| 摘要 |
Conventional liquid-level gauging systems have a sensor with a reflector mounted in a tube extending above a transducer and which is filled with liquid to the same height as outside the tube. The reflector provides a reference reflection against which reflection from the liquid surface can be calibrated. The present invention is less prone to thermal stratification effects by having multiple reflectors and a processor that calculates liquid height from the ratio of the difference between the arrival times of pulses reflected from the two uppermost submerged reflectors and the difference between the arrival times of pulses reflected from the surface of the liquid and the uppermost submerged reflector.
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