Radar Level Sensor Antenna Array for Bulk Material Surface Topology
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Solution Overview
Problem
Radar level measuring methods face challenges in determining the fill level of bulk materials with conical surfaces and interference from container devices, as the retroreflected signal does not provide a direct measure due to complex surface geometry and potential reflections from agitators or stirrers.
Innovation Solution
Transmitting the measuring signal into multiple regions and receiving the retroreflected portions at multiple points to gather amplitude and phase data, which are used in a geometric-mathematical model to approximate the surface contour and determine parameters like height and slope, allowing for a three-dimensional surface topology assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single transmitting antenna and single receiving antenna are used for radar level measurement, then the device complexity is low, but the measurement precision deteriorates when measuring bulk materials with conical surfaces or when interference from container devices occurs
Solution Approach 1:
The patent divides the single antenna system into multiple transmitting antennas and multiple receiving antennas. Each antenna pair measures a specific region, and the results are combined to achieve accurate level measurement across the entire container, resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent transitions from a single-point measurement approach to a multi-dimensional spatial measurement approach by distributing multiple antennas across different positions and orientations, enabling comprehensive coverage of conical surfaces and elimination of blind spots
2Object-affected harmful factors
If the measuring signal is transmitted in a narrow spatial direction to avoid interference from container devices, then the harmful factors from container devices are reduced, but the area of detection is limited
Solution Approach 1:
The detection area is segmented into multiple zones, each covered by a specific transmitting antenna. By assigning different spatial directions to different antenna pairs, the system achieves both narrow beamwidth for interference avoidance and comprehensive area coverage through the collective action of multiple antennas
Solution Approach 2:
Multiple transmitting antennas and multiple receiving antennas are configured to perform multiple functions simultaneously: each antenna pair provides narrow-beam measurement for its specific region while the entire array collectively covers the full detection area, eliminating blind spots and interfering reflections
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 enables reliable level determination even under complex conditions, providing accurate information on the size, shape, and structure of the bulk material surface, and calculating its volume for quantity assessment.
Implementation Method 1
measuring by employing the radar principle, whereby a measuring signal is generated and sent in the direction of the medium, a retroreflected part of the measuring signal is captured
Implementation Method 2
a retroreflected part of the measuring signal is captured
Implementation Method 3
a geometric-mathematical model to approximate the surface contour and determine parameters like height and slope
Data Source
AI summary
A method for measuring the fill level of a medium in a container by applying the radar principle, whereby a measuring signal is generated and transmitted in the direction of the medium. A retroreflected portion of the measuring signal is captured and the fill level is determined as a function of the runtime of the measuring signal. The measuring signal is transmitted into multiple mutually different regions and the retroreflected portions of the measuring signal is received at multiple receiving points. In this fashion, it is possible to at least approximate the surface structure of the medium in the container.