24 October 2012 Speckle interferometry at 10 μm with CO2 lasers and microbolometers array
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Proceedings Volume 8412, Photonics North 2012; 84121O (2012) https://doi.org/10.1117/12.2001440
Event: Photonics North 2012, 2012, Montréal, Canada
Abstract
In this paper we present extension of electronic speckle pattern interferometry (ESPI) to the long wave infrared range which makes use of CO2 lasers and digital recording on microbolometer based uncooled thermographic cameras. The measurement range and accuracy of this technique is related to the wavelength of the laser. In visible light ESPI is often not well suited for field applications or for large displacement measurement due to the short wavelength used, which imposes high stability constraints. With wavelengths around 10 micrometers, corresponding to CO2 lasers, we have a typical 20 factor of decrease of the stability requirements; meantime the range of measurement is increased by the same factor. We will show some important steps for the development of the system and we will give some interesting results obtained in industrial non-destructive testing applications.
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Marc P. Georges, Jean-François Vandenrijt, Cédric Thizy, Igor Alexeenko, Giancarlo Pedrini, Wolfgang Osten, "Speckle interferometry at 10 μm with CO2 lasers and microbolometers array", Proc. SPIE 8412, Photonics North 2012, 84121O (24 October 2012); doi: 10.1117/12.2001440; https://doi.org/10.1117/12.2001440
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