Optical measurement of atmospheric carbon dioxide: Difference between revisions
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m Caoyuan moved page Air contaminant measurement with interferometry to Optical measurement of atmospheric carbon dioxide |
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==Setup== | ==Setup== | ||
===Components=== | |||
*Source | |||
A thermal/blackbody radiation source that can emit EM radiation at 4 micrometers. Can do it with a '''resistor'''. | |||
**Sensor and filter | |||
==Measurements== | ==Measurements== | ||
.... | .... | ||
Revision as of 22:20, 23 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 of a potential real-time reference design.
- 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
Components
- Source
A thermal/blackbody radiation source that can emit EM radiation at 4 micrometers. Can do it with a resistor.
- Sensor and filter
Measurements
....
