Radar Level Gauge Probe with Reference Reflectors
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Solution Overview
Problem
Radar level gauge systems fail to accurately measure filling levels due to factors other than vapor concentration, such as probe contamination and uneven vapor distribution, which are not accounted for in existing systems.
Innovation Solution
The use of irregularly spaced reference reflectors along the probe, with at least one positioned within the range of fluctuating filling levels, allows for compensation of propagation velocity changes caused by contamination and vapor distribution, enabling more accurate distance measurements to the product surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional radar level gauge systems are used without compensation for environmental factors, then the system structure remains simple, but measurement precision deteriorates due to unaccounted propagation velocity changes from vapor concentration, probe contamination, and uneven vapor distribution
Solution Approach 1:
The probe is segmented with multiple reference reflectors positioned at known locations along its length. These reflectors divide the measurement path into segments, allowing the system to measure propagation velocity at different positions and compensate for local variations caused by contamination and vapor distribution, thereby improving measurement precision without requiring complete system redesign
Solution Approach 2:
Reference reflectors are introduced as intermediary elements between the transmitter and the product surface. These reflectors provide known reference points that enable the system to calculate compensation factors for propagation velocity variations. The reflectors act as mediators that allow the system to indirectly measure and compensate for environmental effects without directly measuring them
2Difficulty of detecting and measuring
If reference reflectors are regularly spaced along the probe, then the system structure remains simple and uniform, but the ability to detect and measure propagation velocity variations in different environmental zones is insufficient
Solution Approach 1:
Reference reflectors are positioned asymmetrically (irregularly spaced) along the probe rather than at uniform intervals. This asymmetric positioning places reflectors at strategic locations where propagation velocity variations are most likely to occur, such as near the expected product surface level and in zones with different vapor concentrations or contamination risks, thereby enhancing detection capability while maintaining manageable positioning complexity
3Measurement precision
If only vapor concentration compensation is implemented, then the compensation system remains simple, but measurement precision deteriorates when other factors like probe contamination and uneven vapor distribution dominate the propagation velocity changes
Solution Approach 1:
The reference reflector-based compensation system is designed to be universal and adaptable to multiple environmental factors simultaneously. By measuring propagation velocity at multiple known positions along the probe, the system can compensate for vapor concentration, probe contamination, and uneven vapor distribution effects in a unified manner. The same hardware infrastructure supports compensation for various factors without requiring separate dedicated systems for each, thereby improving measurement precision across diverse operating conditions while maintaining reasonable adaptability
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 improves the accuracy of filling level measurements by accounting for probe contamination and vapor distribution, reducing measurement errors and providing more reliable results in varying environmental conditions.
Implementation Method 1
electromagnetic signals are radiated towards the product contained in the tank
Implementation Method 2
The electromagnetic signals are subsequently reflected at the surface of the product
Implementation Method 3
the distance to the surface of the product can be determined based on the time between transmission of an electromagnetic signal and receipt of the reflection thereof
Data Source
Figure 1a~1b
Figure 1c
Figure 2a~3c
AI summary
A method for determining a filling level of a product contained in a tank, by means of a radar level gauge system comprising a transceiver for generating, transmitting and receiving electromagnetic signals; a probe connected to the transceiver and arranged to guide a transmitted electromagnetic signal from the transceiver towards and into the product inside the tank, and to return a reflected electromagnetic signal resulting from reflection of the transmitted electromagnetic signal by a surface of the product back towards the transceiver; and a plurality of reference reflectors each being arranged at a respective known position along the probe and being configured to reflect a portion of the transmitted electromagnetic signal back towards the transceiver. The method comprises the steps of identifying, based on received electromagnetic signals reflected by the reference reflectors, a set of reference reflectors located above the surface of the product; selecting first and second reference reflectors comprised in the set of reference reflectors; determining a propagation velocity compensation factor based on a known distance between the first and second reference reflectors and a distance therebetween determined using received electromagnetic signals reflected by the first and second reference reflector, respectively; and determining the filling level based on a received electromagnetic signal reflected by the surface of the product, and the propagation velocity compensation factor.