问题.首先根据耦合模理论,分析了小直径光纤Bragg光栅光谱特性,确定了包覆层为80 μm的单模光纤加工成中心波长为1 528 nm的Bragg光栅的栅长及周期,并研究了小直径光纤光栅与解设备之间的连接方式.其次利用等强度梁的变形特点,结合矩阵法,提出基于等强度悬臂梁双Bragg光纤光栅矩阵算法,对小直径光纤Bragg光栅的交叉敏感问题进行研究.温度和应变的实验辨别误差分别为5%和6%.实验结果表明,该方法可以分离温度和应变对光纤Bragg光栅传感的影响.采用该方法去除交叉影响,K矩阵始终存在逆矩阵,因此对所采用的光栅无特殊要求,从而扩大了光纤光栅选用范围,并将温度和应变识别出来. 相似文献
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通过对柚子型微结构光纤Bragg光栅的多个反射峰的温度和应变传感特性进行的理论和实验 研究,得出柚子型微结构光纤Bragg光栅的反射波长与温度呈二次关系,且理论和实验二者 吻合较好; 同时发现每个反射峰的温度灵敏度不同.理论分析柚子型微结构光纤Bragg光栅的 反射波长与应变呈线性关系,实验得到了该种Bragg光栅的反射波长与应变的线性关系,实 验结果与理论分析相吻合.由于微结构光纤光栅反射谱中多个峰对温度和应变等物理量敏感 度不一致,这种Bragg光栅更适合应用到多参量传感领域.
关键词:
微结构光纤
光纤Bragg光栅
温度传感
应变传感 相似文献
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提出一种基于铝片的测量温度和流速的光纤布喇格光栅(FBG)传感器。采用一种耐高温胶将光纤布喇格光栅封装在一小铝片上,经过高温固化处理,可保持光纤光栅传感器的稳定性。通过-20℃~100℃温度实验,得到该传感器的温度灵敏度系数为0.0392nm/℃,是封装前的3.5倍,且传感器温度响应保持了很好的线性和重复性。从水温14.5℃时的流速实验中得到水流速在0~20m/s范围变化时,FBG峰值波长漂移了0.13nm,验证了此光纤光栅传感器测量流速的可行性。试验结果表明,该传感器既可以作为温度传感器,又可以作为流量传感器,并且制作简单,成本较低。 相似文献
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A high sensitive fiber Bragg grating (FBG) strain sensor with automatic temperature compensation is demonstrated. FBG is axially linked with a stick and their free ends are fixed to the measured object. When the measured strain changes, the stick does not change in length, but the FBG does. When the temperature changes, the stick changes in length to pull the FBG to realize temperature compensation. In experiments, 1.45 times strain sensitivity of bare FBG with temperature compensation of less than 0.1 nm Bragg wavelength drift over 100 ℃ shift is achieved. 相似文献
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We demonstrate the use of adaptive simulated annealing (ASA) algorithm for determining the strain profile along a fiber Bragg grating (FBG) from its amplitude reflection spectrum. By combining the ASA algorithm and the matrix method for calculating the reflection spectrum of a FBG, the FBG sensor can be used for the distributed strain sensing. Experiments showed that the strain detection accuracy could be in the order of a few microstrains. 相似文献
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To test whether the fiber Bragg grating (FBG) sensor can endure the steady-state inertial loads caused by the acceleration and the sensing properties during the loads, a FBG strain and temperature sensor with aluminium alloy substrate package was designed, and the acceleration performance on the sensor was tested. The sizes of FBG strain and temperature sensor were designed and its package process was described. The strain and temperature sensing mechanisms of FBG sensor were analyzed, and the spectrum detection and demodulation system based on volume phase grating and linear array photodetector was developed. Finally, the acceleration test equipment was established, and the acceleration performance test of the selected FBG strain and temperature sensor was carried out in accordance with the requirements and methods of GJB150.15A acceleration test. The experimental results show that in the 2 min performance test before and after the acceleration test, the wavelength offset is below to ±50 pm, and the change of light intensity is below to 0.3 V. In acceleration test, the maximum fluctuation of wavelength offset is ±7 pm, and the light intensity is in the range of 1.3 V~4.003 V. It is proved that the designed FBG sensor has the ability to endure the acceleration loads and has the good sensing performance during the acceleration loads. Copyright ©2022 Journal of Applied Optics. All rights reserved. 相似文献
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改善波形并增敏的光纤光栅温度传感技术 总被引:3,自引:1,他引:2
选用热膨胀系数较大的聚合物和某种偶联材料,采用特殊工艺用其对裸光纤光栅进行封装,消除了封装过程中所带来的光纤光栅啁啾现象,极大地改善了光纤光栅反射波的波形,提高了封装测试过程的重复性,为波长解调解决了一大难题.在30.6℃~120℃范围内,测量过程中波形很好并几乎不变,温度灵敏度为0.1173 nm/℃,温度分辨率为<0.43℃,比裸光纤光栅增加了11倍;平均灵敏度增敏倍数γ′=10.34,与理论计算灵敏度增敏倍数γ=10.76符合得比较好.聚合物封装光纤光栅的温度响应曲线具有很好的线性. 相似文献
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提出了一种基于光纤布拉格光栅嵌入单模-多模纤芯-单模(single-mode-multimode fiber core-single mode, SMS)光纤结构的湿度传感器。当环境湿度变化时,SMS光纤结构的干涉光谱会发生漂移,而光纤布拉格光栅对湿度不敏感,其纤芯基模保持不变。因此利用SMS光纤结构对环境湿度的敏感性去调制光纤布拉格光栅纤芯基模,通过检测光纤布拉格光栅纤芯基模的反射能量变化就可以实现湿度测量。数值模拟了SMS光纤结构的内部光场分布规律,理论计算了不同环境折射率时,多模纤芯的长度、直径对SMS光纤结构输出能量耦合系数的影响。理论模拟表明,随着环境折射率变化,SMS光纤结构中传输的纤芯基模的输出能量耦合系数会发生变化。同时制作了传感器样品并对其进行了传感实验研究,实验结果表明多模纤芯长35 mm、纤芯直径为85 μm的传感器在45%~95%RH湿度变化范围内,湿度灵敏度为0.06 dBm·(%RH)-1。在20~80 ℃温度范围内,传感器的温度灵敏度为0.008 nm·℃-1,温度所带来的湿度测量误差为0.047%RH·℃-1。传感器具有制作简单、灵敏度高、反射式能量检测等优点,在湿度测量领域有一定的应用价值。 相似文献
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平面圆形膜片式光纤布拉格光栅温度补偿压强传感 总被引:2,自引:0,他引:2
报道了利用光纤布拉格光栅反射波谱带宽展宽技术实现温度补偿的压强传感新方案。结合平面圆形膜片应变调谐的特点,采用膜盒式结构,将光纤光栅中心对准平面圆形膜片零应变半径并沿径向粘贴,利用反射波谱带宽对应变敏感而对温度不敏感的特性解调压强,成功地实现了温度补偿的压强传感测量。基于光谱分析仪0.05nm的光谱分辨力,实验测得带宽随压强响应灵敏度为0.34nm/MPa,压强精度为±0.15MPa,压强测量范围为0~7.5MPa。实验结果与理论分析基本一致。 相似文献