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    • 10. 发明授权
    • Method and apparatus for measuring dry density and water content of soil
    • 用于测量土壤干密度和含水量的方法和装置
    • US07040145B2
    • 2006-05-09
    • US10779899
    • 2004-02-17
    • Vincent P. DrnevichXiong Yu
    • Vincent P. DrnevichXiong Yu
    • G01N25/56G01N5/02G01R27/04G01R27/32
    • G01N33/246
    • A method and apparatus for measuring dry density and gravimetric water content of soil includes the steps of providing a plurality of spikes adapted to be driven into the soil and driving the spikes into the soil in spaced relationship. An electrical signal is applied to the spikes and a reflected signal is analyzed using time domain reflectometry to determine an apparent dielectric constant and the bulk electrical conductivity of the soil. With these parameters, the dry density and gravimetric water content of the soil can be calculated using a predetermined relationship between apparent dielectric constant, bulk electrical conductivity, dry density and gravimetric water content. The predetermined relationship includes experimentally determined soil specific calibration constants. The calculated value of the bulk electrical conductivity as determined by time domain reflectometry is adjusted to correspond to a value for which values of the constants are known. The value of the apparent dielectric constant is adjusted to compensate for temperature.
    • 用于测量土壤的干密度和重量含水量的方法和装置包括以下步骤:提供多个适于被驱动进入土壤中的尖峰,并以相互间隔的关系将尖峰驱动到土壤中。 电信号施加到尖峰,并且使用时域反射测量法分析反射信号以确定表观介电常数和土壤的体电导率。 通过这些参数,可以使用表观介电常数,体电导率,干密度和重量含水量之间的预定关系来计算土壤的干密度和重量含水量。 预定的关系包括实验确定的土壤特异性校准常数。 通过时域反射计测定的体电导率的计算值被调整以对应于常数值已知的值。 调整表观介电常数的值以补偿温度。