WO2012083745A1 - 一种可以检测磁场和磁导率的电磁流量计传感器 - Google Patents

一种可以检测磁场和磁导率的电磁流量计传感器 Download PDF

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Publication number
WO2012083745A1
WO2012083745A1 PCT/CN2011/080559 CN2011080559W WO2012083745A1 WO 2012083745 A1 WO2012083745 A1 WO 2012083745A1 CN 2011080559 W CN2011080559 W CN 2011080559W WO 2012083745 A1 WO2012083745 A1 WO 2012083745A1
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Prior art keywords
measuring tube
excitation
line
magnetic
magnetic field
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PCT/CN2011/080559
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English (en)
French (fr)
Inventor
张振山
张光瑞
张�林
黄小燕
黄跃刚
赵润
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SHANGHAI WELLTECH AUTOMATION CO Ltd
SHANGHAI WELLTECH INSTRUMENT CO Ltd
Northeastern University China
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SHANGHAI WELLTECH AUTOMATION CO Ltd
SHANGHAI WELLTECH INSTRUMENT CO Ltd
Northeastern University China
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Priority to BR112013015868A priority Critical patent/BR112013015868B8/pt
Priority to AU2011348795A priority patent/AU2011348795B2/en
Publication of WO2012083745A1 publication Critical patent/WO2012083745A1/zh
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/586—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters constructions of coils, magnetic circuits, accessories therefor

Definitions

  • the invention belongs to the technical field of measuring flow, and relates to an electromagnetic flowmeter sensor, in particular to an electromagnetic flowmeter sensor capable of detecting a magnetic field and a magnetic permeability.
  • the development history of electromagnetic flowmeters is also a history of the development of excitation methods from the perspective of magnetic fields. From the perspective of how to stabilize and compensate the magnetic field, the excitation method mainly has the following four development stages:
  • reference line ⁇ also called reference line ⁇
  • reference line ⁇ was once mistaken for magnetic field feedback. Careful research has found that the reference ⁇ and the excitation line are entangled in the past, and most of the signal is the induced voltage caused by the change of the leakage flux component. The signal component generated by the main measurement flux change is small, so the change of the magnetic field is reflected. Very limited, essentially the excitation voltage feedback.
  • the existing electromagnetic flowmeter sensor has a measurement value that is not accurate and the performance is unstable in the case of a change in magnetic permeability. Summary of the invention
  • the technical problem to be solved by the present invention is to provide an electromagnetic flowmeter sensor capable of detecting a magnetic field and a magnetic permeability, and the electromagnetic flowmeter sensor can measure a fluid having a variable magnetic permeability.
  • the present invention adopts the following technical solutions.
  • An electromagnetic flowmeter sensor capable of detecting a magnetic field and a magnetic permeability comprising a flange and a measuring tube, the flange being mounted at two ends of the measuring tube, wherein the measuring tube is fixed with a reference line ⁇ and an exciting line ⁇ The reference line ⁇ and the excitation line ⁇ are individually wound and spaced apart by a certain distance.
  • the exciting wire is fixed to the outer side wall of the measuring tube, and the reference wire is wound into an elongated shape, and the center axis of the exciting wire is installed in the middle of the exciting wire.
  • the reference line ⁇ is adjacent to the outer side wall of the measuring tube, - The test line ⁇ is larger than the excitation line ⁇ , and the excitation line ⁇ is surrounded by ⁇ .
  • the outer side wall of the measuring tube is provided with a magnetic circuit board, and both ends of the magnetic circuit board pass through the pole The shoe is fixed to the measuring tube, and the reference wire is wound around the magnetic circuit board.
  • the outer side wall of the measuring tube is provided with a magnetic circuit board, and both ends of the magnetic circuit board are fixed on the measuring tube through the pole piece, and the excitation wire is fixed on one of the pole pieces.
  • the thread is fixed on the other pole piece.
  • the reference line ⁇ is a line or a plurality of turns connected in series. The invention has the beneficial effects that: the electromagnetic flowmeter sensor of the invention can measure the fluid with variable magnetic permeability, and the proportion of the signal reflecting the main magnetic flux change in the reference coil signal is improved.
