共查询到19条相似文献,搜索用时 125 毫秒
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顺变柱体型全光纤加速度检波器敏感元件 总被引:2,自引:0,他引:2
本文阐述了顺变柱体型全光纤加速度检测波器敏感元件的工作原理及结构设计。该敏感元件包括两个顺变柱体和一个质量块,两顺变柱体上都紧紧地缠绕着单模光纤,形成了迈克尔逊干涉仪的两个臂。经理论计算证明,其灵敏度和频率响应可通过适当选择顺变柱体的材料和尺寸、质量块的质量及光纤包层直径来设计确定。 相似文献
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不论机械引信、全电子引信还是机电一体化引信,都利用传感器对环境、目标进行探测,获取信息,并加以识别和处理,用于对战斗部安全保障和炸点控制。通常,钻地弹自适应引信利用加速度传感器测量弹体侵彻过程的加速度信号,一方面运用数字信号处理技术提取加速度信号的特征信息,如加速度幅度、拐点、上升沿、突变次数等,由此对目标层数有效判别,实现定层引爆;另一方面,在已知侵彻初速度和侵彻角度时,对加速度信号积分便得到实时侵彻速度,再次积分可得侵彻深度,从而实现定深引爆。 相似文献
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介绍了一种用于石油勘探的井下3维VSP(Vertical Seismic Profile)采集系统设计方案,实验验证该系统达到了可测量动态范围80 dB(可测量最大值与最小之比),系统采集、处理和传输的总延时低于200 ms(2 kbit/s采样率)的指标,适用于井下VSP采集.系统采用六级光纤加速度传感器组成阵列,其中每级传感器由三个麦克尔逊干涉仪构成.使用高速DSP处理芯片实现相位产生载波(Phase Generated Carrier,PGC)解调等算法以获得地震波信号;同时应用多个ARM处理器设计光纤检波器阵列控制器以及阵列内部总线. 相似文献
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介绍采用光学CT及CCD技术的大坝位移自动检测系统中结合采用数字信号的信息提取方法,对该方法在各种具有情况下处理信号的结果进行分析。 相似文献
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引言 一定形状和大小的压电元件,有它特定的若干个不同的振动模,这些模往往不独立,而是彼此发生耦合的,这使振动特性变得相当复杂。为了探索耦合振动的机理,我们研究了压电陶质钛酸钡矩形薄板轮廓模耦合振动的特性。对于这个问题,Hayashi和田中哲郎等人曾作过研究,但他们的理论只能分析耦合共振频率,而不能分析耦合反共振频率和耦合导纳的频率响应特性。为此,在他们的工作基础上我们提出了一个新的等效电路,它不但可以分析耦合共振频率,而且可以分析耦合反共振频率和耦合导纳的频率响应特性。 相似文献
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A compact in-fiber integrated fiber-optic Michelson interferometer based accelerometer is proposed and investigated. In the system, the sensing element consists of a twin-core fiber acting as a bending simple supported beam. By demodulating the optical phase shift, we obtain that the acceleration is proportional to the force applied on the central position of the twin-core fiber. A simple model has been established to calculate the sensitivity and resonant frequency. The experimental results show that such an accelerometer has a sensitivity of 0.09 rad/g at the resonant frequency of 680 Hz. 相似文献
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在HIRFL加速器系统中, 需要对射频加速电压的幅度和相位进行精确控制,以实现对重离子的精确俘获、 加速和引出。传统的幅度、相位稳定控制系统采用幅度和相位两个反馈闭合环路来分别稳定腔体电压的幅度和相位。 数字化高频低电平控制系统(LLRF) 基于可编程逻辑门阵列(FPGA)和数字信号处理(DSP), 采用直接数字频率合成(DDS)与数字正交调制解调(I/Q)技术来实现对高频功率源的控制。 相位控制精度更高, 系统更加稳定。 目前控制系统在假负载上通过了长期稳定性的实验和高功率实验, 幅度偏差小于或等于±1%, 相位偏差小于或等于±0.5°。 In order to ensure that the beam quality is well enough, we need to precisely control the frequency, amplitude and phase of cavity electric field. Traditional control system consists of amplitude loop and phase loop. And these two loops control amplitude and phase stability respectively. The digital low level radio frequency (LLRF) system, which uses advanced digital control technology, needs only one feed back loop to control amplitude and phase stability. The phase control precision and stability of the system are higher than the traditional control system. The LLRF system is based on field programmable gate array (FPGA) and digital signal processing (DSP), and implemented by direct digital frequency synthesis (DDS) and digital orthogonal modulation and demodulation (I/Q) technology. The digital LLRF system has been tested in a long term stability and high power experiments. The amplitude deviation is lower than ±1%, and phase control accuracy is within ±1°. 相似文献
