What sort of wavelength of sensor do you need for ABV measurements? Size of ethanol particle? Half it because of Nyquist? Or what does it have to relate to?
I'm just wondering how fancy vs. DIY you need for that sort of purpose basically.
This is the paper I've been looking at - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3356901/ they make use of a tungsten lamp and IR leds, I tried with just a tungsten lamp and only really saw a plateau around 900nm when ethanol was present. Their spectrometer goes further into IR than mine, mine tops out around 1000nm, but hopefully I'll still be able to get some results when I add IR LEDs.
I'm not sure what the peaks correspond to regarding the ethanol molecule though afraid. It's been a while since I read the paper, but maybe that indicates this.
I believe my spectrometer just has a linear CCD sensor.
For ABV you'd usually use refractive index, there are low cost non-electronic refractometers, you can also use density. Alcohol doesn't absorb much light so generally not done by UV or IR.
I'm just wondering how fancy vs. DIY you need for that sort of purpose basically.