  • FIG. 1 is a front view of an electromagnetic flowmeter adopting a center-axis winding method according to Embodiment 1;
  • FIG. 2 is a plan view of an electromagnetic flowmeter adopting a center-axis winding method according to Embodiment 1;
  • FIG. 4 is a plan view of the electromagnetic flowmeter adopting the surrounding winding method according to the second embodiment;
  • FIG. 5 is a top view of the electromagnetic flowmeter adopting the surrounding winding method according to the second embodiment;
  • FIG. 6 is a top view of the electromagnetic flowmeter adopting the rosary winding method according to the third embodiment.
  • Embodiment 1 It is an object of the invention to achieve magnetic field feedback. From the history of the development of electromagnetic flowmeters, it is the inevitable result of the development of electromagnetic flowmeter technology, because only when the magnetic field is kept constant, or when the magnetic field changes, it can compensate in time to break through the limitations of the electromagnetic flowmeter, and is suitable for iron ore pulp. When the magnetic permeability changes, the measurement accuracy of the electromagnetic flowmeter in practical applications can be ensured, and the long-term stability of the electromagnetic flowmeter can be improved.
  • Embodiment 1 Embodiment 1
  • the embodiment provides an electromagnetic flowmeter sensor capable of detecting a magnetic field and a magnetic permeability, as shown in the figure.
  • the flange 11 is mounted at both ends of the measuring tube 12, and the outer side wall of the measuring tube 12 is fixed with a reference line 14 and an exciting line ⁇ 1 3 , the reference line ⁇ 14 and the excitation wire ⁇ 13 are individually wound and spaced apart.
  • the reference line ⁇ 14 is not wound with the excitation line ,13, and is separated from the excitation line by a certain distance according to the assembly space; the reference line ⁇ 14 is not only a certain distance from the flange 11, but also has a certain distance from the electrode 15. .
  • the reference line can be made elongated, like the center line of the excitation line, installed in the middle of the excitation line, this installation method is called the center axis.
  • the central axis reference line ⁇ is suitable for large diameter electromagnetic flowmeters.
  • the reference line ⁇ can be one, or two, or several, in series.
  • the reference coil can be wound with an enameled wire, which is low in cost; it is also possible to use single or multiple flexible boards, which is consistent.
  • the number of turns of the reference line ⁇ is determined experimentally according to the voltage that the converter circuit can match. Generally, when the rated excitation is performed, the output reference signal strength is about 100 mA.
  • the ratio of the signal reflecting the main magnetic flux change in the reference coil signal of the present invention is increased by more than 4 times compared with the conventional reference coil, and is substantially unaffected by the eddy current during AC excitation. This is a qualitative difference.
  • the traditional reference line ⁇ As the aperture of the sensor increases, the phase of the reference signal deviates from the phase of the measured magnetic field by up to 15 degrees due to the influence of the eddy current, resulting in partial orthogonal interference being converted into in-phase interference.
  • the reference line ⁇ in the invention the phase difference between the reference signal and the actual measured magnetic field can be controlled within 1 degree, thereby stabilizing the zero point and improving the measurement accuracy.
  • the difference between this embodiment and the first embodiment is shown in FIGS. 3 and 4.
  • the flange 23 is mounted on both ends of the measuring tube 24, and the outer side wall of the measuring tube 24 is fixed with a reference line 25 and a field line 22, and a reference line ⁇ 25 Close to the outer casing of the measuring tube 24, the reference line ⁇ 25 is larger than the exciting line ⁇ 22, and the excitation line ⁇ 22 is enclosed, that is, the surrounding type.
  • This mounting method is suitable for the medium-diameter electromagnetic flowmeter.
  • Excitation line 22 is fixed around the magnetic circuit board, and the magnetic circuit board is fixed to the outer side wall of the measuring tube 24 through the pole piece 21.
  • the electrode is disposed at a distance from the reference line ⁇ 25 on the outer sidewall of the measuring tube 24.
  • FIGS. 5 and 6 The difference between this embodiment and the first embodiment is shown in FIGS. 5 and 6.
  • the flange 33 is mounted on both ends of the measuring tube 34, and the outer side wall of the measuring tube 34 is fixed with a reference coil 35 and an exciting coil 32, and the exciting coil ⁇ 32 is fixed around the magnetic circuit board 36, and the magnetic circuit board 36 is fixed to the outer side wall of the measuring tube 34 through the pole piece 31.
