Sensor Housing Airflow Chamber for Ambient Equilibration
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Solution Overview
Problem
Conventional devices with sensors housed inside a device limit the sensors' ability to accurately detect ambient environmental conditions due to restricted access and potential moisture intrusion through multiple openings.
Innovation Solution
A sensing device with a housing that includes a chamber surrounding the sensors and an air flow pathway, allowing for direct airflow from the exterior to the sensors, which quickly equilibrates with ambient conditions, enhancing data accuracy while maintaining a sealed and moisture-resistant design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are positioned within the device housing, then the sensors are protected from damage, but the sensors' ability to accurately detect ambient environmental conditions is limited
Solution Approach 1:
The housing is segmented into a sealed internal chamber containing the sensors and an external air flow pathway. This segmentation allows the sensors to remain protected within the sealed housing while still enabling ambient air to reach them through the air flow pathway, thus resolving the contradiction between protection and detection accuracy.
Solution Approach 2:
An air flow pathway acts as an intermediary between the external environment and the sensors. This pathway allows ambient air to reach the sensors without requiring direct exposure, thus maintaining both sensor protection and accurate ambient condition detection.
2Measurement precision
If multiple openings are added to the housing to improve sensor access to ambient conditions, then sensor access is improved, but the housing and components become more susceptible to moisture intrusion
Solution Approach 1:
The housing is divided into a sealed internal chamber and an external air flow pathway. This segmentation allows air to reach the sensors through the controlled pathway while the sealed chamber prevents moisture from entering and damaging the sensors and circuit board.
Solution Approach 2:
The air flow pathway serves as an intermediary that allows ambient air to reach the sensors while the sealed housing acts as a barrier against moisture intrusion. This intermediary pathway enables air flow without compromising the sealed environment.
3Measurement precision
If multiple openings are created in the housing to allow ambient conditions to filter through, then sensor access is provided, but a significant amount of time is required for ambient conditions to filter through the entire housing
Solution Approach 1:
The air flow pathway extracts the air flow function from the bulk housing structure. By creating a dedicated pathway that directly connects the external environment to the sensor chamber, the system eliminates the need for ambient conditions to slowly filter through the entire housing volume, thus reducing equilibration time.
Solution Approach 2:
Instead of relying on diffusion through the three-dimensional housing volume, the air flow pathway creates a direct one-dimensional flow path from the external environment to the sensors. This dimensional change in the air flow path significantly reduces the time required for ambient conditions to reach the sensors.
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 provides more accurate readings of environmental conditions by ensuring quicker equilibration with ambient conditions and reducing moisture susceptibility through a sealed chamber with an air flow pathway, improving sensor performance without compromising the device's IP rating.
Implementation Method 1
An air flow pathway, such as an air gap or one or more apertures, may be provided between an outer edge of the activation member and an opening in one of the walls of the housing or through a head member of the activation member to provide an air flow pathway from an exterior of the housing to the one or more sensors in the chamber
Data Source
AI summary
An apparatus, such as a sensor device, may include a housing. The housing may include a top wall, bottom wall, and one or more side walls that define a cavity. A circuit board may be positioned within the housing. One or more chamber side walls may surround a portion of the circuit board and define a chamber within the cavity of the housing. A pathway may be provided that defines a fluid communication channel between the portion of the circuit board and an exterior of the housing. For example, a portion of the pathway may be provided along a perimeter of or through an activation member, such as a push-button or switch positioned along an exterior of the housing.