In this article, the design of a photometer circuit based on current-to-frequency converter is presented. This piecewise linear that makes most feedback to ensure relationship between input photocurrent and output frequency. Here, Proteus simulations were used verify performance proposed circuit, electronic experimental results shown be in total agreement. The showed rejected better additive wh...

When a suspension of particle is irradiated with a collimated beam of monochromatic polarized light of a wavelength close to the particle size and the intensity of the scattered light is measured as a function of angle, the scatter intensity is characterized by a series of relative maxima and minima. The nature of the signal depends on several significant variables that are characteristic of th...

The main source of error in the determination of bilirubin in serum by the diazo reaction has been the loss caused by adsorption on the protein precipitate. In addition, the lack of an accurately matching artificial standard and the sensitivity of the azobilirubin color to changes in pH have made accurate calorimetric determinations impossible, without the aid of some type of objective photomet...

The color of wine is an important quality parameter essential for the first impression consumers. International Organization Vine and Wine (OIV) recommends two methods to describe color: calculation according Glories determination coordinates in CIE L*a*b* space. measurement often not feasible winemakers because required instrumentation expensive bulky. In this study, influence photometer setti...