Measuring and testing – Liquid level or depth gauge
Patent
1988-06-13
1990-01-02
Shoap, Allan N.
Measuring and testing
Liquid level or depth gauge
340621, G01F 2328
Patent
active
048904902
ABSTRACT:
Ultrasonic Lamb waves are launched into a thin-section metal plate (10) which extends generally vertically above the contents of a vessel. As long as the lower end (18) of the plate (10) is above the liquid level, the Lamb waves are reflected at the lower boundary to give a full amplitude return signal. If however the liquid level rises into contact with the plate, mode conversion occurs at the interface between the plate and the liquid resulting in a reduced amplitude return signal. The arrangement may be used as a limit switch or may be calibrated to enable the liquid level to be related to the strength of the return signal. In a more elaborate arrangement, the plate (10) is of stepped configuration so as to present a series of shoulders (20A, 20B) at different heights. Each shoulder gives rise to a respective return signal and analysis of the return signals allows the liquid level to be determined. The plate may be tens of meters in length and may be used as a level sensor in the primary vessel of a nuclear reactor. The transducer and associated electronics may therefore be located remotely from the liquid level (e.g. externally of the reactor vessel).
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Gillespie et al, "A New Ultrasonic Technique for the Measurement of Liquid Level", Ultrasonics, Jan. 1982, pp. 13-17.
Hinds William R.
Shoap Allan N.
United Kingdom Atomic Energy Authority
Will Thomas B.
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