Radiometric Mass Flow Correction via Belt Attenuation Segmentation
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Solution Overview
Problem
Radiometric measuring devices for determining mass flow on conveyor belts require frequent and time-consuming recalibration due to changes in conveyor belt geometry, leading to inaccurate mass flow determination and increased operational costs.
Innovation Solution
A radiometric measuring device that uses a single calibration measurement without bulk material to calculate a correction equation, allowing the measured value equation from initial commissioning to be retained, and applies this correction to detected radiation for accurate mass flow determination, eliminating the need for full recalibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full recalibration is performed to maintain measurement precision after conveyor belt changes, then measurement precision is improved, but loss of time and productivity deteriorate due to time-consuming calibration process
Solution Approach 1:
The calibration process is segmented into two distinct parts: (1) initial comprehensive calibration to establish the measured value equation mapping radiation attenuation to mass flow, and (2) subsequent simplified belt parameter calibration that only measures belt-specific attenuation characteristics. This segmentation allows the time-consuming initial calibration to be performed once, while subsequent calibrations focus only on the variable belt parameters, dramatically reducing recalibration time while maintaining measurement precision.
Solution Approach 2:
The system performs preliminary calibration measurements to determine belt-specific attenuation characteristics and stores these as correction factors in the storage means. When the conveyor belt is changed, the system automatically retrieves the pre-stored belt correction factors and applies them to the measured value equation, eliminating the need for time-consuming full recalibration and ensuring measurement precision is maintained through advance preparation of calibration data.
2Measurement precision
If frequent recalibration is performed to maintain measurement precision after conveyor belt changes, then measurement precision is improved, but productivity deteriorates due to operational interruptions
Solution Approach 1:
The calibration process is segmented into initial comprehensive calibration and subsequent simplified belt parameter calibration. This segmentation enables rapid recalibration that does not require operational interruptions, as the belt-specific correction factors can be determined and applied quickly, thereby maintaining measurement precision while preserving plant productivity.
Solution Approach 2:
The system automatically performs belt parameter calibration and applies correction factors without requiring manual intervention or operational shutdowns. The evaluation unit automatically processes the measured value equation with the stored belt correction factors, enabling the system to self-adjust to conveyor belt changes while maintaining continuous operation and high productivity.
3Measurement precision
If comprehensive calibration mapping all operating conditions is performed, then measurement precision is improved, but device complexity increases due to multiple calibration measurements
Solution Approach 1:
The calibration approach is segmented into: (1) initial calibration to establish the fundamental measured value equation, and (2) subsequent simplified belt parameter calibration that only measures belt-specific attenuation. This segmentation reduces device complexity by eliminating the need for complex multi-condition calibration procedures while maintaining measurement precision across different operating conditions through the use of stored belt correction factors.
Solution Approach 2:
The system changes the calibration parameter from comprehensive multi-condition calibration to focused belt-specific attenuation measurement. By measuring only the belt-specific attenuation parameter and storing it as a correction factor, the system simplifies the calibration process while maintaining the ability to accurately determine mass flow across different operating conditions through application of the correction equation.
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 reduces the cost and time of maintenance while maintaining high-quality mass flow determination over the device's lifetime, ensuring accurate measurements without the need for repeated calibration measurements.
Implementation Method 1
at least one detector unit, which is configured to detect at least part of the radiation that has at least partially traversed the bulk material and the conveyor belt
Data Source
AI summary
A radiometric measuring device for determining a mass flow of a bulk material on a conveyor belt including, at least one detector which is configured to detect at least part of radiation of at least one radiation source the emits the radiation in a direction of the bulk material on the conveyor belt, the radiation having at least partially passed through the bulk material and the conveyor belt, at least one evaluation circuit which is configured to determine the mass flow of the bulk material based on the detected radiation; at least one storage means which is set up to store at least one measured value equation, the measured value equation mapping a relationship between the detected radiation and the mass flow, at least one electronic calculation means which is set up to determine, based on at least one calibration measurement without bulk material on the conveyor belt, a correction equation with which the measured value equation is corrected.