New Technique for Sensing Gas Molecules Measurements

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Researchers created a method to take the spectroscopic measurements of a gas molecule using imaging technique known as ghost imaging.

An international team of researchers comprising Tampere University of Technology in Finland, the University of Eastern Finland and the University of Burgundy Franche-Comté in France, analyzed different range of wavelengths to find the best measurements of atmospheric greenhouse gases such as methane. Their findings were published in the journal Optical Society (OSA) journal Optics Letters on October 2018, where the scientists reported the ghost imaging approach for producing correct measurements and composition of a gas molecule.

The researchers used ghost imaging with a supercontinuum light source, and demonstrated the measurement of methane with subnanometer resolution. They were able to trap wavelength-dependent light that transmitted through samples. The method detects all the wavelengths mixed together, creating a much stronger signal that allows more sensitive measurements.

Caroline Amiot, a research team member from Tampere University of Technology, said: “Monitoring atmospheric greenhouse gases such as methane, carbon dioxide, nitrous oxide and ozone is important for assessing how changing levels of these gases relates to climate change. In some specific circumstances, our method could enable more sensitive detection of greenhouse gases, providing more accurate information about these important chemical compounds.”

Tiny molecules of gases lightly effect the total light transmittance as they are sparsely located, therefore powerful light sources or extremely sensitive detectors are generally needed to detect transmittances. The team is working on upgrading their created technique by using pre-programmable light sources, which would remove the need to measure the reference spectral patterns.

 

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