[bernard]

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 )

 

• This reply was modified 8 years, 1 month ago by bernard.

[bernard]

question to Paul : so it means that you developped something to measure liquids ?

can you share the device design ?

what are the R2 and the deviation for vodka measures ?

thank you

• This reply was modified 8 years, 1 month ago by bernard.
• This reply was modified 8 years, 1 month ago by bernard.
• This reply was modified 8 years, 1 month ago by bernard.

[bernard]

 

I am also waiting  for this device .

the idea is to put the liquid between 2 plates with fixed thickness in between

sticked together with magnet for instance, material of upper plate should be as transparent as possible in NIR and bottom plate reflective

is it too difficult to achieve this ?

thank you

 

 

 

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