Piezoelectric Torque Sensor Drift Correction via Dual-Sensor Feedback
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Solution Overview
Problem
Piezoelectric torque sensors struggle to accurately measure low-frequency torque oscillations due to signal drift, limiting their effectiveness in static force measurements and expanding their measurement spectrum.
Innovation Solution
A method that combines a piezoelectric torque sensor with a second torque sensor using a different measuring principle to continuously detect static torques, allowing for adjustment of the measurement signal to correct for drift and enable accurate measurements across a broader frequency range, including low-frequency oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a piezoelectric torque sensor is used to measure dynamic torques, then measurement precision for high-frequency oscillations is improved, but measurement reliability for low-frequency and static torques deteriorates due to signal drift
Solution Approach 1:
The patent combines a piezoelectric torque sensor (for high-frequency dynamic measurements) with a second torque sensor based on a different measuring principle (for low-frequency and static measurements) into a single measuring apparatus. This merging allows the system to leverage the strengths of both sensor types: the piezoelectric sensor excels at capturing rapid torque oscillations, while the second sensor provides stable, drift-free measurements for static and low-frequency components. The combined system thus achieves both high measurement precision for dynamic torques and high reliability for static torques.
Solution Approach 2:
The second torque sensor acts as an intermediary that compensates for the piezoelectric sensor's weakness in measuring static and low-frequency torques. By providing a reference measurement that is not subject to signal drift, the second sensor enables the system to correct and adjust the piezoelectric sensor's output, thereby extending the reliable measurement range into low-frequency and static territories while maintaining the high-frequency measurement capabilities of the piezoelectric element.
2Adaptability or versatility
If a piezoelectric torque sensor is used for measuring static torques, then measurement capability is expanded, but measurement accuracy deteriorates due to time drift in the measuring signal
Solution Approach 1:
The patent implements a feedback mechanism where the second torque sensor continuously monitors the torque and provides a reference signal that is used to adjust and correct the measurement signal from the piezoelectric torque sensor. This feedback loop compensates for the time drift inherent in piezoelectric measurements, allowing the system to maintain high measurement accuracy for static and low-frequency torques while preserving the expanded measurement capability across the full frequency spectrum.
Solution Approach 2:
The system dynamically adjusts measurement parameters by switching between or combining the output signals of the two torque sensors based on the frequency characteristics of the torque being measured. For high-frequency dynamic torques, the piezoelectric sensor's output is prioritized, while for low-frequency and static torques, the second sensor's drift-free measurements are used, thereby maintaining high accuracy across all operating conditions while preserving versatile measurement capability.
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 combination enables precise measurement of dynamic and static torques, expanding the measurement spectrum of piezoelectric torque sensors into the low-frequency range and allowing for accurate detection of torques at frequencies below 1 Hz, thereby improving measurement accuracy and reliability.
Implementation Method 1
Piezoelectric torque sensors have piezoelements which, upon a force being applied, generate a voltage based on the piezoelectric effect
Data Source
AI summary
The invention relates to a method for adjusting a piezoelectric torque sensor of a measuring apparatus, which can be part of a test bench, for determining a torque applied to a test piece due to a force flux, wherein the measuring apparatus comprises a piezoelectric torque sensor and a second torque sensor based on a different measuring principle which is designed to continuously detect static torques, wherein the measuring apparatus is configured such that both torque sensors measure torques in the force flux, whereby a target measurement signal of the piezoelectric torque sensor is determined on the basis of a torque measurement by the second torque sensor, and whereby the detected measurement signal of the piezoelectric torque sensor is adjusted and output on the basis of the determined target measurement signal.