12 September 2014 Stand-off and up-close Raman detection of nitrates buried in sand and soils
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Raman measurements, using a 785nm laser, are taken of Ammonium Nitrate and Sodium Nitrate buried in sand. Nitrate is kept in clear plastic containers and buried underneath sand at various depths. Raman measurements are then taken at distances of 5m and 20m, with the sand being completely dry as well as completely wet. A different set of experiments was conducted with Nitrate buried in sand in a glass container, where no Raman signal was seen in dry sand. Water was then added at the edge of the container and allowed to migrate to the bottom. Raman measurements are then taken at a distance of 7mm over time to detect Nitrates brought to the surface by water as it wicks to the surface.
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Carlton Farley, Carlton Farley, Sandra Sadate, Sandra Sadate, Aschalew Kassu, Aschalew Kassu, Belther Monono, Belther Monono, William Witt, William Witt, Jonathan Bibb, Jonathan Bibb, Anup Sharma, Anup Sharma, "Stand-off and up-close Raman detection of nitrates buried in sand and soils", Proc. SPIE 9219, Infrared Remote Sensing and Instrumentation XXII, 92190J (12 September 2014); doi: 10.1117/12.2062184; https://doi.org/10.1117/12.2062184

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