Adaptive Drift Correction in Electronic Force-Measuring Devices
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Solution Overview
Problem
Despite improvements in precision, electronic force-measuring devices like balances still experience undesirable drift phenomena due to extraneous influence factors and component behavior, which cannot be fully corrected by existing regulation techniques.
Innovation Solution
A method for adaptive correction of drift phenomena in electronic force-measuring devices, involving a processor-based digital signal-processing unit that uses stored drift parameters to calculate and apply time-dependent correction values, optimizing drift parameters based on current and historical measurement data to compensate for drift errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing regulation techniques are used to correct drift phenomena, then some measurement deviations can be compensated, but drift errors caused by creep and other time-dependent effects cannot be fully corrected
Solution Approach 1:
The patent transforms the static drift correction approach into a dynamic one by continuously updating drift parameters based on historical measurement data. The system adapts to changing drift characteristics over time, making the correction mechanism responsive to temporal variations in creep and other drift phenomena, thereby fully correcting time-dependent drift errors.
Solution Approach 2:
The patent implements a feedback mechanism where measurement data is continuously collected, analyzed, and used to update drift parameters. This closed-loop system compares actual measurements with expected values, identifies drift deviations, and automatically adjusts correction parameters to compensate for drift errors, enabling complete correction of creep-related drift.
2Measurement precision
If drift parameters are updated frequently to improve correction accuracy, then measurement accuracy improves, but device complexity and processing requirements increase
Solution Approach 1:
The patent applies partial action by selectively updating drift parameters based on the actual need for correction. Rather than continuously recalculating all parameters, the system updates parameters only when drift deviations exceed certain thresholds or when specific conditions are met, maintaining high correction accuracy while minimizing unnecessary processing complexity.
Solution Approach 2:
The patent dynamically changes drift parameters based on measured drift characteristics. By adjusting parameters such as drift coefficients and time constants according to actual drift behavior observed in measurements, the system optimizes correction accuracy without requiring complex fixed-parameter structures, adapting the correction model to match actual drift patterns.
Data Source
AI summary
A method serves to correct drift phenomena, in particular creep effects, occurring in an electronic balance that has a measuring transducer through which a measuring signal is formed which is representative of a load applied to the force-measuring device. The measuring signal is delivered by way of an analog/digital converter to a signal-processing unit that is supported by at least one processor, said signal-processing unit being capable of compensating drift deviations, for which purpose the signal-processing unit, via the processor, accesses drift parameters that are stored in a memory unit and serve as basis for calculating a time-dependent correction value by which the drift error of the measuring signal (ms) is corrected. At time intervals that are either controlled automatically or chosen by the user, new optimized values for the drift parameters are determined automatically by the processor and the signal-processing unit under the control of an optimization program that is stored in the memory unit, and the new optimized values are filed in the memory unit.