Acoustic Wave Sensor Housing Thermal Insulation
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Solution Overview
Problem
Devices for detecting acoustic waves face challenges in achieving high signal-to-noise ratios due to thermal fluctuations of gas inside the housing, which induce noise through pressure fluctuations, often masking the desired acoustic signals.
Innovation Solution
The inner surface of the housing is made at least half of its area with a thermally insulating material, reducing the thermal link between the interior and exterior, thereby shifting thermally induced noise to lower frequencies outside the detection range of the acoustic wave sensor, improving the signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the housing is made of metal with high thermal conductivity, then the housing provides good thermal dissipation and structural strength, but thermal fluctuations of gas inside the housing induce pressure fluctuations that increase noise level
Solution Approach 1:
The patent applies local quality by making only specific portions of the housing inner surface thermally insulating rather than the entire housing. The thermally insulating portions are strategically positioned to reduce thermal fluctuations in regions that would otherwise generate noise, while other portions may remain thermally conductive for structural or other functional reasons.
Solution Approach 2:
The patent employs composite materials by combining thermally insulating materials with the housing structure. The housing comprises a combination of thermally insulating portions and potentially other materials, creating a composite structure that balances thermal management requirements with noise reduction goals.
2Object-generated harmful factors
If the inner surface of the housing is made of thermally insulating material, then thermal fluctuations are reduced and noise level decreases, but thermal link between interior and exterior is weakened
Solution Approach 1:
The patent applies local quality by making only specific portions of the housing inner surface thermally insulating rather than the entire housing. The thermally insulating portions are strategically positioned to reduce thermal fluctuations in regions that would otherwise generate noise, while other portions may remain thermally conductive for structural or other functional reasons.
Solution Approach 2:
The patent applies partial action by using thermally insulating material covering at least half but not necessarily all of the inner surface area. This partial coverage is sufficient to achieve the desired noise reduction while maintaining some thermal link through the remaining conductive portions.
3Measurement precision
If thermally insulating material is applied to the housing inner surface, then signal-to-noise ratio improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by making only specific portions of the housing inner surface thermally insulating rather than the entire housing. The thermally insulating portions are strategically positioned to reduce thermal fluctuations in regions that would otherwise generate noise, while other portions may remain thermally conductive for structural or other functional reasons.
Solution Approach 2:
The patent applies partial action by using thermally insulating material covering at least half but not necessarily all of the inner surface area. This partial coverage is sufficient to achieve the desired noise reduction while maintaining some thermal link through the remaining conductive portions.
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 configuration effectively suppresses thermally induced noise, enhancing the signal-to-noise ratio by isolating the interior from external heat sources, allowing for clearer detection of acoustic waves within the desired frequency range.
Implementation Method 1
The inner surface of the housing wall is made in at least half of its entire area of a thermally insulating material
Data Source
AI summary
A device for detecting acoustic waves may include a housing having a housing wall with an inner surface, and an acoustic wave sensor provided at least partially inside the housing and configured to detect acoustic waves. The inner surface of the housing wall is made in at least half of its entire area of a thermally insulating material.