Electromagnetic method of liquid level monitoring
First Claim
1. A method for monitoring one or more parameters of a variable physical structure, comprising:
- placing an electrodynamic element in proximity to the monitored structure (3, 8);
exciting in said element an alternating electromagnetic field at a frequency at which the electromagnetic field penetrates into the monitored structure (3, 8);
measuring of the variation of at least one of the electromagnetic field parameters of said element caused by variation of the structure;
said exciting of said element is by an electromagnetic field in the form of at least one slowed electromagnetic wave having suitable energy distribution of the electric and magnetic fields for the measuring of the variation of the propagation constant of the electromagnetic field, as said electromagnetic field parameter.
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Abstract
A method and apparatus for monitoring one or more parameters of a variable physical structure, such as liquid level, is disclosed. The method and apparatus includes an electrodynamic element placed in proximity to a monitored structure and exciting within said element an alternating electromagnetic field. The electromagnetic field should be at a frequency at which the electromagnetic field penetrates into the monitored structure and then variations of the electromagnetic field parameters are measured for the element caused by a variation in the structure. The exciting of the electrodynamic element is by an electromagnetic field in the form of at least one slowed electromagnetic wave having suitable energy distribution of the electric and magnetic fields for the measuring of the electromagnetic field parameters.
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Citations
54 Claims
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1. A method for monitoring one or more parameters of a variable physical structure, comprising:
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placing an electrodynamic element in proximity to the monitored structure (3, 8);
exciting in said element an alternating electromagnetic field at a frequency at which the electromagnetic field penetrates into the monitored structure (3, 8);
measuring of the variation of at least one of the electromagnetic field parameters of said element caused by variation of the structure;
said exciting of said element is by an electromagnetic field in the form of at least one slowed electromagnetic wave having suitable energy distribution of the electric and magnetic fields for the measuring of the variation of the propagation constant of the electromagnetic field, as said electromagnetic field parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An apparatus monitoring one or more parameters of variable physical structure, comprising:
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an electrodynamic element 1, a measuring circuit, including at least radio frequency generator 5, a primary transducer 6 and a converter converting an electric signal into the parameter;
said electrodynamic element 1 includes an input 12, an output 13 of RF signal and a section of a slow-wave structure 11 set to distribute in a given ratio the components of an electric and magnetic fields in the monitored structure (“
a multipole”
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said slow-wave structure further including at least two conductors 14, 16, at least one of them being an impedance conductor 14 facing the monitored structure and fashioned as row of conducting members 50 arranged in series in the direction of the slowed wave propagation and connected to one another with spacing 52. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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Specification