  • the electrode is disposed on the outer side wall of the measuring tube 34 at a distance from the exciting coil 32.
  • the reference line ⁇ 35 is wound around the magnetic circuit board 36, that is, the rosary type, and this mounting method is suitable for a small-diameter electromagnetic magnetic flowmeter.
  • Embodiments 1 and 3 cannot be separated from the excitation line by a large distance, so the reference line can be wound around the magnetic circuit board and close to the electrode. The location, away from the pole boots.
  • the reference line ⁇ can be wound by one line or by a series of lines.
  • this embodiment differs from this embodiment and the third embodiment in that one of the pole pieces is provided with the excitation wire ⁇ , and the other of the pole pieces is mounted with the reference wire ⁇ .
  • This type of mounting is suitable for electromagnetic flowmeters with a particularly small diameter.
  • the flexible circuit board fixing method is adopted, which does not increase the cost and has good consistency.
  • the size of the reference coil is very large, not so large flexible circuit board, if not By using, several flexible circuit boards can be connected in series.
  • the use of enamelled wire winding has obvious cost advantages.
  • the enameled wire is a main type of winding wire. It consists of two parts: the conductor and the insulating layer. After the wire is annealed and softened, it is baked and baked.
  • the invention has the following advantages:
  • the reference line ⁇ signal of the present invention reflects the essential improvement of the composition of the measuring magnetic field, it is possible to realize the true magnetic field feedback of the electromagnetic flowmeter.
  • the theoretical and measured values of the equivalent magnetic field of the electromagnetic flowmeter differed little. Since AC excitation is generally used for industrial control, the fluid condition is complicated, and it is not convenient to calibrate all frequencies at the time of calibration.
  • the magnetic field feedback makes the meter coefficients of each frequency almost the same, and the better frequency can be selected according to the site conditions.
