Electron Surface Tunneling Microphone Vibration Isolation
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Solution Overview
Problem
Existing electron surface tunneling microphones face high fabrication costs and significant vibration sensitivity due to complex MEMS structures, which also limit their acoustic bandwidth and control precision.
Innovation Solution
An electron surface tunneling microphone with a tunneling tip integrated on a single support substrate, featuring a rigid perforated suspension plate and control electrodes to reduce vibration sensitivity and noise, allowing for precise control of the membrane's proximity to the tip using electrostatic attraction and a feedback loop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex MEMS structures are used to achieve electron surface tunneling, then detection sensitivity is improved, but fabrication cost and device complexity increase
Solution Approach 1:
The patent combines the tunneling tip and pressure-sensitive membrane into a single integrated structure fabricated on one substrate. The tunneling tip is formed as part of the membrane structure itself, eliminating the need for separate complex MEMS components. This merging reduces fabrication steps and device complexity while maintaining the high detection sensitivity achieved through electron surface tunneling.
Solution Approach 2:
The integrated structure serves multiple functions simultaneously: the membrane acts as both the pressure-sensitive element and the tunneling tip, while the same structure provides both acoustic detection and electrical tunneling pathways. This multi-functionality reduces the number of separate components needed, thereby reducing fabrication cost and complexity.
2Measurement precision
If complex MEMS structures are used to achieve electron surface tunneling, then detection sensitivity is improved, but vibration sensitivity increases
Solution Approach 1:
By merging the tunneling tip with the membrane structure, the patent eliminates the separate cantilever components that are highly sensitive to vibration. The integrated design ensures that only the membrane moves in response to acoustic pressure, while the tunneling tip remains stable, thereby reducing vibration sensitivity while maintaining detection sensitivity.
3Measurement precision
If complex MEMS structures are used to achieve electron surface tunneling, then detection sensitivity is improved, but acoustic bandwidth is limited
Solution Approach 1:
The integrated structure removes the mass and complexity of separate MEMS components, resulting in a lighter, more flexible system that can respond to a wider range of acoustic frequencies. The simplified design reduces mechanical resonance limitations and allows the microphone to detect acoustic signals across a broader bandwidth while maintaining high sensitivity.
4Measurement precision
If complex MEMS structures are used to achieve electron surface tunneling, then detection sensitivity is improved, but control precision deteriorates
Solution Approach 1:
The integrated design simplifies the control mechanism by eliminating separate actuator components. The membrane and tunneling tip form a unified structure that responds directly to acoustic pressure, reducing the complexity of control circuits and improving precision in controlling the tunneling current while maintaining high detection sensitivity.
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 solution reduces vibration sensitivity and fabrication costs, enabling a wide acoustic bandwidth and high sensitivity, with the control voltage adjustments directly measuring sound pressure variations.
Implementation Method 1
Movement of the membrane relative to the tunneling tip is controlled by applying an electrical potential between the control electrodes and the membrane, causing the membrane to bend towards the electrodes, and hence the tip, due to electrostatic attraction.
Implementation Method 2
The quantum theory of surface tunneling focuses on the possibility that an electron can jump from the electron cloud on the surface of one material to an electron cloud on the surface of another material. An electron can only survive for a very short time in the 'forbidden' region. If an electron makes it across the region, it is said to have 'tunneled' through the region.
Data Source
AI summary
An electronic surface tunneling acoustic detector or microphone with very high sensitivity is disclosed. A tunneling tip is mounted on a rigid perforated suspension plate, along with control electrodes, which are used to move a conductive membrane suspended above the suspension plate into closer or farther proximity with the tunneling tip. An electrical potential between the control electrodes and membrane, causing the membrane to bend towards the electrodes, and hence the tip, due to electrostatic attraction. As the membrane is pulled toward the tunneling tip, at some point a tunneling current begins to flow in the tunneling tip. The control voltage is subsequently adjusted to achieve a steady-state tunneling current in the tip. As the membrane responds to differential acoustic pressure variations, it moves and therefore upsets the adjusts the control voltage to return the membrane to the steady-state condition. As a result, the adjustment of the control voltage is a direct measure of any sound pressure incident upon the membrane.