Gancang Saroja

A study of application of two probes at frequency 0.1 to 10 kHz in electrical impedance measurement system for various fats

Measurement of electric impedance by using two probe methods applied to various types of fat. This study is a development of previous research that performed fat impedance measurements at very low frequencies using LCR meter. In the analysis of the liquid medium, the two probe models may indicate a change in electrical properties of the material when the material contains a different liquid medium. The content of fatty acid saturated and unsaturated in fat will determine the electrical properties of the material. In this study, we will describe two probe-based electrical impedance measurements rather than mixtures of various dietary fats by applying a current of 1 μA at a frequency of 0.1 kHz to 10 kHz. Food fats used research such as lard, beef fat, chicken fat and vegetable oil. The results showed that, in general, the electrical impedance of fat decreased with the increasing of measurement frequency. The electrical impedance of chicken fat is smaller than the lard, while beef-fat, and vegetable oils are bigger than it. The impedance meter worked well at frequencies up to 2 kHz. The presence of a mixture of the lard will change the value of electrical impedance in different fats.

Study of Effect of Concentration of MnCl2 Solution on Intensity of VCD chip Spectrometer Imagery

Spectroscopy is study of interaction between radiation of wave and matter. In its application, spectroscopy has been used to observe and study the characteristics of a matter through its resulted spectrums. In this research, spectrometer was built with VCD chip and two kind of lamp sources, incandescent and fluorescent lamp. The MnCl 2 solutions with concentration 0, 1, 2, and 3 M were used as sample. Image-J software was used to analysis the resulted spectrums. The results showed an interaction between rays and the solution with indication the image intensity decreased.