| 摘要 |
An apparatus and systems used to measure the height of a liquid in a well or a tank and in particular to those apparatus and systems which use coherent light or laser for such measurement. The apparatus and systems will also measure respective elevations of multiple overlying immiscible fluid layers. The method entails generating coherent light or laser beams and the timing of its travel to either a liquid surface or floating object and its return to a receiving sensor. The timing of the receipt of the signals is processed to determine the relative height of a fluid surface in a chemical or fuel tank or groundwater well. The apparatus and systems provide multiple improvements over current methods of measuring fluid levels in wells and tanks. Improvements include increased accuracy due to reduction in human error when making measurements and elimination of environmental hazards involving the release and spreading of contaminants in soil and groundwater as can be caused by several current measurement methods.
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