  • the state of the sensor can be diagnosed by calculating the change in magnetic permeability, whether a turn-to-turn short circuit occurs, the magnetic circuit is rusted, etc., and the change of the magnetic field is compensated, in the event of a failure, Reduce measurement error. If a turn-to-turn short circuit occurs, the permeability indication will become smaller, which will help to detect the fault.
  • the relative magnetic permeability detection method is not necessarily implemented online, and can also be used for offline detection. Input the constant sine wave excitation current, measure the reference line ⁇ waveform, and calculate the magnetic permeability. If the permeability does not change, the sensor has no associated fault.
  • This off-line method is particularly suitable for constant current square wave excitation electromagnetic flowmeters.
  • the description and application of the present invention are intended to be illustrative, and not intended to limit the scope of the invention. Variations and modifications of the embodiments disclosed herein are possible, and various alternative and equivalent components of the embodiments are well known to those of ordinary skill in the art. It is apparent to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, ratios, and other elements, materials and components without departing from the spirit or essential characteristics of the invention.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Description

一种可以检测磁场和磁导率的电磁流量计传感器 技术领域
本发明属于测量流量技术领域， 涉及一种电磁流量计传感器， 尤其涉 及一种可以检测磁场和磁导率的电磁流量计传感器。 背景技术
电磁流量计的发展史从磁场角度来看也是励磁方式的发展史。 励磁方 式从如何稳定和补偿磁场的角度， 主要有以下 4个发展阶段：
1. 最开始为恒压励磁。 有方波也有正弦波， 由于铜电阻随温度变化， 因而导致励磁电流变化， 引发磁场改变， 影响测量精度， 现已基本不 用。
2. 后来发展为恒流励磁。采用恒流励磁的电磁流量计在使用一段时间 之后需要检测电流是否发生变化， 如果发生变化， 需要重新调整回原 来的值， 或者把实测值输入电磁流量计进行软件补偿。 当代大部分电 磁流量计都采用这种方法。 这种方法的虽然适用于很多场合， 但在磁 导率发生变化的场合， 如铁矿浆， 磁路发生锈蚀等， 会影响测量精度, 长期稳定性也不够好。
3. 电流反馈。励磁电流实测值自动补偿变化，避免了励磁电流定期调 试或者补偿的麻烦， 但也无法适用于磁导率发生变化的场合， 缺点与 恒流励磁的情况相同。 另外， 由于在励磁电流换向的过程中， 电流对 励磁线圏会有力的沖击。 电磁流量计经过长时间运行， 绝缘层会发生 老化， 频繁的电磁力沖击可能导致匝间短路。 不管依靠恒电流保持磁 场稳定， 还是通过电流反馈来补偿磁场的变化， 一旦发生匝间短路， 磁场便会减弱， 导致流量测量值偏小。
4. 带参考线圏（也称参考线圏）， 一度被误认为是磁场反馈。 仔细研 究发现， 以前参考线圏与励磁线圏绕在一起， 信号中大部分为漏磁通 分量变化引起的感生电压， 主测量磁通变化所产生的信号分量很小， 所以反映磁场的变化很有限， 实质上基本为励磁电压反馈。 综上所述， 现有的电磁流量计传感器在磁导率变化的情况下， 获得 的测量值并不精确， 性能也不稳定。 发明内容
