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    Measurement system of ferromagnetic particles
    1.
    发明授权
    Measurement system of ferromagnetic particles 有权
    铁磁颗粒测量系统

    公开(公告)号：US09030193B2

    公开(公告)日：2015-05-12

    申请号：US13522676

    申请日：2011-01-19

    申请人： Arvi Kruusing

    发明人： Arvi Kruusing

    IPC分类号： G01N27/74 ,  G01N33/28

    CPC分类号： G01N33/2888 ,  G01N27/74

    摘要： A system by which the proportion of ferromagnetic particles in a dielectric medium is measured. A magnetic field is generated by two signals in the medium: a low frequency feed and a relatively high frequency excitation. The feed magnetizes the ferromagnetic particles in the medium to the nonlinear range of the magnetization curve. The excitation is generated so that its spectrum is relatively wide and it is dense with frequency components. The level of the excitation is so high that the magnetic flux density in the medium corresponding to the excitation fluctuates nonlinearly, when the feed is at its peak value or near this. The magnetic field of the medium is measured by a secondary winding, and from the response signal produced by the sensor is detected the part resulting from the magnetic non-linearity, which part is the output signal. In the detection the response is multiplied by the signal, which arises magnetic field and includes the same random fluctuation as the response. The higher the proportion of the ferromagnetic particles in the medium is, the higher the level of the output signal. The secondary winding comprises several portions so that the parasitic voltages caused by the stray capacitances compensate each other. The measurement is real-time and accuracy, because the excitation is a random signal by nature, in which case its spectrum includes, instead of one frequency component, densely frequency components in a certain band. The result is a 20-30 dB higher signal-to-noise ratio in the response and output signal compared with the known technique. A device according to the method is suitable for use in an industrial plant and moving vehicles, in which there are interfering fields and the temperature can be high.

    摘要翻译： 测量电介质介质中铁磁颗粒比例的系统。 在介质中由两个信号产生磁场：低频进给和较高频率的激励。 进料将介质中的铁磁颗粒磁化成磁化曲线的非线性范围。 产生激发，使其光谱相对较宽，并且其频率分量密集。 励磁电平如此高，使得与激励对应的介质中的磁通密度在非线性时波动，当进给处于其峰值或接近该值时。 通过次级绕组测量介质的磁场，并从传感器产生的响应信号中检测出由非磁性部分产生的部分，该部分是输出信号。 在检测中，响应乘以信号，其产生磁场并且包括与响应相同的随机波动。 介质中铁磁颗粒的比例越高，输出信号的电平越高。 次级绕组包括若干部分，使得由杂散电容引起的寄生电压彼此补偿。 测量是实时和准确的，因为激励是自然的随机信号，在这种情况下，其频谱不包括一个频率分量，在一定频带内密集频率分量。 结果是与已知技术相比，响应和输出信号中的信噪比要高20-30dB。 根据该方法的装置适用于存在干扰场和温度高的工业厂房和移动车辆。

    Measurement System of Ferromagnetic Particles
    3.
    发明申请
    Measurement System of Ferromagnetic Particles 有权
    铁磁颗粒测量系统

    公开(公告)号：US20120299584A1

    公开(公告)日：2012-11-29

    申请号：US13522676

    申请日：2011-01-19

    申请人： Arvi Kruusing

    发明人： Arvi Kruusing

    IPC分类号： G01N27/74

    CPC分类号： G01N33/2888 ,  G01N27/74

    摘要： A system by which the proportion of ferromagnetic particles in a dielectric medium is measured. A magnetic field is generated by two signals in the medium: a low frequency feed and a relatively high frequency excitation. The feed magnetizes the ferromagnetic particles in the medium to the nonlinear range of the magnetization curve. The excitation is generated so that its spectrum is relatively wide and it is dense with frequency components. The level of the excitation is so high that the magnetic flux density in the medium corresponding to the excitation fluctuates nonlinearly, when the feed is at its peak value or near this. The magnetic field of the medium is measured by a secondary winding, and from the response signal produced by the sensor is detected the part resulting from the magnetic non-linearity, which part is the output signal. In the detection the response is multiplied by the signal, which arises magnetic field and includes the same random fluctuation as the response. The higher the proportion of the ferromagnetic particles in the medium is, the higher the level of the output signal. The secondary winding comprises several portions so that the parasitic voltages caused by the stray capacitances compensate each other. The measurement is real-time and accuracy, because the excitation is a random signal by nature, in which case its spectrum includes, instead of one frequency component, densely frequency components in a certain band. The result is a 20-30 dB higher signal-to-noise ratio in the response and output signal compared with the known technique. A device according to the method is suitable for use in an industrial plant and moving vehicles, in which there are interfering fields and the temperature can be high.

    摘要翻译： 测量电介质介质中铁磁颗粒比例的系统。 在介质中由两个信号产生磁场：低频进给和较高频率的激励。 进料将介质中的铁磁颗粒磁化成磁化曲线的非线性范围。 产生激发，使其光谱相对较宽，并且其频率分量密集。 励磁电平如此高，使得与激励对应的介质中的磁通密度在非线性时波动，当进给处于其峰值或接近该值时。 通过次级绕组测量介质的磁场，并从传感器产生的响应信号中检测出由非磁性部分产生的部分，该部分是输出信号。 在检测中，响应乘以信号，其产生磁场并且包括与响应相同的随机波动。 介质中铁磁颗粒的比例越高，输出信号的电平越高。 次级绕组包括若干部分，使得由杂散电容引起的寄生电压彼此补偿。 测量是实时和准确的，因为激励是自然的随机信号，在这种情况下，其频谱不包括一个频率分量，在一定频带内密集频率分量。 结果是与已知技术相比，响应和输出信号中的信噪比要高20-30dB。 根据该方法的装置适用于存在干扰场和温度高的工业厂房和移动车辆。