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Optical measuring systems came to offer new ways to determine distances, deformations or vibrations through more accurate and greater range methods. Technological progress has allowed a significant improvement of several components, including the optical ones. Thus, the development of essential measurement methods is crucial to keep up with technological advances.In this paper, the three basic methods of measurement are studied – triangulation, telemetry and interferometry, covering their maindoi:10.5539/apr.v9n4p33 fatcat:bea7dwsi7zbr7ng5i7khnegx5q