共查询到20条相似文献,搜索用时 93 毫秒
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巨磁阻抗效应是指材料的交流阻抗在外加直流磁场的作用下发生显著变化的现象,利用该效应研制的巨磁阻抗磁传感器具有灵敏度高、体积小和功耗低等特点,具有巨大的应用前景.分析了巨磁阻抗磁传感器的研究现状,重点介绍了磁场传感器、电流传感器和生物传感器的工作原理和特性,并指出了其目前存在的问题和发展趋势. 相似文献
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针对心磁图仪诊断技术在临床上的普及需求和心磁图检查费用高昂的矛盾现状,提出了一种基于巨磁阻抗传感器的心磁信号采集和信号处理方法。该方法依据心磁信号和心电信号的相关性,通过以巨磁阻抗传感器为核心的数据采集电路,同步采集两种信号,并根据功率谱密度分析结果,自动调整带通滤波器的参数,使其能自适应跟踪心电信号的频率,滤除噪声信号,最后取得心磁信号。通过实验证明了该方案可在常温下准确测得心磁信号,且设备维护成本低,操作简单易行。 相似文献
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用单辊快淬法制备的Fe76Si7.6B9.5P5C1.9非晶合金薄带,在540℃空气中退火后具有宽线性的磁敏特性。利用纵向驱动的方法研制一种巨磁阻抗(GMI)传感器,该磁传感器重复性好,迟滞误差小,在-0.3~+0.3 kA·m-1范围具有比较好的线性度,灵敏度达到12.65mV/A·m-1。 相似文献
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Yan Liu Zhen Yang Tao Wang Xue-cheng Sun Chong Lei Yong Zhou 《Microsystem Technologies》2016,22(9):2341-2347
As a classic weak magnetic field sensor, the fluxgate sensors have great potential application in many fields. This paper presents four kinds of the micro planar double-axis fluxgate sensors based on the MEMS technologies, which have different core materials and core structures. The core materials include electroplated permalloy, Co-based amorphous ribbon and Fe-based amorphous ribbon, and the core structures include single-layer open magnetic loop structure and double-layer closed magnetic loop structure. The sensor with closed double-layer Fe-based ribbon core exhibits a best sensitivity of 238 V/T due to reducing the magnetic flux leakage. The results show that the magnetic core with closed magnetic loop, high permeability and high saturation induction density will help increase the sensitivity of the micro double-axis fluxgate sensor. 相似文献
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Facing the new integrated applications, coordination between three parameters of the micro fluxgate sensor, namely, sensitivity,
power consumption and operation range, is the key to make the applications come true. This paper reports a new low power micro
integrated fluxgate sensor with low cost solution. A spiral electroplating permalloy magnetic core is introduced to reduce
excitation current. Due to the design of little coils resistance and thick magnetic core, the fluxgate sensor exhibits a power
consumption of 7.35 mW, a sensitivity of 117 V/T and a linear range of −200 to 200 μT. Compared with the constant-width magnetic
core and the multi rectangular ring magnetic cores, experiment results show that the spiral magnetic core benefits both smaller
excitation current and higher sensitivity. The newly developed fluxgate sensor maintains high sensitivity and wide linear
range with low power consumption. 相似文献
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提出了一种基于永磁薄膜的新型MEMS磁传感器,磁传感器由MEMS扭摆、CoNiMnP永磁薄膜和差分检测电容等部分组成。分析了磁传感器的磁敏感原理和电容检测原理,提出了器件的结构参数并对器件进行了模态仿真。利用MEMS加工技术成功制作了MEMS磁传感器样品,并进行了测试。测试结果表明:得到的MEMS磁传感器的电容灵敏度可达到27.7 fF/mT,且具有良好的线性度。根据现有的微小电容检测技术,传感器的磁场分辨率可达到36 nT。 相似文献
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The influence of an improved magnetic core on the micro fluxgate sensor about sensitivity and power consumption is investigated and discussed in this paper. We have fabricated the micro solenoid fluxgate sensors based on the MEMS technologies, with the electroplating permalloy cores, which are easy to process and used in common; and the amorphous soft magnetic ribbon cores, which have better soft magnetic performances but be hard to be integrated, respectively. Four magnetic core structures are designed, including rectangular structure, unequal width rectangular structure, multi rectangular ring structure and spiral structure. Spiral structure can improve the performances of the fluxgate sensor significantly, both sensitivity and power consumption. The micro fluxgate sensors with the amorphous soft magnetic ribbon cores are promoted in all aspects than those with the electroplating permalloy cores, including ultra low power consumption of 2.4 mW with unequal width rectangular structure, and high sensitivity of 118 V/T with rectangular structure in wide linear range of 0–800 μT. 相似文献
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一种平面四轴向磁通门传感器的设计 总被引:1,自引:0,他引:1
设计了一种新型的四轴向磁通门传感器,可测量铁磁性目标经过时产生的磁异信号在四个轴向上的变化情况,通过各轴间的相关性即可判断出目标的运动方向。结构中将四个三端式磁通门探头单元相间45°摆放,使得传感器的任一侧都有四个磁场强度分量的输入,结合分时激励的方法,与传统磁通门传感器相比,其具有电路简单,灵敏度高、稳定性好、功耗小等优点。经实验表明,该传感器方向识别正确率可达85%以上,能够较好的应用于安防及侦测领域中对目标运动及其方向的监测。 相似文献
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A. A. Petrin 《Automatic Documentation and Mathematical Linguistics》2009,43(6):355-362
This paper addresses sensor information processing in micro and nanomanipulations. The following sensor types are examined:
deformation, piezoelectric, capacitive, optical, and magnetic sensors. Their technical and comparative characteristics, principles
of action and features of application are described. New tendencies in the measurements of sensor information in the micro-
and nanoworlds are outlined. 相似文献
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论述了应用单片机80C196KC实现微机磁盘自动称重和配料的技术。重点介绍了电阻应变式传感器的应用和装置的结构、工作原理、硬件和软件的设计思想。详细阐述了电阻应变式传感器的输出信号的处理和可控硅触发电路。 相似文献
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设计了基于三轴磁感传感器阵列的体内微型诊疗胶囊定位跟踪系统,分析了系统的主要误差来源,提出了对背景磁场干扰、传感器灵敏度差异、传感器位置偏差、三轴传感器模块的非理想正交等误差的补偿和修正方法,并进行了定位实验和轨迹跟踪实验以检验误差修正效果。实验结果表明:误差修正后系统的定位与定向精度得到显著提高,对于距离传感器阵列平面150 mm的φ8 mm×8 mm的圆柱形N35铷铁硼永磁体,平均定位与精度达到8mm以内,平均定向精度达到6°以内,并能够对沿模拟肠道运动的内置永磁体的电子胶囊进行轨迹跟踪。 相似文献
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A rapid manufacturing process for the micro solenoid fluxgate sensor integrating multilayer amorphous ribbon core has been established, which combines the micro assembling method and the MEMS technologies. We select Fe-based amorphous soft magnetic ribbons for core materials and have fabricated the micro fluxgate sensors by MEMS technologies, with single-layer core and double-layer core respectively. The micro fluxgate sensors with double-layer core show the advantageous to that with single-layer core and exhibit sensitivity of 1089.2 V/T at excitation current of 120 mA rms, wide linear range of ?900 to 900 μT and power consumption of 24.48 mW. The noise power density of the single core fluxgate sensor is 2.48nT/Hz1/2@1 Hz. 相似文献