Multi-Axis Vibration Gyro Sensor Frequency Tuning
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Solution Overview
Problem
Existing sensor devices that detect angular velocities around multiple axes suffer from significant differences in noise levels between sensor outputs, leading to varying accuracy depending on the detection axis, particularly in vibration gyro sensors where the difference in operation frequencies between sensor elements results in crosstalk and reduced detection accuracy.
Innovation Solution
A sensor device configuration where the drive frequencies of sensor elements are set to satisfy specific relationships (e.g., fd1 > fd2 and fm1 < fm2) to minimize noise level differences and crosstalk, with each sensor element having adjustable drive, detection, and mistuned frequencies, allowing for accurate detection of angular velocities around intersecting axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the difference between operation frequencies of two vibration elements is set to 1 kHz or more, then the crosstalk of drive signals or detection signals between vibration elements is reduced and detection accuracy is raised, but the difference between noise levels of sensor output becomes large
Solution Approach 1:
The patent applies parameter changes by carefully selecting and adjusting the drive frequencies of multiple vibration elements. Specifically, it sets the drive frequency difference to 1 kHz or more to reduce crosstalk, while simultaneously controlling the mistuned frequency difference to 0.5 kHz or less to minimize noise level differences. This dual parameter optimization resolves the contradiction between detection accuracy and noise consistency.
Solution Approach 2:
The patent introduces dynamic frequency adjustment capabilities through mistuned frequency control. By allowing flexible adjustment of mistuned frequencies while maintaining the drive frequency difference requirement, the system can adaptively optimize performance for different detection scenarios, balancing crosstalk reduction with noise level uniformity across multiple sensor elements.
2Object-generated harmful factors
If multiple sensor elements are driven at different drive frequencies, then crosstalk is reduced, but the noise levels of sensor outputs become significantly different
Solution Approach 1:
The patent resolves this contradiction through precise parameter control of frequency characteristics. It establishes that the drive frequency difference should be 1 kHz or more to minimize crosstalk, while the mistuned frequency difference should be 0.5 kHz or less to maintain consistent noise levels. This coordinated parameter management allows the system to achieve both low crosstalk and uniform noise characteristics across multiple sensor elements.
Solution Approach 2:
The patent implements feedback mechanisms by monitoring and adjusting frequency parameters based on detected performance characteristics. Through feedback control of drive and mistuned frequencies, the system can maintain optimal operating conditions that balance crosstalk reduction with noise level consistency, ensuring reliable multi-axis detection performance.
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 configuration enables the sensor device to detect angular velocities with reduced noise level differences and crosstalk, resulting in improved accuracy and reliability across multiple axes, enhancing the performance of electronic apparatuses that utilize these sensors.
Implementation Method 1
a sensor element which detects an angular velocity around a detection axis
Data Source
AI summary
A sensor device includes a first sensor element which detects an angular velocity around z axis and a second sensor element which detects an angular velocity around x axis, the relationship fd1>fd2 and fm1<fm2 is satisfied, when the drive frequency of the first sensor element is set to fd1, the drive frequency of the second sensor element is set to fd2, the mistuned frequency of the first sensor element is set to fm1, and the mistuned frequency of the second sensor element is set to fm2.