Vibration Rectification Error Correction via Asynchronous Filter Synchronization
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Solution Overview
Problem
Existing sensor modules face challenges in accurately correcting vibration rectification errors, particularly due to nonlinearity and cantilever resonance, which require large circuit synchronizations and heavy post-processing loads.
Innovation Solution
A vibration rectification error correction device and method that utilize a frequency delta-sigma modulation circuit to generate a modulation signal, followed by first and second filter processing stages that operate in sync with the measurement target signal and an asynchronous frequency signal, respectively, to adjust and cancel out vibration rectification errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a second low-pass filter operates in sync with the reference clock, then vibration rectification errors can be corrected, but obtaining data in sync with asynchronous signals requires large synchronization circuits or heavy post-processing
Solution Approach 1:
The patent applies dynamics by making the second low-pass filter's operation mode flexible - it can operate either in sync with the reference clock or in sync with an asynchronous first frequency signal depending on the measurement requirements. This dynamic adaptability allows the system to achieve vibration rectification error correction without always requiring large synchronization circuits.
Solution Approach 2:
The patent changes the synchronization parameter of the second low-pass filter from fixed (always sync with reference clock) to variable (can switch between reference clock sync and asynchronous signal sync). This parameter change enables the system to reduce circuit complexity by selecting appropriate synchronization modes based on measurement needs.
2Measurement precision
If the second low-pass filter operates in sync with the reference clock, then vibration rectification errors can be corrected, but post-processing becomes heavy in load
Solution Approach 1:
The patent performs preliminary synchronization adjustment by allowing the second low-pass filter to operate in sync with the first frequency signal from the beginning of the measurement process. This preliminary action ensures that data is already synchronized with asynchronous signals when acquired, eliminating the need for heavy post-processing synchronization operations.
3Ease of manufacture
If filters operate with fixed synchronization, then circuit design is simplified, but adaptability to different signal frequencies is reduced
Solution Approach 1:
The patent implements universality by designing the second low-pass filter to perform multiple functions - it can operate in sync with the reference clock for standard measurements and in sync with asynchronous first frequency signals for specialized measurements. This multi-functionality maintains circuit design simplicity while significantly improving adaptability to different signal frequencies and measurement requirements.
Data Source
AI summary
A vibration rectification error correction device includes a reference signal generation circuit configured to output a reference signal, a frequency delta-sigma modulation circuit configured to perform a frequency delta-sigma modulation on the reference signal using a measurement target signal to generate a frequency delta-sigma modulation signal, a first filter which is disposed in a posterior stage of the frequency delta-sigma modulation circuit, and operates in sync with the measurement target signal, and a second filter which is disposed in a posterior stage of the first filter, and operates in sync with a first frequency signal asynchronous with the reference signal.