Fill Level Measuring Device Reference Point Geometry Correction
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Solution Overview
Problem
Existing fill level measuring devices face significant deviations in determining actual filling levels due to changes in atmospheric conditions, particularly temperature, which affect the propagation speed of electromagnetic waves and the geometry of reference points, leading to inaccuracies in transit time measurements.
Innovation Solution
A fill level measuring device with an evaluation unit that accounts for changes in the geometry of reference points due to environmental conditions, using at least two reference points made of materials with different coefficients of expansion, and optionally incorporating a sensor for ambient condition data, allows for correction factors to be calculated and applied to improve measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single reference point is used for transit time measurement correction, then the device complexity is low, but the measurement precision deteriorates due to temperature-induced geometric changes
Solution Approach 1:
The single reference point is segmented into multiple reference points (at least two) with different thermal expansion coefficients. Each reference point provides an independent measurement signal, allowing the system to distinguish between geometric changes and atmospheric effects. This segmentation resolves the contradiction by improving measurement precision through multiple data points while maintaining relatively simple device architecture.
Solution Approach 2:
Reference points are constructed from materials with different thermal expansion coefficients (e.g., metal and ceramic combinations). This composite approach allows the system to detect and compensate for temperature-induced geometric changes by comparing the differential expansion behavior of different materials, thereby improving measurement accuracy without adding complex external compensation mechanisms.
2Measurement precision
If correction factors are applied without accounting for reference point geometry changes, then the ease of operation is high, but the measurement precision deteriorates due to temperature effects
Solution Approach 1:
The system performs self-compensation by using the differential geometric changes of multiple reference points made from different materials to automatically identify and correct for temperature effects. The evaluation unit processes the signals from multiple reference points and applies correction factors without requiring external temperature sensors or manual calibration, maintaining ease of operation while improving precision.
3Measurement precision
If the propagation speed of electromagnetic waves is assumed constant, then the device complexity is low, but the measurement precision deteriorates in varying atmospheric conditions
Solution Approach 1:
The system changes the parameter being measured from absolute transit time to differential transit time between multiple reference points. By focusing on the difference in transit times rather than absolute values, the system automatically compensates for atmospheric condition variations that affect all reference points equally, improving precision without requiring complex atmospheric modeling or additional sensors.
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 device provides improved accuracy in determining fill levels by accounting for temperature-related changes in the geometry of reference points, reducing errors caused by temperature-induced expansion and changes in atmospheric conditions, thereby enhancing the precision of transit time measurements.
Implementation Method 1
the transit time measurement between the transmission of an electromagnetic wave and the reception of a reflection or an echo of the same for determining the filling level
Implementation Method 2
at which part of the electromagnetic wave forming the measurement signal is reflected
Implementation Method 3
causes a significant temperature-related expansion in many materials
Data Source
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AI summary
A level measuring device (101, 101', 101") is provided for measuring the level of a medium (106) in the presence of an atmosphere (105) that influences the transit time of electromagnetic waves, using an electromagnetic wave according to a transit-time principle, with an evaluation unit (102), a transmitting and receiving unit (109) for transmitting and receiving electromagnetic waves, at least one measuring probe (108, 108', 108"), and at least one reference point (104, 501, 502, 601, 602, 603), in which the evaluation unit (102) is configured such that, when processing the transit time of a signal reflected at the reference point (104, 501, 502, 601, 602, 603), it detects a change in the geometry of the reference point (104, 501, 502, 601, 602).603) depending on the environmental conditions and a method for level measurement comprising the steps of emitting an electromagnetic wave through an atmosphere (105) towards a surface (110) of a medium (106) whose level is to be measured, receiving echoes from at least one reference point (104, 501, 502, 601, 602, 603) and recording the transit time of these echoes, receiving an echo from the surface (110) of the medium (106) whose level is to be measured and recording the transit time of this echo, and determining the level by evaluating the recorded transit times of the echoes, taking into account a correction factor to account for the effects of the atmosphere (105) on the transit time of the electromagnetic wave, wherein, in determining the correction factor to be taken into account, the influence of a change in the geometry of the reference point (104, 501, 502, 601, 602,603) depending on the environmental conditions.