共查询到18条相似文献,搜索用时 62 毫秒
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再入式光纤陀螺(Re—FOG)使相互干涉的两路光循环进入光纤环,通过缩短光纤长度克服温度和应力引起的误差。本文研究了再入武光纤陀螺实用化的相关技术;提出了一种采用脉冲相位调制的信号检测方法;设计了专门的数据通讯模块。实验结果表明:所提出的信号检测方法可分离出所需循环次数的信号并解算出陀螺转速;所设计的通讯模块能保证实现陀螺与导航计算机之间的快速、稳定、准确的数据传送。再入式光纤陀螺可成为实用化的新型光纤陀螺。 相似文献
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为了提高谐振式光学陀螺(Resonant optic gyro,ROG)数字检测系统的信噪比,消除解调曲线中的高频噪声,降低FPGA资源占有率,提出并设计了一种惯性数字低通滤波器.该滤波器能够满足ROG数字检测系统在40 MHz的高采样率下,低通截止频率连续,阶数可调,FPGA内部消耗资源少的要求.理论分析了惯性滤波器的函数模型,给出了该滤波器的数字实现过程,仿真并测试了截止频率为194.38 Hz,0.189Hz下的幅频和相频曲线.实验表明:设计的数字滤波器幅频、相频特性优良,FPGA资源占用率仅为0.09%,阶数及截止频率调节简便,满足了数字锁相放大器内低通滤波器的设计要求. 相似文献
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光纤陀螺姿态系统信号处理方案 总被引:1,自引:0,他引:1
光纤陀螺输出信号中存在较大的高频噪声,这降低了光纤陀螺姿态系统的解算精度。为此对信号进行多重积分,求取一个计算周期内载体姿态变化的旋转矢量表达式,从而得到一种新的信号处理方法,并讨论了其工程实现方案。仿真表明,与传统四元数算法比较,该方法在解算系统姿态的同时,能够较好地平滑噪声的影响。 相似文献
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光纤陀螺闭环方案研究与实验 总被引:1,自引:0,他引:1
在全光纤开环去偏光纤陀螺方案基础上,提出信号处理方法提高开环系统的动态范围和光学闭环的方案,对两个方案进行了原理和实验研究。测试结果表明,两种方案各能满足一定条件下的实用要求。 相似文献
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报道了一种在Y一切铁扩散LiNbO3平板光波导上制作的调频光纤陀螺用集成光学频移器。它由一对球面波导短程透镜和两个声表面波声光调制器组成。频移宽度为10MHz,调制器的中。C频率为107MHz,驱动功率为200mW。 相似文献
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光纤陀螺是20世纪70年代发展起来的一种新型惯性仪器,由于具有精度高、抗干扰能力强、预热时间短等一系列优点,在各个领域得到了广泛的应用。而要保证光纤陀螺的测试精度,一套高精度的测试系统是必不可少的。论文针对模拟光纤陀螺进行测试系统设计,以往采用较多的测试方法为:首先对信号进行A/D转换,再利用计算机进行数字信号采集;但由于AD转换存在精度低及连续性差等缺点,大大限制了测试系统的精度。基于这一方面考虑,论文中设计了一种简易的高精度光纤陀螺多路测试系统,直接对输出的模拟信号进行采集,再利用采集到的电压信号进行解算,得到角速度值。在组建完整套测试系统后,对设计的测试系统进行了试验验证及精度标定,试验结果表明,该测试系统具有较高的精度,完全可以满足中低精度模拟光纤陀螺的测试要求。 相似文献
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Fiber optic sensors for micro-displacement measurement are applied to displacement measurement of superconductors. Output characteristics of a fiber optic sensor were measured at 77 K and 4.2 K. The results show that the linearity between output voltage ratio and displacement is good both at 77 K and at 4.2 K, and the sensitivity at 77 K is higher than that at 4.2 K. 相似文献
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Ramon Pericet-Camara Michal K. Dobrzynski Rapha?l Juston Stéphane Viollet Robert Leitel Hanspeter A. Mallot Dario Floreano 《Journal of the Royal Society Interface》2015,12(109)
We describe a 2 mg artificial elementary eye whose structure and functionality is inspired by compound eye ommatidia. Its optical sensitivity and electronic architecture are sufficient to generate the required signals for the measurement of local optic flow vectors in multiple directions. Multiple elementary eyes can be assembled to create a compound vision system of desired shape and curvature spanning large fields of view. The system configurability is validated with the fabrication of a flexible linear array of artificial elementary eyes capable of extracting optic flow over multiple visual directions. 相似文献
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Considering the spatial position and shape detection properties of the fiber Bragg grating (FBG) curve sensor used in the human body, the positioning accuracy of the FBG curve sensor plays a major role in the pre-diagnosis and treatment of diseases. We present a new type of shape-sensing catheter (diameter of 2.0 mm and length of 810 mm) that is integrated with an array of four optical fibers, where each contains five nodes, to track the shape. Firstly, the distribution of the four orthogonal fiber gratings is wound around a nitinol wire using novel packaging technology, and the spatial curve shape is rebuilt based on the positioning of discrete points in space. An experimental platform is built, and then a reconstruction algorithm for coordinate point fitting of the Frenet frame is used to perform the reconstruction experiment on millimeter paper. The results show that, compared with those in previous studies, in 2D test, the maximum relative error for the end position is reduced to 2.74%, and in 3D reconstruction experiment, the maximum shape error is 3.43%, which verifies both the applicability of the sensor and the feasibility of the proposed method. The results reported here will provide an academic foundation and the key technologies required for navigation and positioning of noninvasive and minimally invasive surgical robots, intelligent structural health detection, and search and rescue operations in debris.The full text can be downloaded at https://link.springer.com/content/pdf/10.1007%2Fs40436-019-00284-z.pdf 相似文献
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以最大化检测概率为优化准则,采用基于凸优化和随机化方法的具有相似性约束的相位编码算法(Phase Coding Algorithm with Similarity Constrain,PCA-SC)来设计发射波形,解决了主动声呐系统增大探测目标发射功率却不能提高检测概率的问题。同时,为有效降低PCA-SC算法所设计编码自相关函数的整体旁瓣级,提高其检测微弱目标的能力,在PCA-SC算法的基础上,结合新循环算法(Cyclic Algorithm-New,CAN)多相编码技术,提出了基于CAN的PCA-SC波形优化方法(Cyclic algorithm-new Phase Coding Algorithm with Similarity Constrain,CAN-PCA-SC)。仿真实验结果表明,PCA-SC和CAN-PCA-SC两种波形优化方法获得的发射信号均能够在满足系统所需时域分辨能力的要求下,实现检测概率的最大化,提高了目标检测性能,将时域分辨能力和检测性能有效地统一起来。相比PCA-SC波形设计方法,CAN-PCA-SC波形设计方法在保证获得的发射信号的检测概率优化效果一致的情况下,具有更低的积累旁瓣水平和更好的检测微弱目标的能力。 相似文献