Vibration-Damped Gas Sensor Housing With Water-Blocking Venting
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Solution Overview
Problem
Existing gas sensors are susceptible to vibrations and environmental conditions, leading to inaccurate gas concentration measurements due to structural noise and water ingress, which affects the response time and reliability.
Innovation Solution
A sensor device with a vibration damping material, such as synthetic rubber foam, surrounded by a non-porous sealing and flexible connecting means, isolates the sensor module from mechanical vibrations and protects against water ingress, ensuring rapid gas diffusion and accurate readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sensor module is directly mounted on the housing, then the device structure is simple, but the sensor is susceptible to vibrations and structural noise
Solution Approach 1:
A vibration damping material is introduced as an intermediary between the sensor module and the housing. This damping material absorbs and dissipates vibration energy, preventing direct transmission of structural noise to the sensor module while maintaining a relatively simple overall device structure.
2Reliability
If a sealing is used to protect the sensor module, then water ingress is prevented, but gas diffusion may be blocked
Solution Approach 1:
The sealing element is designed with a porous structure that allows gas molecules to diffuse through while physically blocking liquid water. The porous configuration provides pathways for gas diffusion that maintain rapid response capability while the overall sealing structure prevents water ingress into the sensor module.
3Reliability
If the vibration damping material is exposed to liquid water, then the material degrades and vibrations increase, but a non-porous sealing blocks gas diffusion
Solution Approach 1:
The sealing element uses a porous material configuration that specifically blocks liquid water through capillary action and physical barrier effects while maintaining open pathways for gas diffusion. This allows the vibration damping material to remain protected from water degradation while gas molecules continue to diffuse freely through the sealing structure.
4Stability of the object's composition
If the glass transition temperature of the polymer is above the minimal expected temperature, then the material maintains structural stability, but vibration damping capability decreases
Solution Approach 1:
The polymer material is selected with a glass transition temperature below the minimal expected operating temperature to ensure the material remains in its flexible, vibration-damping state. This parameter selection allows the polymer to maintain both structural stability and vibration damping capability across the full range of expected operating conditions.
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 effectively dampens vibrations and prevents water ingress, maintaining accurate gas concentration measurements under harsh conditions, enhancing the sensor's reliability and response time.
Implementation Method 1
vibration damping material between the sensor module and the housing
Implementation Method 2
The sensor device comprises vibration damping material between the sensor module and the housing
Implementation Method 3
the housing, the sealing, and the first side are arranged and configured such that liquid water cannot enter the vibration damping material
Implementation Method 4
There are many porous sealing materials, such as expanded PTFE, that protect from liquid water while at the same time being permeable to water vapor or other molecules in the gas phase
Implementation Method 5
a photoacoustic gas sensor for the detection of trace amounts of methane
Implementation Method 6
an apparatus for measuring changes in light absorption exhibited by an optical component upon exposure of the optical component to light
Data Source
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AI summary
A sensor device robust against vibrations is proposed. A sensor module is encapsulated with a housing and the space in between is filled with a vibration damping material such that the sensor module is only supported by the vibration damping material. A cavity in the housing formed partly by the sensor module and sealed against liquid water but permeable to a target component of ambient air allows for a fast sensor response time.