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强流质子RFQ加速器加速场的频率为352.2 MHz,加速场幅度和相位的精度分别要求控制在±1%和±1°的范围,为了达到这一要求,设计了一套数字低电平控制系统,该系统包括加速场的幅度和相位控制、腔体的谐振频率控制和高功率射频连锁保护3个部分。腔体采样信号的下变频及反馈激励信号的上变频由模拟器件来完成。幅相实时反馈处理过程采用数字I/Q解调的方法,在1块stratixⅡ的FPGA板上实现,板上另有3块DSP用于通信和协助FPGA进行数据处理。系统完成后与RFQ加速器进行联机调试,测试结果基本满足控制精度的要求。 相似文献
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Xiang Zhou 《中国光学快报(英文版)》2010,(9):863-870
This paper presents a review on the recent progress of digital signal processing (DSP) in the high-speed optical transmission system using single-carrier based multi-level modulation formats. The principle of several digital phase and polarization tracking algorithms recently proposed and demonstrated for future spectrally-efficient optical transmission system are discussed in detail. A novel DSP-based interference mitigation algorithm for the single-ended coherent receiver has been included. Recent technology advance on transmitter-side DSP such as digital pulse-shaping, pre-equalization and digital nonlinear compensation has also been discussed. 相似文献
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Compact fiber optic accelerometer 总被引:1,自引:0,他引:1
A compact fiber optic accelerometer based on a Michelson interferometer is proposed and demonstrated. In the proposed system, the sensing element consists of two single-mode fibers glued together by epoxy, which then act as a simple supported beam. By demodulating the optical phase shift, the acceleration is determined as proportional to the force applied on the central position of the two single-mode fibers. This simple model is able to calculate the sensitivity and the resonant frequency of the compact accelerometer. The experimental results show that the sensitivity and the resonant frequency of the accelerometer are 0.42 rad/g and 600 Hz, respectively. 相似文献
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Masashi Kato 《Applied Acoustics》2011,(10):732-736
Conventional active noise control (ANC) in ducts has been realized with digital signal processing. The physical size of the conventional ANC systems is usually large owing to the signal processing interval, and the cost of the system depends on the price of the digital signal processor (DSP). This paper proposes a new ANC system with an analog neural network circuit, which will process signals in short time periods without DSP. The proposed neural network circuit has a simple structure consisting of analog multipliers and an integrator, and we simulated the performance of the circuit by HSPICE. We also fabricated a circuit connected to a real duct and confirmed operation of the proposed ANC system. 相似文献
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介绍了基于TI公司多核定点DSP(TMS320C6474)的高速实时数字信号处理系统。系统利用FPGA作为控制单元和转接芯片,通过SRIO接口作为DSP芯片的数据输入输出接口,具有信号处理能力超高、输入输出接口简洁、以及存储能力较大的优点。在软件实现中,利用了乒乓数据吞吐,静态内存分配技术和三核软件同步机制,通过优化算法,高效地实现了三核DSP实时信号处理,计算效率达到了设计要求。在项目图像信号实时处理中得到了成功应用,取得了良好的效果。 相似文献