CV. RISKY

This research examines the Design and Construction of Simple measurement instrument of light intensity absorption coefficient base on computer. The constructed instrument was designed and built for measure the absorption coefficient of Visible-light

In this research, we used CuSO4, FeSO4, and FeCl3 as the sample of measurement. The correlation between spectrophotometer data and the constructed instrument data have near correlation. For CuSO4 in spectrophotometer measurement with selected wavelenght (λ) = 500 nm and CuSO4 in the constructed instrument measurement with blue light the coefficient correlation (r) 0,865 and coefficient of determinant (r2) is 74,9%. For CuSO4 in spectrophotometer measurement with λ = 500 nm and CuSO4 in the constructed instrument measurement with yellow light r = 0,934 and r2 = 87,2%. For CuSO4 in spectrophotometer measurement with λ = 500 nm and CuSO4 in the constructed instrument measurement with orange light r = 0,874 and r2 = 76,4%. For FeSO4 in spectrophotometer measurement with λ = 500 nm and FeSO4 in the constructed instrument measurement with blue light r = 0,865 and r2 = 74,9%. For FeSO4 in spectrophotometer measurement with λ = 500 nm and FeSO4 in the constructed instrument measurement with yellow light r = 0,934 and r2 = 87,2%. For FeCl3 in spectrophotometer measurement with λ = 500 nm and FeCl3 in the constructed instrument measurement with blue light r = 0,915 and r2 = 83,7%. For FeCl3 in spectrophotometer measurement with λ = 500 nm and FeCl3 in the constructed instrument measurement with yellow light r = 0,934 and r2 = 87,3%. For FeCl3 in spectrophotometer measurement with λ = 500 nm and FeCl3 in the constructed instrument measurement with orange r = 0,933 and r2 = 87,2%. It could see that values of coefficient correlation (r) of each measurement are near 1.

There are some factor Influences absorbance measurement i.e. the liquids condition and the chosen wavelength. The liquids condition made some spectrophotometer reading change randomly every 0.3 second. This was happened because after a few hours, the color of liquids becomes turbid. However, it wasn’t happened to all liquids. Some liquids remain in normal condition after several hours.

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