Optical measurement of atmospheric carbon dioxide: Difference between revisions
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===Possible measurement mechanisms=== | ===Possible measurement mechanisms=== | ||
#Spectroscopy. Carbon dioxide has absorption peaks at 15, 4.3, 2.7 and 2 μm. With a laser/source of such wavelength and the correct filter, we could judge the concentration by absorption levels. See ====viasala | #Spectroscopy. Carbon dioxide has absorption peaks at 15, 4.3, 2.7 and 2 μm. With a laser/source of such wavelength and the correct filter, we could judge the concentration by absorption levels. See [https://www.vaisala.com/en/measurement/carbon-dioxide-co2-measurements?utm_medium=cpc&utm_source=google&utm_campaign=VIM-GLO-EN-MULTI-CO2-CO2_General_measurements&gad_source=1&gclid=Cj0KCQiAwtu9BhC8ARIsAI9JHam-XXVyI69He5NACVOxnr58TmdJ61t1D-_2SixL8PRPyUqYnOG6hdoaAsnOEALw_wcB viasala] for inspiration. | ||
#Interferometry. Carbon dioxide has a slightly different refraction index for all wavelengths. By observing the change in interference patterns, we can tell if there is a change in carbon dioxide concentration due to a change in effective path length. | #Interferometry. Carbon dioxide has a slightly different refraction index for all wavelengths. By observing the change in interference patterns, we can tell if there is a change in carbon dioxide concentration due to a change in effective path length. | ||
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Revision as of 16:56, 20 February 2025
Team members
Ta Na
Cao Yuan
Gao Yihan
Qi Kaiyi
Chen Yiming
Idea
Climate change has already become one of the most important challenges humanity faces. Carbon dioxide, the major greenhouse gas, is 'heating up' the Earth's atmosphere as they have an absorption peak in infrared wavelengths.
This project aims to build a portable and accurate carbon dioxide concentration measurement device.
Possible measurement mechanisms
- Spectroscopy. Carbon dioxide has absorption peaks at 15, 4.3, 2.7 and 2 μm. With a laser/source of such wavelength and the correct filter, we could judge the concentration by absorption levels. See viasala for inspiration.
- Interferometry. Carbon dioxide has a slightly different refraction index for all wavelengths. By observing the change in interference patterns, we can tell if there is a change in carbon dioxide concentration due to a change in effective path length.
Setup
We plan for a setup as a michaelson interferometer with a gas chamber on one arm to fill in contaminants.
Measurements
....
