Sensor Device Dual-Resonance Acoustic Assembly for Broader Sensitivity
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Solution Overview
Problem
Sensor devices, such as microphones, exhibit higher sensitivity only in a narrow frequency range near their resonant frequency, leading to reduced amplitude at non-resonant frequencies.
Innovation Solution
Incorporating a sound pickup assembly with a second resonant frequency, formed by a liquid, gel, or mass block in the acoustic cavity, to create a resonant system with the sensor assembly, adjusting parameters like viscosity, density, and modulus to achieve a frequency difference of 1000 Hz-10000 Hz, enhancing sensitivity across a wider frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor device operates near its resonant frequency, then sensitivity is improved, but the frequency range is limited to a narrow band
Solution Approach 1:
The patent divides the frequency response into multiple segments by introducing a sound pickup assembly with a second resonant frequency distinct from the sensor assembly's first resonant frequency. This segmentation allows the device to achieve high sensitivity at multiple discrete frequency points (first resonant frequency and second resonant frequency) rather than being limited to a single narrow band, thereby expanding the effective frequency range while maintaining sensitivity.
Solution Approach 2:
The patent creates a composite resonant system by combining the sensor assembly (with first resonant frequency) and the sound pickup assembly (with second resonant frequency) into a unified structure. This composite system leverages the resonant properties of both components to achieve enhanced sensitivity across a broader frequency spectrum, effectively resolving the contradiction between narrowband sensitivity and wideband adaptability.
2Measurement precision
If a single resonant frequency is used, then sensitivity is maximized at that frequency, but sensitivity drops at non-resonant frequencies
Solution Approach 1:
The patent segments the sensitivity profile by creating two distinct resonant peaks at different frequencies (first and second resonant frequencies). This segmentation ensures that the device maintains high sensitivity and stable output at multiple frequency points rather than experiencing a single peak followed by a drop-off, thereby improving overall output stability across the frequency spectrum.
Solution Approach 2:
The patent changes the resonant frequency parameter by introducing a second resonant frequency through the sound pickup assembly. This parameter change transforms the system from having a single sensitivity peak to having multiple peaks, ensuring that sensitivity remains high and output remains stable across a broader frequency range rather than dropping at non-resonant frequencies.
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 sensor device achieves improved sensitivity and stable output gain in a broader frequency band, with a flatter frequency response curve.
Implementation Method 1
when the sound pickup assembly vibrates in response to an air conduction sound transmitted through the sound inlet, vibrations of the sound pickup assembly may change a sound pressure in the acoustic cavity
Implementation Method 2
the sensor assembly may convert the air conduction sound into an electrical signal based on changes of the sound pressure in the acoustic cavity
Implementation Method 3
the liquid or the gel and a gas in the acoustic cavity may form a resonant system with the second resonant frequency
Data Source
AI summary
The embodiments of the present disclosure provide a sensor device, including: a sensor assembly with a first resonant frequency and a sound pickup assembly configured to communicate with an external sound of the sensor device through a sound inlet, wherein an acoustic cavity may be formed between the sound pickup assembly and the sensor assembly, when the sound pickup assembly vibrates in response to an air conduction sound transmitted through the sound inlet, vibrations of the sound pickup assembly may change a sound pressure in the acoustic cavity, and the sensor assembly may convert the air conduction sound into an electrical signal based on changes of the sound pressure in the acoustic cavity, wherein the sound pickup assembly may provide the sensor device with a second resonant frequency, and a difference between the second resonant frequency and the first resonant frequency may be in a range of 1000 Hz-10000 Hz.