Two-wavelength contouring with a pulsed ruby laser by employing TV-holography

Autor:	Yunlu Zou, Giancarlo Pedrini, Hans J. Tiziani
Rok vydání:	1996
Předmět:	Contouring Materials science business.industry Ruby laser Holography Laser Atomic and Molecular Physics and Optics law.invention symbols.namesake Wavelength Fourier transform Optics law Electronic speckle pattern interferometry symbols business Fabry–Pérot interferometer
Zdroj:	Journal of Modern Optics. 43:639-646
ISSN:	1362-3044 0950-0340
DOI:	10.1080/09500349608232771
Popis:	A two-wavelength surface contouring system based on electronic speckle pattern interferometry (ESPI) with a pulsed ruby laser is reported. Two states of the test object were recorded at different wavelengths of the laser. The wavelength change was controlled by altering the temperature of the output etalon. The phase information of the surface contour can be obtained by using either the sinusoid fitting method or the Fourier transform method. Contour intervals of about 14 mm and 7 mm are available.
Databáze:	OpenAIRE
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