Ince the magnetic field inside the tube excited by the excitation
Ince the magnetic field inside the tube excited by the excitation coils is nonuniform inside the radial direction, the output voltages might be distinct when the passing through metal debris present at different radial positions, that will lead to inaccurate estimation of the metal debris. The magnetic field distribution of your sensor is simulated by COMSOL software, and also the outcome is shown in Figure ten. In Figure ten, the two sets of excitation coils are wound in opposite Streptonigrin Epigenetic Reader Domain directions. The plane perpendicular towards the axis of your coil is taken as the Z = 0 plane in the midpoint of a set of excitation coils. We are able to simply confirm the non-uniform distribution on the magnetic field inside the radial direction. B0 is definitely the magnetic flux density at z = 0 and r = 0 (together with the center with the specific excitation coils as origin). B(r) represents the magnetic flux density along the r direction within the plane of z = 0. In Figure 11, the connection among relative magnetic flux density B(r)/B0 as well as the location on r path is provided. It can be inferred that the maximum measurement error in the sensor is about 10 . For experimental verification, a 300 m ferrous metal debris is chosen, together with the very same velocity but at distinct radial positions. The test final results are shown in Figure 12. V0 is definitely the voltage output when metal debris passes via the center with the sensor. It may be noticed that the error caused by the difference in the radial position is within 12 . This really is due to the existence of error inside the experimental process, reFigure ten. The magnetic flux density distributionan excitation coil. sulting in magnetic flux density distribution experimental benefits Figure ten. 10. The magnetic flux density distribution of an excitation coil. and simulation results. Figure The a certain difference among theof of an excitation coil.Figure 11. 11. Radial distributionrelative magnetic flux density at zat z = 0. Figure 11. Radial distribution of relative magnetic flux density at z = 0. Figure Radial distribution of of relative magnetic flux density = 0.Sensors 2021, 21,ten ofFigure 11. Radial distribution of relative magnetic flux density at z = 0.Figure 12. The output voltage relative to r = 0 worth when metal debris passes via different Figure 12. The output voltage relative to r = 0 value when metal debris passes by means of different radial positions. radial positions.5.4. Influence on the Axial Distribution of Metal Debris on the Output Voltage Throughout the operation of machinery and equipment, (-)-Irofulven Purity additional than 1 metal debris particle is made. When the spacing amongst two metal debris particles is too quick, the voltages they generate are going to be superimposed, making it hard to recognize the true size from the metal debris. Two metal debris particles of the identical size had been chosen for the experiment and passed via the sensor with unique spacing along with the identical speed (0.two m/s), and the output outcomes are shown in Figure 13. The induced voltages of adjacent debris at unique intervals are shown in Figure 13. In the experimental final results, it’s obvious that when the spacing is much less than 25 mm, the output voltage signals are fully superimposed together, and when the spacing is higher than 90 mm, the output voltage signals are absolutely separated. five.five. Sensor’s Speed Characteristic To verify the impact on the speed of metal debris passage around the sensitivity on the sensor. We select 200 ferrous metal debris for the experiment. Similarly, the excitation signal is 0.