What is a CO2 scrubber?
A carbon dioxide scrubber is a device that absorbs carbon dioxide and is used to treat gases from industrial plants or air in life support systems like rebreathers or in submersibles.
What is activated carbon and how does it work?
Activated carbon is processed carbon powder. It is riddled with many small low volume pores that increase the surface area and thus increase absorption. Due to its high degree of microporosity, one gram of activated carbon has a surface area in excess of 500 m^2 at room temperature or 0 degrees.
How does the CO2 sensor work?
NDIR's (Nondispersive Infrared Sensor) are generally constructed from an infrared lamp of sorts, a light tube, and a wavelength sampling chamber. Spectroscopy is used to electro-optically find the gas concentration based on the absorption of a specific wavelength. The detector has an optical filter which filters out all light except the wavelengths that the gas can absorb.
Why use dry ice?
Dry ice is the solid form of carbon dioxide. It is primarily used as a cooling agent and its advantages include lower temperatures than that of normal ice. Since it sublimates at -78.5 degrees at atmospheric pressure, that makes it ideal for testing for emissions of CO2.
Why did you choose acrylic for the frame?
Acrylic was proposed as it is a clear material that would be necessary to demonstrate the filter's inner workings. Also, it is fairly airtight after acrylic glue is applied.
How is the filter component made?
The filter is constructed from a sheet of fiberglass mesh filter with a layer of activated carbon in between and then covered by another sheet of fiberglass mesh.
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