Biogeosciences
Biogeosciences
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Articles | Volume 18, issue 3
Articles | Volume 18, issue 3
https://doi.org/10.5194/bg-18-775-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-18-775-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 18, issue 3
Technical note
 | 
02 Feb 2021
Technical note |  | 02 Feb 2021

Technical note: A universal method for measuring the thickness of microscopic calcite crystals, based on bidirectional circular polarization

Luc Beaufort, Yves Gally, Baptiste Suchéras-Marx, Patrick Ferrand, and Julien Duboisset

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Latest update: 28 May 2023
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Short summary
The coccoliths are major contributors to the particulate inorganic carbon in the ocean. They are extremely difficult to weigh because they are too small to be manipulated. We propose a universal method to measure thickness and weight of fine calcite using polarizing microscopy that does not require fine-tuning of the light or a calibration process. This method named "bidirectional circular polarization" uses two images taken with two directions of a circular polarizer.
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