Guided Wave Radar Interface Detection for Fluctuating Echoes
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Solution Overview
Problem
Radar level gauges face challenges in accurately measuring the interface between mixed or emulsified substances in tanks due to fluctuating echo amplitudes, making it difficult to maintain stable and precise readings.
Innovation Solution
A guided wave radar level gauge using a sliding window peak detection algorithm to identify the interface by detecting a first peak exceeding a threshold amplitude and applying a sliding window algorithm to detect a second peak, enhancing adaptability and accuracy in fluctuating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a threshold-based peak detection method is used to identify material interface, then the detection is simple and fast, but it fails to detect peaks when echo amplitude fluctuates below the threshold
Solution Approach 1:
The patent implements a dynamic peak detection algorithm that adapts to fluctuating echo amplitudes by continuously adjusting detection parameters based on signal characteristics, rather than using a fixed threshold. This allows reliable detection of material interfaces even when echo strength varies, resolving the contradiction between simple detection and reliable detection.
Solution Approach 2:
The patent changes the detection parameter from a fixed amplitude threshold to a dynamic threshold that adjusts based on signal analysis. This parameter transformation enables the system to maintain detection reliability across varying echo conditions while keeping the detection process computationally efficient.
2Reliability
If a dynamic sliding window peak detection algorithm is applied to handle fluctuating echo amplitudes, then peak detection reliability improves, but computational complexity increases
Solution Approach 1:
The patent divides the received signal into overlapping segments or windows, applying peak detection to each segment independently. This segmentation approach breaks down the complex task of detecting peaks in fluctuating signals into simpler sub-tasks, improving reliability without requiring a single complex algorithm to handle the entire signal at once.
Solution Approach 2:
The patent applies peak detection to multiple overlapping windows, which is more than the minimum single-window approach. This excessive action ensures that at least one window will capture the peak regardless of signal fluctuations, improving detection reliability while maintaining manageable computational complexity through efficient windowing strategies.
3Adaptability or versatility
If traditional peak detection is used in emulsified interfaces, then the system operates with standard algorithms, but measurement precision deteriorates due to indistinct interfaces
Solution Approach 1:
The patent implements feedback mechanisms where the detection algorithm uses information from detected peaks and signal characteristics to adjust subsequent detection parameters. This feedback loop enables the system to maintain high measurement precision for interface location by continuously adapting to the specific conditions of emulsified interfaces, while keeping the overall system operationally versatile.
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
The system provides more accurate and reliable interface detection in complex tank environments by filtering out noise and identifying meaningful peaks, even in scenarios with unclear boundaries between substances.
Implementation Method 1
Radar level gauging is generally performed either by means of non-contact measurement, whereby electromagnetic signals are radiated towards the product contained in the tank, or by means of contact measurement, often referred to as guided wave radar (GWR), whereby electromagnetic signals are guided towards and into the product by a probe acting as a waveguide.
Implementation Method 2
The transmitted electromagnetic signals are reflected at the surface of the product, and the reflected signals are received by a receiver or transceiver comprised in the radar level gauge.
Implementation Method 3
detect a first peak in the received signal, the first peak having a first amplitude exceeding a first threshold amplitude; determine that no second peak having an amplitude exceeding a second threshold amplitude is detected; apply a sliding window peak detection algorithm to the signal to detect a second peak in the signal
Data Source
AI summary
A guided wave radar level gauge for determining a fill level of a product contained in a tank comprising: a measurement unit; a probe; and control circuitry configured to: transmit a signal along the probe; receive a reflected signal; detect a first peak in the received signal, the first peak having a first amplitude exceeding a first threshold amplitude; determine that no second peak having an amplitude exceeding a second threshold amplitude is detected; apply a sliding window peak detection algorithm to the signal to detect a second peak in the signal; and determining a location of a material interface based on the location of the second peak.