Ultrasonic Vibrator Abnormality Detection via Resonance Sharpness
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Solution Overview
Problem
Existing methods for detecting abnormalities in ultrasonic vibrators have a narrow settable range for impedance thresholds, leading to limitations in reducing erroneous detection.
Innovation Solution
A method involving calculating the frequency characteristic of admittance, determining the resonance frequency and frequency width, and calculating sharpness (Q') to accurately detect abnormalities in ultrasonic vibrators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If impedance threshold is used for abnormality detection, then detection method is simple, but detection accuracy is limited and erroneous detection occurs
Solution Approach 1:
The invention changes the detection parameter from simple impedance value to sharpness (Q value) which is calculated from the frequency characteristics of admittance. This parameter transformation allows for more accurate abnormality detection by capturing the resonance characteristics of the ultrasonic vibrator, thereby resolving the contradiction between simple detection method and accurate detection results
Solution Approach 2:
The invention replaces the electrical impedance measurement approach with an analysis of frequency characteristics and resonance behavior. By substituting the direct electrical parameter measurement with a frequency-domain analysis method, the system achieves higher detection accuracy while maintaining operational simplicity through automated calculation
2Loss of time
If impedance minimum value is used for detection, then detection process is quick, but threshold settable range is narrow
Solution Approach 1:
The invention introduces dynamic frequency sweeping to measure the frequency characteristics of admittance across a range of frequencies. This dynamic approach allows the detection system to adapt to different ultrasonic vibrator conditions by identifying resonance peaks and calculating sharpness, providing a much wider and more flexible detection range compared to static impedance measurement
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 allows for precise detection of abnormalities in ultrasonic vibrators, reducing erroneous detection and enabling accurate assessment of abnormality severity.
Implementation Method 1
an impedance measurement circuit 209 that measures a frequency characteristic of impedance of the ultrasonic vibrator 201
Implementation Method 2
a resonance frequency at which the admittance is a maximum value and a frequency width at which a value at a predetermined ratio to the maximum value is obtained
Data Source
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AI summary
An object of the invention is to accurately detect abnormality of an ultrasonic vibrator and reduce erroneous detection. A method for detecting an abnormality of an ultrasonic vibrator of the invention includes: a first step of calculating a frequency characteristic of admittance of the ultrasonic vibrator; a second step of calculating, based on the frequency characteristic of the admittance obtained in the first step, a resonance frequency at which the admittance is a maximum value and a frequency width at which a value at a predetermined ratio to the maximum value is obtained; a third step of calculating sharpness based on the resonance frequency and the frequency width obtained in the second step; and a fourth step of determining an abnormality of the ultrasonic vibrator based on the sharpness calculated in the third step.