Pressure measurement by low coherence speckle interferometry membrane shaping with tunable diode lasers
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2018
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SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE
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Resumo
Non-contact evaluation of object deformation is
of great importance in several industrial and scientific
processes. In this work the demonstrate that low-coherence
digital speckle pattern interferometry can be employed for
pressure measurement by the analysis of a 0.4-mm thickness,
55-mm diameter circular aluminum membrane submitted to a
pressure differential ranging from 0 to 90 kPa. The membrane
deformation was measured with a tunable red diode laser
emitting simultaneously two wavelengths. The resulting speckle
image of the membrane appeared covered with interference
fringes which correspond to the contour lines of the studied
surface. By means of conventional fringe pattern evaluation
methods like 4-stepping and unwrapping methods the
membrane deformation was determined. The experimental
results were compared with the ones obtained by a numerical
algorithm.
Como referenciar
SAITA, MARCELO T.; BARBOSA, EDUARDO A.; DEGASPERI, FRANCISCO T.; WETTER, NIKLAUS U. Pressure measurement by low coherence speckle interferometry membrane shaping with tunable diode lasers. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, October 08-10, 2018, Campinas, SP. Proceedings... Piscataway, NJ, USA: IEEE, 2018. DOI: 10.1109/SBFoton-IOPC.2018.8610915. Disponível em: http://repositorio.ipen.br/handle/123456789/30137. Acesso em: 20 Mar 2026.
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