Vibratory Inertial Force Sensor Signal Processing
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Solution Overview
Problem
Conventional vibratory inertial force sensors face reduced performance due to waveform errors and offset issues during signal processing, particularly with saw-tooth waveforms, which affect detection accuracy.
Innovation Solution
The method involves using a passive filter to remove harmonic components from the detection signal before smoothing, employing a structure with resistors and capacitors to suppress harmonic components and improve tracking ability, thereby eliminating waveform errors and offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synchronous wave detection is used to detect the signal, then the detection sensitivity is improved, but waveform errors and offsets occur due to amplification lag at switchover sections
Solution Approach 1:
The patent applies preliminary action by performing smoothing processing on the detection signal before amplification. The smoothing circuit processes the saw-tooth waveform from synchronous wave detection in advance, preparing it for subsequent amplification without causing waveform errors or offsets from amplification lag.
Solution Approach 2:
The patent introduces a smoothing circuit as an intermediary between the synchronous wave detector and the amplifier. This intermediary component transforms the problematic saw-tooth waveform into a smoothed waveform, eliminating the switchover sections that cause amplification lag and waveform errors.
2Power
If amplification is performed before smoothing, then the signal strength is increased, but waveform errors cause offset in the output signal
Solution Approach 1:
The patent reverses the conventional order by performing smoothing before amplification. The smoothing circuit processes the detection signal in advance to eliminate waveform errors, ensuring that subsequent amplification does not introduce offsets, thereby maintaining output accuracy while increasing signal strength.
3Manufacturing precision
If a low-pass filter with large time constant is used to smooth the signal, then the smoothing effect is improved, but the response speed decreases
Solution Approach 1:
The patent changes the approach to smoothing by using a smoothing circuit that processes the waveform shape directly rather than relying on a low-pass filter with large time constant. This allows effective smoothing of the saw-tooth waveform while maintaining faster response speed, as the smoothing is achieved through waveform transformation rather than temporal filtering.
Data Source
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AI summary
A method for processing a detection signal of a vibratory inertial force sensor is disclosed. This method improves detection accuracy of the vibratory inertial force sensor. A detection circuit of the vibratory inertial force sensor removes harmonic component from signals synchronously wave-detected, and amplifies the resultant signals, and then smoothes the amplified signals. A vibratory inertial force sensor adopting this method is also disclosed.