Radar Liquid Level Sensor Adaptive Calculation Switching
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Solution Overview
Problem
Existing radar-based liquid level measurement methods are unreliable in the presence of strong or rapid liquid level fluctuations, as they become sensitive to systematic deviations and phase ambiguities, leading to inaccurate measurements.
Innovation Solution
The method employs two calculation methods simultaneously, switching between them based on detected fluctuations, using time difference, frequency difference, or phase difference calculations, with recalibration against a reference method to maintain accuracy by adjusting the degree of inaccuracy in response to surface distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase difference calculation method is used for accurate liquid level measurement, then measurement precision is improved, but reliability deteriorates under strong or rapid liquid level fluctuations due to phase ambiguities and systematic deviations
Solution Approach 1:
The patent changes the measurement parameter dynamically by switching between phase difference calculation (for calm conditions) and time difference calculation (for fluctuating conditions). This allows the system to adapt to varying liquid surface conditions and maintain both precision and reliability across different operating states
Solution Approach 2:
The patent implements a dynamic measurement system that automatically adjusts the calculation method based on detected liquid level fluctuations. The system monitors the stability of phase difference measurements and switches to alternative methods when fluctuations exceed thresholds, making the measurement process adaptive rather than static
2Device complexity
If a single calculation method is used for liquid level determination, then device complexity is reduced, but adaptability deteriorates when facing varying liquid surface conditions
Solution Approach 1:
The patent makes the measurement system multi-functional by incorporating multiple calculation methods (phase difference, time difference, frequency difference) within a single device. The system can universally handle both calm and turbulent liquid surface conditions by selecting the appropriate calculation method, avoiding the need for multiple separate measurement devices
Solution Approach 2:
The system dynamically selects which calculation method to employ based on real-time assessment of liquid surface conditions. This dynamic adaptability allows a single device to function effectively across varying operational environments without requiring physical reconfiguration
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures reliable and accurate liquid level measurements by adapting the measurement method to handle fluctuations, preventing errors and maintaining system accuracy even under turbulent conditions.
Implementation Method 1
transmitting radar signals to the liquid surface in time sequence; receiving radar signals reflected from the liquid surface in time sequence
Implementation Method 2
receiving radar signals reflected from the liquid surface
Data Source
AI summary
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.