Vibrating Sensor Channel Sequencing to Reduce Coupling Drift
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Solution Overview
Problem
Vibrating gyros experience significant drift and setting angle errors due to coupling between excitation and detection stages, particularly exacerbated in humid environments, which existing technologies struggle to mitigate effectively without compromising dynamic range or introducing additional relaxation times.
Innovation Solution
Reversing the sequence of excitation and detection stages on each connection channel to maximize separation between stages, making couplings symmetrical and reducing interference, with each excitation stage preceded by a detection stage to align interference direction with the command, thereby minimizing channel-specific and inter-channel couplings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the control circuit performs excitation stage on the first connection channel, then excitation stage on the second connection channel, then detection stage on the first connection channel, then detection stage on the second connection channel, then the same excitation electronics and detection electronics can be reused for both channels, but coupling appears between successive stages causing gyro drift and setting angle error
Solution Approach 1:
The patent inverts the conventional sequencing by performing detection stages immediately after excitation stages on the same channel, rather than batching all excitations before all detections. This reversal maximizes temporal separation between detection and excitation operations on different channels, reducing coupling effects and memory interference in the digital-to-analog converters while maintaining electronic resource efficiency
2Reliability
If additional relaxation times are introduced to limit coupling defects, then coupling-induced drift is reduced, but the control cycle duration increases
Solution Approach 1:
The patent implements a periodic action pattern where detection and excitation stages are alternated in a regular sequence across the two channels. By systematically cycling through detection-excitation pairs on each channel in alternating fashion, the system naturally introduces relaxation periods without requiring additional dedicated relaxation time, thereby reducing coupling defects while maintaining efficient control cycle timing
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 effectively reduces coupling-induced drift and bias, enhancing the stability and accuracy of the sensor performance without altering the control circuit, particularly beneficial in humid conditions.
Implementation Method 1
a resonator (2) secured to the base (1), the base (1) and the resonator (2) being associated with electrodes (3, 4)
Implementation Method 2
the electrodes (3, 4) being connected to a control circuit (5) via at least a first connection channel (6.1) and a second connection channel (6.2)
Data Source
AI summary
A vibrating sensor having a base and an axisymmetrical resonator secured to the base. The base and the resonator are associated with electrodes connected to a control circuit via at least a first connection channel and a second connection channel with the electrodes being connected to one or other of the channels. The control circuit has excitation electronics and detection electronics and is arranged to control an excitation stage and a detection stage on each of the connection channels. The excitation stages and the detection stages have substantially identical respective durations, wherein the control circuit is arranged to perform the following sequence: excitation stage on the second connection channel; detection stage on the first connection channel; excitation stage on the first connection channel; detection stage on the second connection channel.