Common Sense Electrode Feedback to Reduce Sensor Spring Softening
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Solution Overview
Problem
Conventional sensor systems are susceptible to 'spring softening' effects due to mutual charges caused by common motions applied to sensors not rigidly coupled to other sensors, leading to inaccurate readings and performance degradation.
Innovation Solution
The implementation of a voltage-to-voltage (V2V) converter that applies a positive feedback voltage to a common sense electrode, maintaining a constant charge and minimizing common charge flow through defined feedback capacitance, effectively eliminating electrostatic spring softening effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sensors are not rigidly coupled to other sensors, then sensor system flexibility and ease of manufacture are improved, but spring softening effects occur due to mutual charges from common motion
Solution Approach 1:
The patent implements a feedback mechanism where the charge flow from common motion is detected and fed back through a defined feedback capacitance to generate a compensating voltage. This feedback voltage is applied to the common sense electrode to counteract the mutual charge effects, thereby eliminating spring softening while maintaining the flexible non-rigid coupling configuration.
Solution Approach 2:
The patent changes the electrical parameters by introducing a defined feedback capacitance value and operating voltage that specifically counteract the spring softening effect. By adjusting these electrical parameters, the system compensates for the mechanical flexibility, maintaining measurement accuracy without requiring rigid mechanical coupling.
2Device complexity
If conventional sensor systems are used with common motion susceptibility, then device complexity is reduced, but measurement precision deteriorates due to spring softening
Solution Approach 1:
The patent introduces an intermediary feedback capacitance element that mediates between the common motion-induced charge flow and the sense electrode. This intermediary component transforms the harmful mutual charge into a useful feedback signal that automatically compensates for spring softening, improving measurement precision without significantly increasing overall device complexity.
3Reliability
If positive feedback voltage is applied through V2V converter, then spring softening effects are eliminated, but device complexity increases
Solution Approach 1:
The patent implements a self-service mechanism where the sensor system automatically generates its own compensating voltage through the feedback capacitance. The system uses its own output signal to create the feedback voltage, eliminating the need for external complex control circuits or additional power sources, thereby limiting the increase in device complexity.
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 impact of common motion on sensor outputs, increasing the separation between common and differential motion resonant frequencies and decreasing the magnitude of outputs corresponding to common motion resonant frequencies, thereby enhancing sensor accuracy and stability.
Implementation Method 1
minimizing common charge flow through defined feedback capacitance
Implementation Method 2
the mutual charge changing an electrostatic force corresponding to the sensors
Implementation Method 3
representing a spring softening effect on electromechanical sense elements
Implementation Method 4
proof masses, which can be designed to move differentially in response to a Coriolis force
Data Source
AI summary
Reducing, at a common sense electrode of a group of sensors of a system, a common charge flow due to a common motion of the group of sensors is presented herein. The group of electromechanical sensors generates a common charge flow as a result of a common motion of the group of electromechanical sensors and a differential charge flow as a result of a differential motion of the group of electromechanical sensors—respective sense elements of the group of electromechanical sensors being electrically connected at the common sense electrode. The system further comprises a voltage-to-voltage converter component that generates, via an output of the voltage-to-voltage converter component, a positive feedback voltage, and minimizes the common charge flow by coupling, via a defined feedback capacitance, the positive feedback voltage to the common sense electrode—the common sense electrode being electrically coupled to an input of the voltage-to-voltage converter component.