共查询到17条相似文献,搜索用时 203 毫秒
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轴向磁敏法评价消偏陀螺的性能 总被引:1,自引:0,他引:1
Lyot消偏器的性能直接决定着消偏光纤陀螺的零偏精度,评价消偏器的好坏在光纤陀螺工程化中至关重要.当前保偏焊接机精度下,精确获得Lyot消偏器的45°角需要进行多次焊接,且传统的评价方法是长期测试陀螺零偏稳定性,效率很底.本文提出通过增大垂直于光纤环面的轴向磁场,放大双消偏陀螺中的附加非互易相位差,从而短时间检测出陀螺的零偏.和传统的评价方法相比,本方法在检测Lyot消偏器45°误差方面效率提高了36倍,能评价的45°误差小于0.01°. 相似文献
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基于非局部连续介质理论,对处于轴向磁场作用下嵌入弹性基体中的输流单层碳纳米管(SWCNT),应用哈密顿原理,采用Euler-Bernoulli梁模型,建立了固支边界条件下该系统的横向振动微分方程.方程中计及磁场力与小尺度效应,弹性基体等效为Pasternak弹性模型.应用微分变换法(DTM)求解方程,着重研究了弹性基体、轴向磁场及小尺度效应耦合作用时该纳米输流管道系统振动稳定性问题.数值计算结果表明:弹性基体与轴向磁场均能提升系统的稳定性;而小尺度效应则降低系统稳定性.进一步的研究表明:随着弹性基体的增强,磁场对系统稳定性的影响受到一定程度的抑制;而对于小尺度效应而言,弹性基体的剪切参数抑制小尺度效应对系统稳定性的影响,但弹性参数放大了这一影响作用. 相似文献
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Yu. K. Chamorovsky N. I. Starostin M. V. Ryabko A. I. Sazonov S. K. Morshnev V. P. Gubin I. L. Vorob’ev 《Optical Memory & Neural Networks》2009,18(4):278-284
The simple design of a microstructured spun fiber with air channels has been developed. For the first time a magneto-optical
response of the microstructured spun fiber with high built-in linear birefringence has been experimentally studied. Most valued
magneto-optical properties of this fiber to be discovered are high sensitivity resistance at bent deformations and sensitivity
value is nearly to a theoretical value. It is showed that such microstructured fiber accumulates effectively Faraday phase
shift in magnetic field even when the fiber is coiled into a loop of a very small diameter. For example, a fiber coil of diameter
5 mm with 100 turns has a magneto-optical sensitivity of about 70% of “ideal” value and well agrees with model calculations.
Results are of a great significance for a fiber-optic current sensor. 相似文献
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光纤测磁传感仪根据Mach-Zehnder干涉仪原理制作,适用于测量静态弱磁场。传感仪的传感臂和参考臂由两条单模光纤组成,传感臂的光纤上粘合了一段磁滞伸缩材料作为传感头.当被测静态场与交变的偏置场共同作用于传感头时,磁滞伸缩材料所产生的纵向应变将导致光纤中的光相位发生变化,利用相位探测装置和锁相放大器就可得出被测场的大小。本系统可探测的最小静态场为79.57×10E-7(A/m)。 相似文献
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一种测量静态磁场的光纤传感仪 总被引:3,自引:2,他引:1
所述的传感仪根据Mach-zehnder干涉仪原理制作.传感臂和参考臂由两条单模光纤构成,传感臂的光纤上粘合了一段磁滞伸缩材料作为传感头,一个频率为ω0的偏置磁场施加于传感头上,当被测静态场与交变的偏置场共同作用于传感头时,磁滞伸缩材料所产生的纵向应变将导致光纤中的光相位发生变化,利用相位探测装置和锁相放大器就可测出未知场的大小,本系统可探测的最小静态场为10-6(Oe/m)。 相似文献
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N. I. Starostin V. P. Gubin Yu. K. Chamorovsky Y. V. Przhiyalkovskiy A. I. Sazonov A. I. Boev V. G. Kovalenko 《Optical Memory & Neural Networks》2011,20(2):90-97
Optical phase modulator on Faraday effect in microstructured spun fiber is suggested for current sensor. It is showed that
such modulator has a high effectiveness which is closed to theoretical one if a period of modulation is more than transit
time of light through the fiber. A variation of parameters of optical interferometer with incorporated modulator is experimentally
studied under mechanical disturbances on modulator fiber ends. It is discovered that a relative variation of interferometer
visibility factor is considerably more than a variation of magneto-optical sensitivity under identical disturbances. 相似文献