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    • 39. 发明授权
    • Rheometer
    • 流变仪
    • US5040410A
    • 1991-08-20
    • US435705
    • 1989-11-13
    • Benjamin ChuRolf Hilfiker
    • Benjamin ChuRolf Hilfiker
    • G01N11/10
    • G01N11/105
    • A magnetic sphere or needle rheometer which may be fully controlled by a personal computer is provided. The rheometer is capable of measuring viscosities in the range of 5.times.10.sup.-4 to 5.times.10.sup.4 Pas (0.5 cP to 5.times.10.sup.7 cP). It can operate at shear rates between 1 s.sup.-1 and 2.times.10.sup.-4 s.sup.-1 and measure relaxation times down to 100 ms. The rheometer includes a magnetic coil which is used to maintain the sphere or needle in a selected position within a sample cell. The current required to maintain the sphere or needle in this position as the sample cell is moved up or down is measured. The viscosity of the liquid can be calculated from the difference in current flowing through the coil when the cell is stationary and when it is moved at a constant velocity.
    • 提供可由个人计算机完全控制的磁球或针流变仪。 流变仪能够测量5×10 -4至5×10 4帕斯(0.5cP至5×107cP)范围内的粘度。 它可以在1 s-1和2x10-4 s-1之间的剪切速率下运行,并测量100 ms的松弛时间。 流变仪包括用于将球体或针保持在样品池内的选定位置的磁性线圈。 测量当样品池向上或向下移动时将球或针保持在该位置所需的电流。 液体的粘度可以根据电池静止时以及以恒定速度移动时流过线圈的电流差来计算。