Bently探头330103-00-04-10-02-00

Bently探头330103-00-04-10-02-00，武汉百士自动化设备有限公司供应产品，美国本特利Bently探头，原厂原装，现货库存，价格优惠；

电涡流传感器能静态和动态地非接触、高线性度、高分辨力地测量被测金属导体距探头表面的距离。它是一种非接触的线性化计量工具。电涡流传感器能准确测量被测体（必须是金属导体）与探头端面之间静态和动态的相对位移变化。电涡流传感器的原理是，通过电涡流效应的原理，准确测量被测体(必须是金属导体)与探头端面的相对位置，其特点是长期工作可靠性好、灵敏度高、抗干扰能力强、非接触测量、响应速度快、不受油水等介质的影响，常被用于对大型旋转机械的轴位移、轴振动、轴转速等参数进行长期实时监测，可以分析出设备的工作状况和故障原因，有效地对设备进行保护及预维修。

传感器经常作为自动化产品的一部分，在我们日常生产生活中扮演着重要角色。它是现代科技的前沿技术，其水平高低也是衡量一个国家科技发展水平的重要标志之一。市面上的传感器多种多样，玲琅满目，可供我们选择的有很多。电感涡流传感器等众多高性能传感器，被大量应用在各行各业。特别是机床行业，以及汽车制造等行业更是应用广泛，是国内外公认的具有发展前途的高技术产业。

在高速旋转机械和往复式运动机械的状态分析，振动研究、分析测量中，对非接触的高精度振动、位移信号，能连续准确地采集到转子振动状态的多种参数。如轴的径向振动、振幅以及轴向位置。从转子动力学、轴承学的理论上分析，大型旋转机械的运动状态，主要取决于其核心—转轴，而电涡流传感器，能直接非接触测量转轴的状态，对诸如转子的不平衡、不对中、轴承磨损、轴裂纹及发生摩擦等机械问题的早期判定，可提供关键的信息。电涡流传感器以其长期工作可靠性好、测量范围宽、灵敏度高、分辨率高、响应速度快、抗干扰力强、不受油污等介质的影响、结构简单等优点，在大型旋转机械状态的在线监测与故障诊断中得到广泛应用 。

根据法拉第电磁感应原理，块状金属导体置于变化的磁场中或在磁场中作切割磁力线运动时（与金属是否块状无关，且切割不变化的磁场时无涡流），导体内将产生呈涡旋状的感应电流，此电流叫电涡流，以上现象称为电涡流效应。而根据电涡流效应制成的传感器称为电涡流式传感器。

Bently探头330103-00-04-10-02-00

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前置器中高频振荡电流通过延伸电缆流入探头线圈，在探头头部的线圈中产生交变的磁场。当被测金属体靠近这一磁场，则在此金属表面产生感应电流，与此同时该电涡流场也产生一个方向与头部线圈方向相反的交变磁场，由于其反作用，使头部线圈高频电流的幅度和相位得到改变（线圈的有效阻抗），这一变化与金属体磁导率、电导率、线圈的几何形状、几何尺寸、电流频率以及头部线圈到金属导体表面的距离等参数有关。通常假定金属导体材质均匀且性能是线性和各项同性，则线圈和金属导体系统的物理性质可由金属导体的电导率б、磁导率ξ、尺寸因子τ、头部体线圈与金属导体表面的距离D、电流强度I和频率ω参数来描述。则线圈特征阻抗可用Z=F(τ, ξ, б, D, I, ω)函数来表示。通常我们能做到控制τ, ξ, б, I, ω这几个参数在一定范围内不变，则线圈的特征阻抗Z就成为距离D的单值函数，虽然它整个函数是一非线性的，其函数特征为“S”型曲线，但可以选取它近似为线性的一段。于此，通过前置器电子线路的处理，将线圈阻抗Z的变化，即头部体线圈与金属导体的距离D的变化转化成电压或电流的变化。输出信号的大小随探头到被测体表面之间的间距而变化，电涡流传感器就是根据这一原理实现对金属物体的位移、振动等参数的测量。

当被测金属与探头之间的距离发生变化时，探头中线圈的Q值也发生变化，Q值的变化引起振荡电压幅度的变化，而这个随距离变化的振荡电压经过检波、滤波、线性补偿、放大归一处理转化成电压（电流）变化，完成机械位移(间隙)转换成电压（电流）。由上所述，电涡流传感器工作系统中被测体可看作传感器系统的一半，即一个电涡流位移传感器的性能与被测体有关。

按照电涡流在导体内的贯穿情况，此传感器可分为高频反射式和低频透射式两类，但从基本工作原理上来说仍是相似的。电涡流式传感器的特点是能对位移、厚度、表面温度、速度、 应力、材料损伤等进行非接触式连续测量，另外还具有体积小，灵敏度高，频率响应宽等特点，应用较其广泛。

电涡流传感器系统以其独特的优点，广泛应用于电力、石油、化工、冶金等行业，对汽轮机、水轮机、发电机、鼓风机、压缩机、齿轮箱等大型旋转机械的轴的径向振动、轴向位移、鉴相器、轴转速、胀差、偏心、油膜厚度等进行在线测量和安全保护，以及转子动力学研究和零件尺寸检验等方面。

电感线圈产生的磁力线经过金属导体时，金属导体就会产生感应电流，且呈闭合回路，类似于水涡流形状，故称之为电涡流也叫做电涡流效应，其实是电磁感应原理的延伸。

传感器探头里有小型线圈，由控制器控制产生震荡电磁场，当接近被测体时，被测体表面会产生感应电流，而产生反向的电磁场。这时电涡流传感器根据反向电磁场的强度来判断与被测体之间的距离。注意：电涡流传感器要求被测体必须是导体。