Michelson Interferometer Automated Fringes Counting System Via Point Source

Chong, Yong Kai (2016) Michelson Interferometer Automated Fringes Counting System Via Point Source. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

Text Chong Yong Kai RPS thesis final version.pdf Restricted to Registered users only Download (2MB)

Abstract

This thesis describes a Michelson Interferometer used in measuring the wavelength of a LASER source by an NI Automated Fringes Counting System via point source, the method being analogous to a point detector. The automated fringes counting system is designed and built up through National Instrument (NI) LabVIEW programming. The Michelson Interferometer is assembled with a beam splitter, a fixed mirror (adjustable mirror) and a movable mirror. Real-time fringes pattern image is captured by a CCD camera with a resolution of 1390 x 1038, approximately 1.4 Mega-pixels on viewing screen made up of a blank white A4 paper tapped to a board that is clamped vertically. Using edge detection via point measurement, with 30% pixel threshold intensity contrast. The percentage error of wavelength measured with the most accurate wavelength is 631.6nm for N = 150 with an error percentage of 0.32% and average wavelength of 644.9nm with an error percentage of 1.18%.