Systems and methods for non-intrusive and continuous level measurement in cylindrical vessels
A cylindrical container, liquid level measurement technology, used in radio wave measurement systems, liquid/fluid solid measurement, measurement devices, etc., to achieve the effect of easy cleaning, easy installation and replacement
Active Publication Date: 2019-11-22
ABB TECH AG
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In other words, the method is only applicable to containers with vertical walls
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[0038] figure 2 A first embodiment for level measurement in a horizontally placed cylindrical vessel 20 is shown. Container 20 contains liquid 22 up to a fill level or liquid level H. The interface between the liquid 22 and the air or another gas above the liquid 22 is called the liquid level interface 21 . The frequency-tunable transducer x1 is arranged at the outside of the wall of the container 20 and in this embodiment directly on top of the container 20 . The transducer x1 includes an ultrasonic transmitter and an ultrasonic receiver.
[0039] The transducer x1 is arranged to emit ultrasonic waves into the vessel wall as primordial Lamb waves (s1, s2) such that a part of the primordial lambda waves leaks from the vessel wall into the liquid in the form of pressure waves s3, s4. At least one electronic control and data processing unit 6 is adapted to vary the ultrasonic frequency of the transducer x1 until the transducer receives a reflection of the transmitted ultraso...
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The present invention proposes a system and method for non-invasive and continuous level measurement of a liquid surrounded by a solid wall of a horizontally positioned cylindrical container. The system comprises an ultrasonic transducer mounted at the outside of the vessel wall to generate and emit ultrasonic waves into the vessel wall, and at least one electronic device for controlling the operation of the transducer and for determining the liquid level from the time-of-flight of the ultrasonic waves. Control and data processing unit. The transducer is a frequency-tunable transducer arranged to emit ultrasonic waves as P-Lamb waves into the vessel wall such that a portion of the P-Lamb waves leak from the vessel wall into the liquid in the form of pressure waves. At least one electronic control and data processing unit is adapted to vary the ultrasonic frequency of the transducer until the transducer receives a reflection of the emitted ultrasonic wave in the form of a reflection of a pressure wave, determines the corresponding time-of-flight, and according to the time-of-flight and according to the emission and reflection The corresponding and predetermined travel length of the ultrasonic wave determines the liquid level.
Description
technical field [0001] The present invention relates to systems and methods for non-invasive and continuous liquid level measurement in cylindrical vessels. Background technique [0002] Liquid level sensors are used to determine the fill level of containers containing liquids. One type of commonly used container is a horizontally positioned cylindrical tank in which liquids can be stored and / or transported. [0003] Currently, liquid level measurement methods mainly apply intrusive techniques, which means that an opening in the wall of the container is required to introduce the liquid level sensor into the container. [0004] However, in certain industries, for example in the food or pharmaceutical industry, it is not desirable to have foreign bodies in close proximity or even in contact with liquids in order to avoid contamination. In even other fields, such as in the chemical or oil and gas industries, intrusive level measurement cannot be specified due to the liquid's e...
Claims
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IPC IPC(8): G01F23/296
CPCG01F23/296G01S7/527G01S7/539G01S15/101G01F23/2962G01F25/20
Inventor M.莱纳T.考夫曼D.帕佩
Owner ABB TECH AG