共查询到19条相似文献,搜索用时 109 毫秒
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首先介绍了零磁通HALL电流传感器的工作原理,根据光伏逆变器电量测量拓扑结构及传感器磁路特点,并在两个假设的基础上推出了传感器磁场有限元求解方程组。分析了FLUX软件的建模功能,网格编织特点,磁场仿真求解器原理和整个仿真求解流程。最后以LEM一款用于光伏100kW逆变器的HALL电流传感器为例进行全面的磁场仿真分析处理。这种磁场的仿真过程研究方法利于提高传感器设计效率和质量,对提高光伏系统的效率有较大意义。 相似文献
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偏振无关光纤迈克耳孙干涉型磁场传感器研究 总被引:1,自引:0,他引:1
采用琼斯矩阵法分析了法拉第旋转镜消除偏振诱导信号衰落的原理,阐述了基于磁致伸缩的光纤迈克耳孙干涉型磁场传感器基本原理。利用闭环控制工作点的方法,稳定了磁场传感器系统的工作点,然后对该系统进行了检测。结果表明,磁场传感器系统具有良好的稳定性,当外界磁场较小时,输出与外界磁场大小呈线性关系,在幅度为4000nT的交流磁场调制下,相位灵敏度可达1.4×10-3rad/nT,最小可测磁场达0.57nT。 相似文献
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针对光纤磁流体磁场传感器易受环境干扰及磁流体薄膜制作工艺复杂的问题,激光自混合干涉具有抗干扰能力强、稳定性好的特点,提出一种基于空间光的水平偏振激光自混合干涉的磁场测量方法,在外部磁场的作用下,水平偏振自混合干涉信号幅值发生变化,在一定范围内,磁场与信号幅值变化成正比,通过用施加磁场前后信号幅值的均值比与磁场的变化关系实现对磁场的传感检测。经过实验验证,信号的幅值在1%浓度的磁流体中衰减明显,薄膜厚度为0.5 mm,减小了薄膜的制作难度。在实验结果中对5.02 mt到19.112 mt磁场强度范围内的均值比进行线性拟合,相对误差最小为0.17%。 相似文献
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美国ADI公司最新推出的AD22151线性输出磁场传感器的主要特点是将大量霍尔元件阵列集成技术与内部温度补偿及信号调节电路结合起来实现单片集成,广泛用于汽车和工业监控系统中运动及特殊位置的检测。 相似文献
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近年来,压电薄膜振动传感器发展十分迅速,已被广泛应用于结构健康监测、医疗电子、加速度、器件振动等测量。该文针对压电薄膜振动传感器的性能检测,设计了一套以可调频激振台作为核心的压电传感器灵敏度与频响特性标定装置。振动信号由可调频激振台提供,标准压电传感器与自制传感器同步进行振动测试。测试结果表明,该装置可方便地实现对被测传感器灵敏度和频率响应特性的标定。标定系统整体设计简单,操作方便。同时系统体积小,稳定性高,测量误差小,便于对各种类型的压电振动传感器进行检测,具有很强的实用性和广阔的发展空间。基于该系统对自制压电薄膜传感器性能的标定,研究了压电薄膜传感器灵敏度的影响因素。 相似文献
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Wei Zhou Peng Xiao Yun Liang Qiling Wang Depeng Liu Qing Yang Jianhua Chen Yujing Nie Shiao-Wei Kuo Tao Chen 《Advanced functional materials》2021,31(42):2105323
Recently airflow sensors based on mechanical deformation mechanisms have drawn extensive attention due to their favorable flexibility and sensitivity. However, the fabrication of highly sensitive and self-adaptive airflow sensors in a simple, controllable, and scalable method still remains a challenge. Herein, inspired by the wing membrane of a bat, a highly sensitive and adaptive graphene/single-walled nanotubes-Ecoflex membrane (GSEM) based airflow sensor mediated by the reversible microspring effect is developed. The fabricated GSEM is endowed with an ultralow airflow velocity detection limit (0.0176 m s−1), a fast response time (≈1.04 s), and recovery time (≈1.28 s). The GSEM-based airflow sensor can be employed to realize noncontact manipulation. It is applied to a smart window system to realize the intelligent, open, and close behaviors via a threshold control. In addition, an array of airflow sensors is effectively designed to differentiate the magnitude and spatial distribution of the applied airflow stimulus. The GSEM-based airflow sensor is further integrated into a wireless vehicle model system, which can sensitively capture the flow velocity information to realize a real-time direction of motion manipulation. The microspring effect-based airflow sensing system shows significant potentials in the fields of wearable electronics and noncontact intelligent manipulation. 相似文献
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Kawahito S. Maier C. Schneiher M. Zimmermann M. Baltes H. 《Solid-State Circuits, IEEE Journal of》1999,34(12):1843-1851
This paper presents a CMOS two-dimensional (2-D) vector magnetic sensor system integrating two planar microfluxgate sensors and the complete electronics for sensor excitation and signal readout. The system is based on an industrial 0.8-μm double-poly, double-metal CMOS technology with ferromagnetic NiFeMo cores added in a simple postprocessing sequence. The fluxgate sensors are embedded in a ΣΔ analog-to-digital converter for a stable and precise digital detection of weak magnetic fields. A cascaded ΣΔ modulator topology is utilized to obtain second-order noise shaping and to suppress pattern noise. Within the range of ±50 μT, the system nonlinearity is less than 1.5 μT. The angular resolution as a 2D vector sensor is less than 4° for a measured magnetic induction of 50 μT. This makes the 2-D microfluxgate magnetometer suitable for use as fully integrated electronic compass 相似文献
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目前深空遥感探测多采用CCD作为高分辨率相机的传感器,相较于CCD,面阵CMOS驱动更简单、功耗更低、抗辐射能力更强,是深空遥感探测目前的发展趋势。为此,本文基于CMOSIS公司生产的型号为CMV20000,图像分辨率为5 120×3 840的CMOS探测器,设计完成了一个大面阵CMOS高分辨率相机,图像分辨率为5 120×3 840。详细阐述了以FPGA为核心的电子学系统的整体结构,结合CMV20000的工作模式和时序电路,实现了高分辨图像的高速传输以及数据校正。试验结果表明,设计的相机系统方案合理,解决了CMV20000数据无法对齐的数据校正问题,系统运行稳定可靠,安装光学系统后能够获取高质量图像。 相似文献
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CCD传感器实时检测系统是一套基于光电检测技术的质量监测仪器,可用于实时观测和测量被加工工件,特别适合安装应用于微细电火花加工机床。此系统利用CCD(Charge-CoupleDevice)传感器对工件进行非接触式测量,提高了微细电火花加工机床的工作效率和质量。此文对这一系统进行讨论,分析了其特点和优越性。 相似文献