本发明所要解决的技术问题是： 提供一种可以检测磁场和磁导率的 电磁流量计传感器， 该电磁流量计传感器可以测量磁导率可变的流体。 为解决上述技术问题， 本发明采用如下技术方案。 一种可以检测磁场和磁导率的电磁流量计传感器， 包括法兰和测量 管， 所述法兰安装在测量管的两端， 所述测量管上固定有参考线圏和励 磁线圏， 所述参考线圏和励磁线圏单独缠绕并相距一定距离。 作为本发明的一种优选方案， 所述励磁线圏固定于测量管的外侧壁， 所述参考线圏绕制为细长形状， 如同励磁线圏的中轴安装在励磁线圏中 间。 作为本发明的另一种优选方案， 所述参考线圏贴近测量管的外侧壁， -考线圏比励磁线圏大一圏， 将励磁线圏包围起来 ε 作为本发明的再一种优选方案， 所述测量管的外侧壁设有磁路板， 磁路板的两端通过极靴固定于测量管上，所述参考线圏缠绕在磁路板上。 作为本发明的再一种优选方案， 所述测量管的外侧壁设有磁路板， 磁路板的两端通过极靴固定于测量管上， 励磁线圏固定在其中一个极靴 上， 参考线圏固定在另外一个极靴上。 作为本发明的再一种优选方案， 所述参考线圏为一个线圏或若干个 线圏串联而成。 本发明的有益效果在于： 本发明所述的电磁流量计传感器可以测量 磁导率可变的流体， 参考线圏信号中的反映主磁通变化的信号比例提高
4倍以上， 在交流励磁时基本不受涡电流影响， 从而稳定了零点， 提高了 测量精度。 附图说明
图 1为实施例一所述的采用中轴式绕线方式的电磁流量计的主视图； 图 2为实施例一所述的采用中轴式绕线方式的电磁流量计的俯视图； 图 3为实施例二所述的采用包围式绕线方式的电磁流量计的主视图； 图 4为实施例二所述的采用包围式绕线方式的电磁流量计的俯视图； 图 5为实施例三所述的采用念珠式绕线方式的电磁流量计的主视图； 图 6为实施例三所述的采用念珠式绕线方式的电磁流量计的俯视图。 主要组件符号说明:
11、 法兰； 12、 测量管；
1 3、 励磁线圏； 14、 参考线圏;
15、 电极； 21、 极靴；
22、 励磁线圏； 23、 法兰；
24、 测量管； 25、 参考线圏;
26、 电极； 31、 极靴；
32、 励磁线圏； 33、 法兰；
34、 测量管； 35、 参考线圏;
36、 磁路板。
具体实施方式 本发明的目的是实现磁场反馈。 由电磁流量计的发展史来看， 它是电 磁流量计技术发展的必然结果， 因为只有保持磁场不变， 或者磁场发生变 化时能够及时补偿， 才能突破电磁流量计的局限，适用于铁矿浆等磁导率 变化的场合， 才能保证电磁流量计在实际应用中的测量精度， 并提高电磁 流量计的长期稳定性。 下面结合附图对本发明的具体实施方式作进一步详细说明。 实施例一
本实施例提供一种可以检测磁场和磁导率的电磁流量计传感器， 如图
1和 2所示， 包括法兰 1 1和测量管 12 , 所述法兰 11安装在测量管 12的两端， 所述测量管 12的外侧壁固定有参考线圏 14和励磁线圏 1 3 , 所述参考线圏 14和励磁线圏 13单独缠绕并相距一段距离。所述参考线圏 14不与励磁线圏 13绕在一起， 根据装配空间尽可能离开励磁线圏一定距离； 参考线圏 14 不仅要距法兰 11一定距离， 而且距电极 15也要有一定距离。对于大口径， 由于励磁线圏本身已经靠近测量管的外侧， 所以可以将参考线圏制成细 长， 如同励磁线圏中轴， 安装在励磁线圏中间， 这种安装方式， 叫作中轴 式； 该中轴式参考线圏安装方式适合大口径电磁流量计。参考线圏可以是 一个， 也可以是两个、 或若干个串联而成。 参考线圏可以用漆包线绕制， 这样成本低； 也可以用单个或者多个柔性电路板， 这样一致性好。 参考线 圏的匝数根据转换器电路可匹配的电压，通过实验确定，一般使额定励磁 时， 输出的参考信号强度为 l OOmV左右。 总之要离开一定距离， 尽量避开 漏磁通的作用范围。 实验表明， 与传统参考线圏相比， 本发明专利所述参 考线圏信号中的反映主磁通变化的信号比例提高 4倍以上，在交流励磁时 基本不受涡电流影响。 这是有质的区别的。 采用传统的参考线圏， 随着传 感器口径的增大， 由于涡电流的影响，参考信号的相位会偏离测量磁场的 相位， 多达 15度， 导致部分正交干扰转化为同相干扰。 而采用本发明中的 参考线圏，可以将参考信号与实际测量磁场的相位差控制在 1度以内，从 而稳定了零点， 提高了测量精度。 实施例二
本实施例与实施例一得区别如图 3和 4所示， 法兰 23安装在测量管 24的 两端， 测量管 24的外侧壁固定有参考线圏 25和励磁线圏 22 , 参考线圏 25 贴近测量管 24的外壳， 参考线圏 25比励磁线圏 22大一圏， 将励磁线圏 22 包围起来， 即包围式， 这种安装方式适用于中口径电磁流量计。 励磁线圏 22围绕磁路板固定，磁路板通过极靴 21固定在测量管 24的外侧壁。 电极设 置于测量管 24的外侧壁上距离参考线圏 25的一定距离位置处。
实施例三
