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《光学学报》2010,(6)
提出了一种基于菲佐干涉仪的并联复用光纤法-珀加速度传感器的解调原理及系统,其中光纤法-珀加速度传感器是基于惯性质量引起法-珀腔腔长变化实现加速度传感的原理。针对此并联复用系统,建立了菲佐干涉仪的相对输出光强与光纤法-珀加速度传感器的法-珀腔腔长和菲佐干涉仪的厚度之间的关系模型,进一步建立了基于菲佐干涉仪的光纤法-珀加速度传感器系统的加速度传感理论模型。在此基础上对菲佐干涉仪解调并联复用光纤法-珀加速度传感器信号的原理进行了数值仿真,并对基于菲佐干涉仪解调的多通道光纤法-珀加速度传感器并联复用能力进行了分析。研究结果表明,数值仿真结果和理论分析相吻合,菲佐干涉仪解调多通道光纤法-珀加速度传感器并联复用系统具有可行性。 相似文献
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提出了一种基于光纤光栅法布里-珀罗干涉仪且可以同时测量交变电流和温度的传感器,并对其进行了理论分析和实验研究.该传感器采用单频激光入射,作为反射镜的一对光纤布喇格光栅自由放置,其间的法布里-珀罗腔粘贴在磁致伸缩材料上,通电导线周围的磁场通过磁致伸缩材料作用于光纤光栅法布里-珀罗腔,引起腔长周期性变化.同时,由于热膨胀和热光效应,环境温度的变化会引起光纤长度和折射率的改变,从而改变光纤光栅法布里-珀罗腔的反射光谱特性.通过检测输出光信号的频率和峰值可实现电流和温度的同时测量.对通电线圈的电流及环境温度进行测量的实验结果与理论分析相吻合. 相似文献
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提出了一种基于光纤光栅法布里-珀罗干涉仪且可以同时测量交变电流和温度的传感器,并对其进行了理论分析和实验研究.该传感器采用单频激光入射,作为反射镜的一对光纤布喇格光栅自由放置,其间的法布里-珀罗腔粘贴在磁致伸缩材料上,通电导线周围的磁场通过磁致伸缩材料作用于光纤光栅法布里-珀罗腔,引起腔长周期性变化.同时,由于热膨胀和热光效应,环境温度的变化会引起光纤长度和折射率的改变,从而改变光纤光栅法布里-珀罗腔的反射光谱特性.通过检测输出光信号的频率和峰值可实现电流和温度的同时测量.对通电线圈的电流及环境温度进行测量的实验结果与理论分析相吻合. 相似文献
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双法布里—珀罗干涉仪传感模型的理论分析 总被引:1,自引:1,他引:0
本文提出了一种用发光二极管作为光源、用自聚焦透镜构成法布里-珀罗腔的双法布里-珀罗干涉仪光纤位移传感模型.根据部分相干光的干涉理论,得到了这个传感模型输出光强与两个法布里一珀罗干涉仪腔长之差的函数曲线. 相似文献
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高精细度微透镜光纤法布里-珀罗干涉仪 总被引:1,自引:0,他引:1
通过在镀膜单模光纤端面制作微透镜,构造了微透镜光纤法布里-珀罗干涉仪.利用ABCD矩阵方法分析厂微透镜法布单-珀罗腔的模场.由于微透镜的会聚作用,法布里-珀罗腔模场可以和单模光纤模场良好的匹配,从而达到高精细度和低插入损耗.实验制作的微透镜光纤法布里-珀罗干涉仪,自由光谱区范围32.28 nm,精细度为78,峰值透射比为73%;在法布里-珀罗腔的光学腔长增加到100um的情况下,峰值透射比仍然大于50%.该微透镜光纤法布里-珀罗十涉仪制作容易、对设备要求低,可以封装成光纤法布里-珀罗滤波器和传感器,具有广泛的应用前景. 相似文献
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用法布里-珀罗标准具或迈克尔孙干涉仪改装的法布里-珀罗干涉仪测量钠黄光超精细结构光谱,其列距与文献记载相符. 相似文献
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The displacement of the peak of a wavepacket that crosses an empty Fabry-Perot cavity is measured by using photon pairs generated by parametric down conversion, a Hong-Ou-Mandel (HOM) interferometer and coincidence detection. The Fabry-Perot cavity distorts the photon wavepacket. The HOM interferometer is a good tool to map this distortion. We discuss the corrections which must be made in the two-photon inteference results, in order to achieve the true data researched. Even in the absence of active absorbers media or media with inverted atomic populations, superluminal-like effects connected with the tunnelling phenomena are observed. An interpretation of the experimental results in the causality frame is given. 相似文献
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The frequency shift of laser source of Doppler lidar is required in the range of a few megahertzs. To satisfy this demand,
a confocal Fabry-Perot (F-P) interferometer was manufactured as the frequency standard for frequency stabilization. After
analyzing and contrasting the center frequency shift of confocal Fabry-Perot interferometers that are made of three different
types of material with the change of temperature, the zerodur material was selected to fabricate the interferometer, and the
cavity mirrors were optically contacted onto the end of spacer. The confocal Fabry-Perot interferometer was situated within
a double-walled chamber, and the change of temperature in the chamber was less than 0.01 K. The experimental results indicate
that the free spectral range is 500 MHz, the full-width at half maximum is 3.33 MHz, and the finesse is 150. 相似文献
