| 摘要 |
A non-intrusive through tank measurement method is provided for detecting liquid level inside a tank and for determining resistivity within the tank to determine materials in the tank. For ferromagnetic barrier materials, the method comprises the steps of determining the conductivity and permeability of the barrier, creating a first set of electromagnetic waves adjacent to the material to be measured of a relatively low frequency, impinging the first set of electromagnetic waves on the material for saturating the material, creating a second set of electromagnetic waves having specific constant amplitude of a higher frequency than the first of electromagnetic waves, the second set of electromagnetic waves for engaging the material and generating a sensing signal having modified characteristics, and receiving the sensing signal through the saturated material such that the modified characteristics of the sensing signal are processed to determine the required information of liquid level and/or liquid type.
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