Mobile Air Sensor With Micropump Channel
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Solution Overview
Problem
Existing portable gas measuring devices face challenges in providing fast and reliable measurements due to the time required for gas sensors to acclimatize to changing environments and the inefficiency of diffusion-based air sampling, which limits their use in applications requiring rapid response times.
Innovation Solution
A mobile device with a fluid channel and micropump system that quickly draws in ambient air and directs it to a sensor, reducing the distance and volume of the air pathway to minimize response time, allowing for rapid sensing of ambient air components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the sensor is mounted directly onto the housing surface to obtain rapid signal, then the response speed is improved, but the assembly requirements and assembly costs increase, and the sensor is at risk of damage by external influences
Solution Approach 1:
The device is divided into functional modules: a sensor module housed in a sensor housing, a separate micropump unit, and integrated circuit boards. This segmentation allows the sensor to be protected within its own housing while maintaining compact overall device structure and simplifying assembly procedures.
Solution Approach 2:
A fluid channel acts as an intermediary medium between the opening in the housing and the sensor, which are spaced apart. The micropump serves as an intermediary device to actively transport air through this channel, enabling rapid response without direct sensor mounting on the housing surface.
2Speed
If the sensor is installed on the outside of the gas measuring device, then the response speed is improved, but the housing can no longer be smooth and space for mounting multiple components is limited
Solution Approach 1:
The sensor is nested within a sensor housing that is integrated into the main device housing. The fluid channel is routed through the housing structure, allowing the sensor to be positioned close to the opening while maintaining a smooth external housing surface and efficient use of internal space.
3Device complexity
If diffusion-based air sampling is used, then the device structure is simple, but the measurement time is extended to several minutes
Solution Approach 1:
The passive diffusion process is replaced with an active micropump-based air sampling system. The micropump mechanically draws air through the fluid channel to the sensor, reducing measurement time from several minutes to seconds while maintaining a compact and relatively simple device structure.
Solution Approach 2:
A micropump is used to create controlled air flow through the fluid channel to the sensor, replacing passive diffusion with active pneumatic transport. This enables rapid air sampling and measurement while keeping the device structure compact and manageable.
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
Enables fast and reliable detection of gases and air components, potentially within seconds or microseconds, compared to minutes in conventional devices, facilitating early warnings and efficient air quality monitoring.
Implementation Method 1
a micropump configured to draw in ambient air through the opening and to convey the same to the sensor
Implementation Method 2
a sensor arranged in the fluid channel, configured to sense at least one component of the ambient air
Data Source
AI summary
A mobile device includes an opening defining a fluid connection between a fluid channel in the mobile device and ambient air, and a sensor arranged in the fluid channel, configured to sense at least one component of the ambient air. The mobile device further includes a micropump configured to draw in the ambient air through the opening and to convey the same to the sensor. According to the invention, the sensor is arranged spaced apart from the opening, and the volume of the fluid channel between the sensor and the opening is less than 200 microliters.