A MICHELSON INTERFEROMETER AS A CALIBRATION TOOL OF A RADIAL IN-PLANE DIGITAL SPECKLE INTERFEROMETER

Matías Roberto Viotti, Armando Albertazzi G. Jr., Ricardo Suterio

Abstract

The paper reports on the use of a Michelson interferometer for calibration of a radial in-plane digital speckle pattern interferometer. Also presents a numerical method to calculate a correction factor from the assessment of the displacements measured with both interferometers. This factor allows correcting mistakes introduced in the measurement process and generated mainly by a laser diode, which is used as light source of the digital speckle pattern interferometer. The description of the experimental set up and calibration procedure are presented. Experimental results obtained during one calibration process are also given. Finally, it will be demonstrated that the calibrated RIP system can measure displacements with a smaller average deviation, once the experimental results were analyzed and the calibration process was carried out, since it diminished from 6.2 % up to 1.5 %.

Keywords

Michelson interferometer, ESPI, radial interferometer, length measurement

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PWC-2006-TC15-003u.pdf

DOI

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IMEKO TC

TC15 - Experimental Mechanics

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