共查询到19条相似文献,搜索用时 6 毫秒
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理论上推导了光纤法布里-珀罗复合结构传感器的反射光谱条纹对比度与外界介质折射率的关系,并分析了实验参数对传感器灵敏度的影响.利用化学腐蚀渐变折射率多模光纤制作了光纤法布里-珀罗复合结构折射率传感器,空气中的条纹对比度可达30 dB以上,折射率测量的灵敏度达45 dB/RIU(refraction index unit,简RIU)以上.实验结果与理论符合很好.通过理论和实验分析,提出了进一步提高传感器灵敏度的方法.
关键词:
光纤传感器
法布里-珀罗复合结构
折射率测量
灵敏度 相似文献
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讨论了用恒偏向角法测量直角三棱镜折射率的原理,得到了恒偏向角条件下的折射率计算公式.设计了简单实用的实验方法,实验结果与理论分析符合较好. 相似文献
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折射率与电声子相互作用的关系 总被引:1,自引:1,他引:0
从微观出发研究电声子相互作用对折射率的影响。用半经典方法导出一个适用于晶态和无序度小的介质折射率公式和折射率温度系数公式。首次指出电声子相互作用引起的折射率温度系数,高温时为一常数,低温时与T~3成正比。并与实验作了对比,理论曲线与实验符合得很好。用得到的公式计算了好几种材料的温度系数。计算值与实验值相符合。 相似文献
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微波异常传播中的负折射率问题 总被引:10,自引:0,他引:10
给出关于电磁波折射率理论的评述,重点介绍了美国圣迭戈加州大学(UCSD)研究组关于负折射率的实验,该实验证明左手化物质(LHM)确实呈现负折射率。 相似文献
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Design of an optoelectronic refractometer having an adjustable range of refractive index measurement
R.K. Shukla Atul Srivastava Anchal Srivastava Manoj Srivastava Shobhna Dixit D. Misra 《Optics & Laser Technology》2008,40(5):692-696
A real-time optoelectronic refractometer having an adjustable range of refractive index measurement is presented. The adjustment is achieved by obtaining a shift in the zero-reflected intensity point at the interface following the introduction of a glass plate of refractive index different from that of the constituent prism. The sensitivity remains reasonably high over the enhanced range of refractive index measurement. The experimental results are in qualitative agreement with the theoretical calculations. This refractometer sensor, which is based on the detection of modulation in emergent light intensity, has a sturdy and user-friendly design. 相似文献
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A novel all-fiber refractometer sensor is proposed, which is based on multimode interference in the multimode fiber core section sandwiched between two single-mode fibers. A wide-angle beam propagation method in the cylindrical coordinate is employed as the modeling tool for simulation and design of the proposed refractometer sensor. The design for a refractometer is presented that shows that the refractometer would have an estimated resolution of 5.4 x 10(-5) for refractive indices from 1.33 to 1.45 and of 3.3 x 10(-5) for refractive indices from 1.38 to 1.45 through the choice of an appropriate length of the multimode fiber core section. 相似文献
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A method is described for obtaining an accurate real-time measurement of the refractive index of liquids. It is based on a modification of the Pulfrich refractometer. The optical arrangement is suitable for in-line industrial applications where a continuous measurement is required. Some experimental results are presented which confirm the feasibility of the method. 相似文献
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基于光束扫描法的光纤预制棒折射率测试仪主要适用于直径和长度在一定范围内的圆柱形样品折射率分布的测试。提出一种套管辅助法可实现更短长度、更细直径和变直径样品的折射率测试。该方法将待测样品居中放置于一个尺寸符合测试要求的圆柱形套管内,并在套管内注入折射率匹配油,使其没过待测样品后按常规步骤进行测试。对比实验结果表明,套管辅助法与直接测量法的偏差与仪器的测量误差相当。采用套管法,获得了预制棒拉丝终止后变径区不同位置折射率的径向分布,可为拉丝过程的研究提供参考。 相似文献
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J. Pluciński 《The European physical journal. Special topics》2008,154(1):159-163
A high resolution optical refractometer for dispersion
measurement in the UV-NIR range is described. Using this refractometer,
refractive index of a range of liquid samples, such as aqueous solutions of
sugars, salts and alcohols, was measured as a function of wavelength in the
range from 300 nm to 920 nm with accuracy better than 10 - 5. So
accurate results can be used for improvement of resolution of OCT
measurements conducted in biological samples. 相似文献
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本文对作者提出的圆盘式折射率计里的光线,特别是非平行光线的传输问题进行了详尽的分析.分析及计算机计算表明,圆盘式折射率计的线性度甚至可对非平行光线仍良好保持.圆盘内光线的多次反射克服了非全内反射的影响,使得输出线性度仍然得以保持.有关参数设计及改进精度的讨论亦在本文作了讨论. 相似文献
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Pabitra Nath 《Pramana》2010,74(4):661-668
An experimental realization of a simple non-intrusive refractometer sensor is demonstrated in this communication. The working
principle of the sensor is based on intensity modulation of the back-reflected light when output light from an optical fibre
end focusses onto air-medium interface. The change in the refractive index of the medium affects the reflectance of the incident
light signal and thus modulates the back-reflected signal. Refractive index variation as small as 0.002 RIU can be measured
using the present technique. The advantages of the technique are its simplicity, cost efficiency and usefulness in monitoring
refractive indices of acidic solutions. 相似文献
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圆盘型液体线性光电折射率计 总被引:2,自引:0,他引:2
提出一种具有线性响应的圆盘型液体光电折射率计,光线在圆盘内的多次反射显著地消除了非全内反射的影响,有效地改善了测量线性度,这种圆盘型光电折射率计甚至可对非平行入射光束仍保持相当好的线性度。 相似文献