Ultrasonic Micropump Air Sampling Device
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Solution Overview
Problem
Current air pollution monitoring devices are cumbersome, costly, and limited in their ability to accurately assess personal exposure to particulate matter, particularly for the general population, due to their weight, noise, and limited sample sizes, which restricts the collection of reliable data on indoor and outdoor air pollution.
Innovation Solution
A portable aerosol sampling device with a design that eliminates the need for tubing, utilizing a printed circuit board and ultrasonic micropumps to create an airflow path with a size-selective inlet, allowing for direct coupling of components and reducing the device's size, weight, and noise, while maintaining precision and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional diaphragm pumps are used in personal air samplers, then airflow generation is achieved, but the device becomes heavy (>0.5kg), noisy (>60 dB), and requires periodic flow accuracy checks
Solution Approach 1:
The patent replaces the traditional mechanical diaphragm pump with an ultrasonic micropump that uses ultrasonic vibration to generate airflow. This substitution eliminates the need for moving mechanical diaphragms, thereby reducing device weight and eliminating the requirement for periodic flow accuracy checks while maintaining effective airflow generation for particle sampling
2Power
If traditional diaphragm pumps are used in personal air samplers, then airflow generation is achieved, but the device becomes noisy (>60 dB from the pump)
Solution Approach 1:
The patent replaces the mechanical diaphragm pump with an ultrasonic micropump that generates airflow through ultrasonic vibration rather than mechanical motion. This substitution dramatically reduces noise levels from >60 dB to below 30 dB, making the device suitable for wear in quiet environments while maintaining effective airflow generation
3Power
If tubing connections are used in personal air samplers, then airflow path is established, but connections become disconnected or pinched when the wearer is physically active
Solution Approach 1:
The patent merges the airflow path components directly into the device housing, eliminating separate tubing connections. The cyclone inlet, sampling filter, and airflow channels are integrated within the housing structure, creating a reliable airflow path that cannot become disconnected or pinched during physical activity
4Weight of moving object
If personal air samplers are made compact and lightweight, then wearability is improved, but measurement precision and accuracy may be compromised
Solution Approach 1:
The patent uses ultrasonic micropumping technology to replace traditional mechanical pumps, enabling compact device design without sacrificing measurement precision. The integrated cyclone inlet and sampling filter maintain accurate particulate matter separation and counting capabilities while the overall device weight is reduced to below 0.5kg, improving wearability for personal exposure studies
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 enables efficient and reliable collection of particulate matter data without the limitations of traditional monitors, providing more accurate and comprehensive air quality assessments for personal exposure studies.
Implementation Method 1
utilizing a printed circuit board and ultrasonic micropumps to create an airflow path
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A sampling device is constructed having an airflow (108) path from a size-selective inlet (158, 374) to a device outlet (160, 376), without using any tubing. The size-selective inlet (158, 374) includes at least one of an impactor, a filter, a cyclone, and an inhalable inlet (158, 374). The device includes a sampling assembly (212, 22) configured to be removably coupled directly to a sampling device housing (e.g., without using tubing), and an airflow assembly (132, 328) that may be constructed without using tubing.