Electromagnetic field how to isolate scale vortex flowmeter meet

Abstract: the scale vortex flowmeter in electromagnetic field how to isolate information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. The blocking problem of the magnetic field, is a practical problem with theory significance and meaning. According to different conditions, the screen can be divided into the electrostatic shielding of electromagnetic field, static magnetic shielding and electromagnetic shielding, three kinds of circumstances, the three situation has both qualitative difference, again. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a scale vortex flowmeter in electromagnetic field how to isolate the article details. The blocking problem of the magnetic field, is a practical problem with theory significance and meaning. According to different conditions, the screen can be divided into the electrostatic shielding of electromagnetic field, static magnetic shielding and electromagnetic shielding, three kinds of circumstances, the three situation has both qualitative difference, but also has internal, not confusion. Electrostatic shielding in static balance state, whether it's hollow conductor or solid conductor; No matter how much charged conductor itself, or whether the conductor in electric field, equipotential body, for its internal field intensity is zero, this is the basic theory of electrostatic shielding. Because the electric field inside the closed conductor shell has the typical significance and practical significance, we closed conductor shell electric field, for example make some discussions on the electrostatic shielding. （ A) Closed conductor shell internal electric field is not affected by an electric charge or shell electric field. Such as charged body and the shell outer shell has a charge q, electrostatic induction make shell outer wall charged. Electrostatic equilibrium when no electric field in the shell. This is not to say that an electric charge which produces an electric field is not in the shell, shell root farms. Due to a different shell outer wall induced charge, with q in the enclosed space as a stimulating and field strength is zero. Thus conductor inside the shell of an electric charge q from shell or other the influence of electric field. Shell and the outer wall of the induced charge on the automatic adjustment. If the above cavity enclosure grounding conductor, the shell induced positive charge will be along the earth wire into the underground. Electrostatic balance cavity after conductor and earth potential and field intensity remains in the cavity is zero. If the cavity with charge, the cavity conductor and equipotential, still no electric field in the conductor. At this time due to the cavity wall has a different number induced charge, so the cavity with electric field. The electric field generated by the shell charge, an electric charge shell still no influence of electric field inside the shell. By what has been discussed above, the closed shell no matter the grounding conductor or not, the internal electric field is not affected by an electric charge shell. （ 2) A closed shell conductor external electric field is not affected by the influence of shell charge. If there is a charge q shell cavity, because of electrostatic induction, the inner wall of the shell with a charge amount of different, shell outer wall with the same number with charge, shell outer space electric field exists, the electric field is produced by shell charge q indirectly. Also can saying is generated by the outside shell induced charge directly. But if the earthing, shell electric charge will disappear and the shell and the lining of induction electric charge q charge outside the shell to produce electric field is zero. Visible if you want to make the shell can not influence the charge of an electric field on the shell, shell must be grounded. This is different from * case. Here also must pay attention to: (1) we say that earth will eliminate shell electric charge, but is not to say that in any case shell outer wall must be electrically neutral. If have charged body outside shell, shell may still be charged on the outer wall, regardless of whether there is charge inside the shell. (2) the actual application of the metal shell don't have to be strictly completely closed, with a metal net instead of metal shell also can achieve similar electrostatic shielding effect, while the screen is not a complete and thorough. (3) in static equilibrium, is without charge flow in the earth wire, but if the blocked shell charge change over time, or the shell near the outside of the charged body charge change with time, makes the current in ground wire. Shield also possible residual charge when the shielding effect and is not completely and thoroughly. In short, closed shell no matter the grounding conductor or not, the internal electric field is not affected by shell electric charge and electric field; A closed shell conductor electric field is not affected by shell charge. This kind of phenomenon, called electrostatic shielding. Electrostatic shielding the meaning of two aspects: one is the real meaning: shielding metal conductor shell instrument or working environment is not affected by external electric field, or an external electric field. Some electronic devices or measuring equipment for interference cancellation, all want to practice the electrostatic shielding, such as indoor high voltage equipment hood grounded metal hood or relatively dense metal net, electronic worked metal shell. And as a full-wave rectifier or bridge rectifier power transformer, between the primary and secondary windings wound a layer of metal chips on the package or enameled wire and grounding, shielding effect. In the high voltage live working, workers put on a metal wire or conductive fibers are brought, can shield effect to human body. In the static experiments, because there are about 100 v/m near the earth vertical electric field. To exclude the electric field research on the role of electronics, electronic under gravity movement only, you must have the eE < Meg, can calculate E < 10 - 10 v/m, this is a little electrostatic field & other; Electrostatic vacuum & throughout; , this is only to into the vacuum cavity of electrostatic shielding can be achieved. In fact, from a closed cavity conductor implementation of electrostatic shielding is very effective. The second is theoretical significance: indirect validation of coulomb's law. Gauss theorem can be derived from coulomb's law, if the index of the inverse square of the coulomb's law is not equal to 2 out gauss theorem. On the other hand, if the gauss theorem, prove the correctness of the coulomb's law. Based on gauss theorem, insulated metal ball shell internal field strength should be zero, which is the conclusion of electrostatic shielding.

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