公开(公告)号：EP0077305A1

公开(公告)日：1983-04-20

申请号：EP82830234.9

申请日：1982-09-16

申请人： Assenza, Donello

发明人： Assenza, Donello

IPC分类号： G01N9/20

CPC分类号： G01N9/20

摘要： A float constituted by a hollow body of a dielectric material (5) having on the top a metallic conducting disk (16) made from a non ferromagnetic material and on the bottom a permanent magnet (6), is immerged in the liquid (2) in a chalix shaped container (7) where on the exterior of the hollow stem there is a winding (8) constituting an electromagnet driven by the current supplied by the differential amplifier (12).
The float (5, 6, 16) assumes in the liquid a fixed position in virtue of feed-back effect produced by eddy currents positionvoltage transducer (18, 15, 17). The current flowing in the electromagnet is proportional, at less than a constant due to the weight of the float (5, 6, 16) to the hydrostatic buoyancy that is to say, to the specific gravity of the liquid.
The fixed position of the float (5, 6, 16) makes the measure independent by the spatial non linearities of the magnetic field and, by non linearity of the positionvoltage transducer (18, 15, 17).
The centering action of electromagnet (8) on the magnet (6) avoids the friction with the walls around the float (5, 6, 16), that remain suspended in the liquid.

摘要翻译： 由电介质材料（5）的中空体构成的浮子由在非磁性材料制成的金属导电盘（16）的顶部和永磁体（6）的底部浸入液体（2）中 一个镶嵌形状的容器（7），其中在中空杆的外部上有一个绕组（8），构成由差动放大器（12）提供的电流驱动的电磁体。 由于由涡流位置电压传感器（18,15,17）产生的反馈效应，浮子（5,6,16）在液体中呈现固定位置。 由于浮子（5,6,16）的重量与静压浮力的关系，流过电磁体的电流成比例，小于常数。 到液体的比重。 浮子（5,6,16）的固定位置使得测量值与磁场的空间非线性度和位置电压换能器（18,15,17）的非线性度无关。 电磁体（8）对磁体（6）的定心作用避免了与悬浮在液体中的浮子（5,6,16）周围的壁的摩擦。