| 摘要 |
<p>The invention relates to a sensor for determining the velocity of fluids. According to the invention, the sensor comprises two circular scales () whereto there are attached some magnetic base plate (), each magnetic base plate being associated with a sphere-shaped permanent magnet (), each magnet being mounted in one corner of a tetrahedral structure () so that the magnets are rejected by the magnetic fields of the magnetic base plates, the resultants of the rejection forces acting along the directions which join the symmetry centre of the tetrahedral structure () with its apices, the tetrahedral structure () being maintained in magnetic levitation, in the middle of structure () there being located a magnetized sphere (), integral with the structure, and on the axes of a Cartesian system which originates in the centre of the sphere determined by the circular scales (), there are mounted, at equal distances from the symmetry centre of the tetrahedron, some magnetic sensors () whose output signals are determined by the position of the magnetized sphere () and are converted into digital quantities by an analogue-to-digital converter (), after which the signals are taken over by a processing unit () which calculates the displacement velocity of a fluid depending on the coordinates of the magnetic sphere () which is placed on the fluid flowing path, the value of the displacement velocity being displayed on a display () and remotely transmitted by an RF module ().</p> |