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A novel scheme is proposed to transform a Gaussian optical pulse to a millimeter-wave (mm-wave) frequency modulation pulse by using a Fabry-Perot interferometer (FPI) for radio-over-fiber (ROF) system.It is shown that modulation frequency of mm-wave is determined by the optical path of the Fabry-Perot (F-P) cavity, and amplitude decay time and energy transfer efficiency are related to the reflectivity of the F-P cavity mirror. The effect of pulse train extension on inter-symbol interference is also discussed. 相似文献
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测量光纤外腔Fabry-Perot干涉仪的白光干涉术 总被引:5,自引:4,他引:1
提出了一种基于白光干涉术测量低锐度光纤外腔Fabry Perot干涉仪(EFPI)的方法用宽带光源注入F P腔,在接收端用一高锐度的可调谐光纤F P滤波器对EFPI的反射光谱进行扫描,获得了周期性变化的光谱输出为了测量出EFPI的腔长,对光谱信号进行傅里叶变换,得到光谱的周期,由此求出EFPI的绝对腔长证明了用低锐度EFPI的测量准确度由腔长决定F P腔越长,测量准确度越高在腔长分别是200 μm,400 μm和600 μm时,测量的腔长与实际腔长相同. 相似文献
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从数值上分析了光源相干长度对光纤Fabry-Perot干涉的影响。推导了光源在理想情况和非理想情况下的光纤Fabry—Perot干涉模型,通过计算机模拟了干涉信号,指出在非单色光源下,干涉条纹失去周期性,随着腔长相干长度比增加干涉条纹的变化幅度减小,最后演化成一条直线,条纹的可见度也慢慢趋近于零。综合考虑了光纤的耦合效率和光源的非单色性对干涉信号的影响,随着腔长的增加,干涉信号的幅值和变化幅度都在减小,信噪比变差。要得到好的干涉信号,腔长不宜选择过大,必须使光源的腔长相干长度比值低于0.1。 相似文献
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计算电容是复现电学阻抗单位的基准装置, 利用计算电容值和量子霍尔电阻值可以准确计算出精细结构常数α. 计算电容的本质是通过高准确度地测量屏蔽电极的位移, 实现对电容量值的测量. 因此, 基于Fabry-Perot干涉仪的精密电极位移测量系统是计算电容装置中最为核心和关键的部分. 在Fabry-Perot干涉仪测位移过程中, 由于高斯激光束存在轴向Gouy相位, 该附加相位将会引起相邻干涉条纹对应位移的变化(大于或者小于λ/2), 导致位移的测量值与实际值存在偏差. 本文阐述了高斯激光场的传播特性, 利用高斯激光束在自由空间和透过薄透镜复振幅的变换关系, 建立了计算电容装置中Fabry-Perot干涉仪透射光束的传输模型; 通过对不同腔长的Fabry-Perot干涉仪透射光场相位的分析, 获得了高斯激光束轴向Gouy相位修正与传输距离的关系. 结果表明, 当腔长从111.3 mm移动至316.3 mm时, 在接收距离为560 mm的情况下, 高斯光束轴向Gouy 相位引起的位移修正的绝对值最小为0.7 nm, 其相对相位修正量|δL|/|ΔL| = 3.4×10-9. 相似文献
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Frequency modulation is achieved in the optical range by changing the length of Fabry-Perot interferometer. Either the geometric dimensions of the interferometer or its optical path length can be changed. The optical path length of the interferometer can be controlled by changing the refractive index of an electrooptical crystal in the cavity.Translated from Izvestiya VUZ. Fizika, No. 5, pp. 35–39, May, 1971. 相似文献
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Parallel demodulation system and signal-processing method for extrinsic Fabry-Perot interferometer and fiber Bragg grating sensors 总被引:1,自引:0,他引:1
A parallel demodulation system for extrinsic Fabry-Perot interferometer (EFPI) and fiber Bragg grating (FBG) sensors is presented that is based on a Michelson interferometer and combines the methods of low-coherence interference and Fourier transform spectrum. Signals from EFPI and FBG sensors are obtained simultaneously by scanning one arm of a Michelson interferometer, and an algorithm model is established to process the signals and retrieve both the wavelength of the FBG and the cavity length of the EFPI at the same time, which are then used to determine the strain and temperature. 相似文献
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S. E. Strigin 《Optics and Spectroscopy》2012,112(3):373-376
The nonlinear effect of a parametric oscillatory instability in a Fabry-Perot cavity of the Einstein Telescope is investigated.
Unstable combinations of elastic and optical modes are calculated for two possible configurations of the third-generation
gravitational-wave detector. The results are compared with those for the LIGO gravitational-wave interferometer. 相似文献