本实施例与实施例一得区别如图 5和 6所示， 法兰 33安装在测量管 34 的两端， 测量管 34的外侧壁固定有参考线圏 35和励磁线圏 32 , 励磁线圏 32围绕磁路板 36固定， 磁路板 36通过极靴 31固定在测量管 34的外侧壁。 电极设置于测量管 34的外侧壁上距离励磁线圏 32的一定距离位置处。 参 考线圏 35缠绕在磁路板 36上， 即念珠式， 这种安装方式适用于小口径电 磁流量计。 因为小口径电磁流量计的空间狭小， 实施例一和三所述的两 种方式都无法做到离开励磁线圏较大的距离， 所以可以将参考线圏绕在 磁路板上， 并且靠近电极的位置， 要远离极靴。 参考线圏可以由一个线 圏绕成， 也可以由若干个线圏串联起来构成。 实施例四
本实施例与实例三的区别在于， 其中一个极靴安装励磁线圏， 另一个 极靴安装参考线圏。 这种安装方式适用于特别小口径的电磁流量计。 参考线圏的制作一般有两方法， 一种是采用漆包线绕制， 另一种是用 柔性电路板制作。
对于口径小的电磁流量计传感器， 采用柔性电路板固定方法， 并不增 加成本， 而且一致性好。 对于口径大的电磁流量计传感器， 如直径为 2米 到 3米， 参考线圏的尺寸是很大的， 没有那么大的柔性电路板， 如果非要 采用， 可以将几个柔性电路板串联起来， 当然， 这种情况下采用漆包线绕 制具有明显的成本优势。漆包线是绕组线的一个主要品种， 由导体和绝缘 层两部组成， 棵线经退火软化后， 再经过多次涂漆， 烘焙而成。
参考线圏的固定方法多种多样， 但不管采用哪种方式， 一定得牢固， 不能使它的形状和位置有变动， 否则会影响测量精度。一种比较筒单的办 法是用玻璃纤维胶带将参考线圏粘在导管上，在粘之前，导管表面要清洁。 为保险起见， 昀好再用硅胶进行加固。 本发明具备以下优点：
1、 由于本发明的参考线圏信号中， 反映测量磁场的成份有了本质的 提高， 使电磁流量计实现真正意义上的磁场反馈成为可能。 实验表明， 电 磁流量计等效磁场的理论值和实测值相差很小。由于交流励磁一般用于工 业控制， 流体情况比较复杂， 在标定时不便于把所有频率都标定。 磁场反 馈使各频率的仪表系数相差无几， 可以根据现场情况选择昀佳的频率。
2、 可以测量磁导率可变的流体， 如铁矿浆， 突破了电磁流量计的禁 区。 对于铁精矿浆， 目前采用放射性元素测量浓度， 不但精度低， 而且因 为核辐射， 维护管理起来有危险性， 且成本高。 如果采用磁导率法测量铁 精矿的有效浓度， 不但安全方便， 而且由体积流量和浓度可以直接给出铁 精矿的质量流量。 实现了电磁流量计、铁精矿浆湿品位、 铁精矿质量流量 三表合一， 这在本领域是一个突破性进展， 将解决长期无法解决的问题。
3、 填补了现场校验的一大漏洞。 对于流体磁导率不发生变化的场合， 如水，可以通过计算磁导率的变化诊断传感器的状态，是否发生匝间短路， 磁路锈蚀等， 并补偿磁场的变化， 在出现故障的情况下， 减小测量误差。 如果发生匝间短路， 磁导率示值会变小， 所以有助于发现故障。 相对磁导 率的检测方法， 不一定在线实现， 也可以用于离线检测。 输入恒正弦波励 磁电流， 测参考线圏波形， 计算磁导率。 如果磁导率没有变， 说明传感器 没有相关故障。 这种离线方法特别适用于恒电流方波励磁电磁流量计。 这里本发明的描述和应用是说明性的， 并非想将本发明的范围限制在 上述实施例中。这里所披露的实施例的变形和改变是可能的，对于那些本 领域的普通技术人员来说实施例的替换和等效的各种部件是公知的。本领 域技术人员应该清楚的是， 在不脱离本发明的精神或本质特征的情况下， 本发明可以以其他形式、 结构、 布置、 比例， 以及用其他元件、 材料和部 件来实现。

Claims

权利要求书 、 一种可以检测磁场和磁导率的电磁流量计传感器， 包括法兰和测 量管， 所述法兰安装在测量管的两端， 其特征在于： 所述测量管 上固定有参考线圏和励磁线圏， 所述参考线圏和励磁线圏单独缠 绕并相距一定距离。 、根据权利要求 1 所述的可以检测磁场和磁导率的电磁流量计传感 器， 其特征在于： 所述励磁线圏固定于测量管的外侧壁， 所述参 考线圏绕制为细长形状， 如同励磁线圏的中轴安装在励磁线圏中 间。 、根据权利要求 1 所述的可以检测磁场和磁导率的电磁流量计传感 器， 其特征在于： 所述参考线圏贴近测量管的外侧壁， 参考线圏 比励磁线圏大一圏， 将励磁线圏包围起来。 、根据权利要求 1 所述的可以检测磁场和磁导率的电磁流量计传感 器， 其特征在于： 所述测量管的外侧壁设有磁路板， 磁路板的两端 通过极靴固定于测量管上， 所述参考线圏缠绕在磁路板上。 、根据权利要求 1 所述的可以检测磁场和磁导率的电磁流量计传感 器， 其特征在于： 所述测量管的外侧壁设有磁路板， 磁路板的两端 通过极靴固定于测量管上， 其中一个极靴固定有励磁线圏， 而另外 一个极靴上固定参考线圏。 、根据权利要求 1 所述的可以检测磁场和磁导率的电磁流量计传感 器，其特征在于：所述参考线圏为一个线圏或若干个线圏串联而成。
PCT/CN2011/080559 2010-12-22 2011-10-09 一种可以检测磁场和磁导率的电磁流量计传感器 Ceased WO2012083745A1 (zh)

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CN104375100A (zh) * 2013-08-12 2015-02-25 帅立国 一种差分式初始磁导率材质检测探头
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