I started yesterday to play with my scio to measure alcohol in wines
first I am using medical alcohol at 90% and made dilutions
using a small polycarnonate cavity sticked on alumnium reflective foil and micropipette to get reproducible thickness I reach for the 0-90% R2 =0.94
which is not too bad ( deviation of 6 % in volume )
for 8% to 33% R2 = 0.89 with about 2 % deviation
each time with only 6 samples repeated 2or 3 times
however we can’t hope a precision better than 1%
now I have to do this with water + sugar ( and then water alcohol and sugar )
problem I see is the shape of the meniscus with different chemical stuff in liquids
so best solution would be liquid between 2 plates but the upper one would absorbe part of the IR but to which extend ?
I don’t hope to measure anything else than sugar and alcool in beverage : the IR range is not large enough to get acids
( malic lactic acetic )
