METHOD AND DEVICE FOR DETERMINING THE LEVEL L OF A LIQUID WITHIN A SPECIFIED MEASURING RANGE BY MEANS OF RADAR SIGNALS TRANSMITTED TO THE LIQUID SURFACE AND RADAR SIGNALS REFLECTED FROM THE LIQUID SURFACE
First Claim
1. A method for determining a level of a liquid within a specified measuring range, comprising the steps of:
- )transmitting radar signals to a surface of the liquid in time sequence;
receiving radar signals reflected from the liquid surface in time sequence; and
determining the liquid level based on the transmitted radar signals and the reflected radar signals by;
simultaneously carrying out two different calculation methods, wherein a first of the calculation methods generates a first measured value of the liquid level with a first error and a second of the calculation methods generates a second measured value of the liquid level with a second error, wherein the first calculation method is more sensitive to systematic deviations than the second calculation method, and wherein the second calculation method is more sensitive to strong fluctuations in the liquid level than the first calculation method;
analyzing fluctuations in the liquid level in time sequence; and
using one of the first and second measured values as the determined liquid level based on the fluctuations in the liquid level.
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Accused Products
Abstract
The invention relates to a method for determining the level L of a liquid within a specified measuring range by means of radar signals transmitted to the liquid surface and radar signals reflected from the liquid surface, comprising the steps of i) transmitting radar signals to the liquid surface in time sequence; ii) receiving radar signals reflected from the liquid surface in time sequence; iii) determining the level L partially on the basis the transmitted radar signals and the reflected radar signals. The invention further relates to a device for determining the level L of a liquid within a specified measuring range, at least comprising a radar antenna disposed above the liquid for transmitting radar signals to the liquid and receiving radar signals reflected from the liquid surface, as well as means for determining the liquid level L on the basis of the transmitted radar signals and the reflected radar signals.
95 Citations
21 Claims
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1. A method for determining a level of a liquid within a specified measuring range, comprising the steps of:
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transmitting radar signals to a surface of the liquid in time sequence; receiving radar signals reflected from the liquid surface in time sequence; and determining the liquid level based on the transmitted radar signals and the reflected radar signals by; simultaneously carrying out two different calculation methods, wherein a first of the calculation methods generates a first measured value of the liquid level with a first error and a second of the calculation methods generates a second measured value of the liquid level with a second error, wherein the first calculation method is more sensitive to systematic deviations than the second calculation method, and wherein the second calculation method is more sensitive to strong fluctuations in the liquid level than the first calculation method; analyzing fluctuations in the liquid level in time sequence; and using one of the first and second measured values as the determined liquid level based on the fluctuations in the liquid level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for determining a level of a liquid within a specified measuring range, comprising:
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at least one radar antenna configured to transmit radar signals to the liquid and to receive radar signals reflected from a surface of the liquid; and a measuring device configured to determine the liquid level based on the transmitted radar signals and the reflected radar signals by; simultaneously performing a first calculation method for generating a first measured value of the liquid level with a first error and a second calculation method for generating a second measured value of the liquid level with a second error; analyzing fluctuations in the liquid level in time sequence; and using one of the first and second measured values as the determined liquid level based on the determined fluctuations in the liquid level. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method for determining a measured level of a liquid, comprising the steps of:
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transmitting radar signals toward a surface of the liquid; receiving radar signals reflected from the surface of the liquid; analyzing fluctuations in a liquid level; selecting one of multiple calculation methods based on the fluctuations; and using a measured value obtained by the selected calculation method as the measured level of the liquid; wherein a first of the calculation methods generates a first measured value with a first error and a second of the calculation methods generates a second measured value with a second error; and wherein the first calculation method is more sensitive to systematic deviations than the second calculation method, and the second calculation method is more sensitive to the fluctuations in the liquid level than the first calculation method.
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Specification