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Yanbing Cui, Sarah Kramer, Michael Tracey, Amanda Urick , Eric Wong. Department of Biomedical Engineering, Columbia University, New York, NY. Design Motivation. Prototype. Testing. Location Tracking, Environmental, and Physiological Parameters Particulate Collector
Department of Biomedical Engineering, Columbia University, New York, NY
Relevance of Environmental and Physiological Parameters
Airborne Particulate Collection
Figure 2: Location, ambient temperature, ambient humidity, and body temperature are all automatically logged to flash memory through a portable microcontroller. All parameters can then be correlated via timestamp and uploaded to a report which is generated for each user. Images are also taken via a time-lapse, and will be used as waypoints to which time correlated data can be added. Figure 2 shows the GPS, sensors, and flash memory interfaced with an ArduinoDuemalonove. The entire unit has a very small form factor.
Figure 5: Data was exported to a .csv file and manipulated to display raw humidity, environmental and body temperature. This data is also correlated with the map waypoints for user viewing. One can see the body temperature reducing as the cold air interacts slightly with the thermistor. Environmental temperature and humidity increases midway, while walking past John Jay cafeteria.
Figure 3: The particulate collector uses a high power fan to draw air through the 30 micron nylon mesh filter. The cartridge is actuated by the servo motor at programmed time intervals to allow air to flow through each individual wedge. A total of eight samples can be taken over the course of the day, and the fan runs for 10 minutes at each designated sampling time.
Figure 1: Our current prototype encompasses all of these design specifications. Electronic components and a particulate filter reside in the outermost pocket. Discreet external sensors collect environmental parameters and track location – this data is stored in removable and easily accessible memory.
Pollen was collected for ten minutes, filters removed, and analyzed. The image at left is representative of isolated pollen, while the image at right shows the pollen that has collected on the surface of our nylon mesh filter. Images taken at 10x.
Figure 4: A GUI is used to quickly program the microcontroller which actuates the particulate collector. (a) Sampling times can be entered at a standard interval – ie. class times – or individually. (b) The user report can also be accessed via this GUI. (c) All parameters are added to photo EXIF data, and displayed via Google Maps. Future iterations will include a search engine which will allow a user to search for specific triggers, locations, or stress responses.