Measure absorbance of a liquid for a given color

razor7877 / SpectroPi

A project about creating a cheap and simple UV-VIS spectrophotometer using a Raspberry Pi

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Measure absorbance of a liquid for a given color #4

Open razor7877 opened 4 months ago

razor7877 commented 4 months ago

Try to use a photoresistor to measure the absorbance of a liquid for one single color (without necessarily knowing the wavelength yet)

[ ] Measure the intensity of the color going through an empty cuvette
[ ] Measure the intensity of the color going through a pure liquid (dH2O)
[ ] Measure the intensity of the color going through the colored liquid (colored solute in dH2O)

razor7877 commented 3 months ago

Some rough measurements of the entire diffracted light spectrum:

No cuvette: 6.55 Empty cuvette: 5.37 DI Water: 5.49 Bromophenol blue (9.0x10^-6 M): 4.59

A first absorbance calculation is as follows: A = Log(5.37 / 4.59) = 6.81x10^-2 / 0.0681

razor7877 commented 3 months ago

prototype_setup The first prototype to measure the total absorbance (without selecting a specific wavelength/color) of various liquids

razor7877 commented 3 months ago

resin_slit A small slit was 3D printed using UV resin to try and select colors from the diffracted spectrum

razor7877 commented 3 months ago

near_ir near_uv Some first very rough attempts to select a color from the diffracted spectrum. The spectrum is far too thin. A wider spectrum would make it much easier to select a specific color (red/yellow/green/blue/purple).