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Open hardware project ‘Freezing nucleation apparatus’


In an attempt to make immersion freezing assays more easy and reliable, in particular for larger sample volumes, such as precipitation samples or samples from liquid impingers, we have come up with a new apparatus. Its principle of operation is based on the reduction of light transmission through water upon freezing because light gets scattered by inclusions in ice, such as air bubbles and brine pockets. Two identical units of this apparatus have been operating well in Basel and in Avignon since a few months ago. So we think it is justified to bring this to the attention of others, who might want to build such an instrument. We see this as an open hardware (and software) project. The hardware is already documented online (, the software documentation is still in progress.

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