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In this report, it has been shown that the combination of gold solution and vegetable oil resulted in strengthening in the change of natural polarization, or so-called optical activity. Some vegetable oils and a low concentration of gold solution had been used in this experiment. The individual change of polarization in gold solution and vegetable oils was firstly measured separately. And finally, the sample's combination of gold and oil was combined (unmixed) to obtain the sum of the change in polarization. The results show that the sum of the change in polarization is not a linear combination of its polarization of the sample, but rather is an amplification of final polarization without any loss of nature characteristic of the oil. This simple experimental method of polarization provides a potential tool to identify types of cooking oils and has a prospect of a study as trace detection as well for other relevant samples. [ABSTRACT FROM AUTHOR]

This paper reports that linear polarized light through a combination of silver colloidal solution and vegetable oil gives rise to enhancement in the change of light polarization. This experiment used some vegetable oils and a low concentration of silver solution up to 3.8 ppm. The optical activity of samples was characterized by the change of polarization using a simple pair of polarizers, 532 nm (green) and 632 nm (red) of pointer lasers. The enhancement was determined through the ratio of the change in polarization from a combination of silver solution and vegetable oil to the individual value of change of polarization from vegetable oil. The results show that the final change in polarization of the sample combination is not a linear summation of its polarization of the samples, but rather is a nonlinear enhancement of final polarization. The appearances of natural polarization of oil in the silver + oil combination have also remained. This simple polarization method at least has two advantages for further study, i.e. a potential method for investigation of the various condition of cooking oils and also a new perspective study for interaction between light with nanoparticle solution and relevant samples. [ABSTRACT FROM AUTHOR]

In this paper, we present the study of polarization characteristics of motorcycle engine lubricants. The characteristics testing was carried out using a light polarizer which is passed through the sample and the change of polarization angle was measured. The light source used in this method is a green laser with a wavelength of 532 nm and a red laser with a wavelength of 632 nm. The linear polarization through the sample was varied via the angle of polarization (0° - 90°) and additionally was used the external electric field (0 to 9 kV) to affect the sample. We show that there is a unique pattern of polarization from varying the angle and that the lubricant has an optical activity. It is also found that variation of external electric fields to the sample results in a nonlinear optics response in the form of a second-order polynomial. The identical behavior of natural and electro-optics polarization shows that the molecular forms of lubricant oils are relatively equal, and can be further developed comprehensively to investigate other kinds of oils. [ABSTRACT FROM AUTHOR]

Research on the modification of electrooptic instruments has been carried out. This study aims to design a digital-based automatic polarization angle measurement system that can be applied to determine the quality of cooking oil. The optical properties used as indicators to determine the quality of cooking oil using the polarization angle are relatively small, so a tool that can measure accurately is needed. A digital analyzer has been used with manual intensity determination, so that parallax errors can occur. In this research, an automatic polarizer will be made to determine the quality of cooking oil. The tool uses a light sensor as a minimum intensity detector and a stepper motor as an actuator which is connected to an analyzer using gears and uses Arduino due as a controller and data processor. The test results show that measurements have an accuracy of 0.033% in the malus law test. In the application of a tool to determine the quality of cooking oil, the results show that the change in the polarization angle for expired cooking oil is greater than the polarization angle for unexpired cooking oil. [ABSTRACT FROM AUTHOR]