Formula known when the coil is effe

Formula known when the coil is effective detection range and the relative permeability of non metal is approximate to 1, center of the coil of the magnetic induction intensity remained unchanged, when the coil effective detection range of ferromagnetic metal, relative permeability will be larger, the larger the magnetic induction strength will be.
(2) the eddy current effect: Based on the theory of electromagnetic field, when the metal metal objects placed on the change of the magnetic field to the body can produce self closed induction current, this is the eddy current effect of metal. Eddy current to produce additional magnetic field, and magnetic field in the opposite direction, weaken the external magnetic field. Therefore, when the metal near the generic alternating current of the detector coil, metal to produce the eddy current magnetic field to magnetic effect will weaken the coil magnetic field changes. The greater the electrical conductivity of the metal, alternating current frequency is, the greater is the eddy current intensity, on a magnetic field of inhibition is stronger.
Comprehensive analysis, when metal objects near the coil near the plane of the detection, whether it is medium permeability changes, or metal eddy current effect can be caused by a change in the magnetic induction intensity. For ferromagnetic metals due to the relative permeability is approximate to 1, so that is mainly a vortex effect, the magnetic effect is negligible; and ferromagnetic metal both to generate eddy current effect,

結果 (中文) 1:

已知时的线圈是有效探测距离和非金属相对渗透率的公式是近似为 1，中心线圈的磁感应强度保持不变，当铁磁金属、 相对渗透率的线圈有效检测范围将更大，较大的磁感应强度会。（2） 电涡流效应 ︰ 基于电磁场理论，当金属的金属物品放在磁场对身体的变化可以产生自我封闭的感应电流，这是金属的涡流效应。涡电流产生附加磁场，磁场方向相反，削弱外部磁场。因此，当附近泛型交变电流检测器的金属线圈，产生涡流电流磁场对磁效应的金属会削弱线圈磁场的变化。越多金属，交变电流频率的电导率，涡电流强度，磁场的抑制作用越大就会更强。磁感应强度的变化可以引起全面的分析，当金属物体接近线圈靠近飞机的检测，无论是介质渗透率的变化，还是金属的涡流效应。由于相对渗透率的铁磁金属是近似为 1，即主要涡的影响，磁效应是可以忽略不计;和铁磁金属都产生涡流效应，

結果 (中文) 3:

已知当线圈有效探测范围和非金属相对磁导率近似为1时，中心线圈的磁感应强度保持不变，当线圈有效探测范围为铁磁性金属时，相对磁导率会较大，磁感应强度越大。（2）涡流效应：基于电磁场理论，当金属物体置于磁场的变化时，可产生自封闭感应电流，这是金属的涡流效应。涡流产生附加磁场，而磁场方向相反，削弱了外加磁场。因此，当金属附近的检测线圈的通用交流电流，金属产生的涡流磁场的磁效应会减弱线圈磁场的变化。金属的电导率越大，交流频率越大，越是涡流强度，对磁场的抑制作用更强。综合分析，当金属物体附近的线圈附近的检测，无论是介质渗透性的变化，或金属涡流效应可以引起的变化的磁感应强度。对于铁磁性金属由于相对磁导率近似为1，所以这主要是一种涡旋效应，其磁性效应是可以忽略不计的；而铁磁性金属既能产生涡流效应，