Cantilever Electrode Capacitance Detection for Elastic Waves
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Solution Overview
Problem
Existing detecting devices face challenges in precisely detecting elastic waves due to air-induced attenuation between electrodes, leading to incomplete vibration detection.
Innovation Solution
A detecting device with a cantilever structure first electrode and a second electrode positioned closer to the fixed end, reducing air-induced attenuation by optimizing electrode placement and configuration for enhanced capacitance-based detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the second electrode extends to the position opposed to the free end of the first electrode, then the capacitance detection coverage is improved, but the air-induced attenuation of vibration increases
Solution Approach 1:
The patent extracts the second electrode from the region opposite the free end of the first electrode. By removing the electrode portion that would cause excessive air attenuation, the vibration amplitude is preserved while maintaining sufficient capacitance detection capability through the remaining electrode configuration.
Solution Approach 2:
The patent applies local quality by creating non-uniform electrode distribution - the second electrode is positioned closer to the fixed end rather than extending to the free end region. This localized positioning optimizes the balance between detection capability and vibration preservation in different spatial zones.
2Measurement precision
If the second electrode is positioned closer to the free end, then the vibration detection sensitivity is improved, but the air-induced attenuation increases
Solution Approach 1:
The patent converts the harmful air attenuation effect into a beneficial design criterion by deliberately positioning the second electrode away from the free end region. This design choice uses the air attenuation characteristic to define the optimal electrode placement, transforming a negative physical effect into a guiding principle for device configuration.
3Area of stationary object
If the electrode length is increased to improve detection coverage, then the detection area is expanded, but the vibration amplitude decreases due to air attenuation
Solution Approach 1:
The patent applies partial action by providing the second electrode with a length that is sufficient for effective capacitance detection but deliberately shorter than the full extent that would maximize detection area. This partial electrode configuration achieves the necessary detection coverage without excessive length that would cause harmful air attenuation and vibration amplitude reduction.
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
The device achieves precise detection of elastic waves by minimizing air-induced attenuation, allowing for accurate vibration measurement and target identification using the photoacoustic effect.
Implementation Method 1
a first electrode that is a plate having a cantilever structure with a fixed end FX and a free end FR and that vibrates by being bent by an elastic wave
Implementation Method 2
the detecting device detects the elastic wave on the basis of a change in capacitance between the first electrode and the second electrode
Implementation Method 3
accurate vibration measurement and target identification using the photoacoustic effect
Data Source
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AI summary
A detecting device 100 detects an elastic wave propagating through the air. The detecting device100 includes: a first electrode 12 that is a plate having a cantilever structure with a fixed end FX and a free end FR and that vibrates by being bent by the elastic wave; and a second electrode 32 that is a plate, that is opposed to the first electrode, and that has a predetermined distance from the first electrode. The detecting device 100 detects the elastic wave on the basis of a change in capacitance between the first electrode 12 and the second electrode 32. An end of the second electrode 32 in a direction from the fixed end FX to the free end FR is closer to the fixed end than the free end.