Würzburg 2018 – wissenschaftliches Programm

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DD: Fachverband Didaktik der Physik

DD 2: Postersitzung

DD 2.32: Poster

Montag, 19. März 2018, 15:00–16:40, Info - Foyer

An educational approach in measuring refractive indices of optical materials and the oscillating frequency of mechanically stimulated systems using an, Arduino based, modified Michelson's interferometer — •Georgios Mitsou¹ and Ioannis Sianoudis² — ¹Dept of Energy Technology Engineering — ²Dept. of Optics & Optometry, Technological Educational Institute (T.Ε.Ι.) of Athens, 122 43 Athens, Greece, email:gmitsou@teiath.gr

This work deals with the techniques, under an educational point of view, for measuring the refractive indices of materials and the frequency of vibrating systems. The former is based on the interferometry of a rotated parallel plate, while the determination of the frequency is done through the time-varying signal being recorded and processed with the FFT function provided by Pasco*s Data Studio program. The device consists of the Michelson interferometer, a sample rotation system consisting of a circular platform placed on the rotation axis of a servo motor controlled by an Arduino UNO, Rev3 microcontroller and an optoelectronic registration system. The refractive index of a parallel plates sample is determined by its rotation through measuring simultaneously a shift of interference fringes. On the other hand, due to recent developments in gravitational waves detection, the frequency determination procedure was developed as an educational model to make students understand the methods used in wave detection where large structures are employed.