Speckle interferometric technique to assess soap films |
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| Affiliation: | 1. Centro de Investigaciones Ópticas, CIOp (CONICET, CIC) and OPTIMO (Dpto. Fisicomatemática, Facultad Ingenierı́a, UNLP), P.O.Box 124, Gonnet La Plata 1900, Argentina;2. Departamento de Ciencias Básicas, Universidad EAFIT, Medellı́n, Colombia;3. Instituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy;1. Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China;2. Institute of Tsinghua-Berkeley Shenzhen, Tsinghua Shenzhen International Graduate School, Shenzhen 518067, China;1. Department of Clinical and Biological Sciences, University of Turin, Orbassano, Turin, Italy;2. Department of Medico-Surgical Sciences and Biotechnology, Vascular Biology and Mass Spectrometry Laboratory, Sapienza University of Rome, Latina, Italy;3. Foundation IRCCS Carlo Besta Institute of Neurology, Milan, Italy;4. Geriatric Division, A.O.U. San Luigi Gonzaga, Orbassano, Turin, Italy;1. Thermomechanical Metallurgy Laboratory – PX Group Chair, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-2002, Neuchâtel, Switzerland;2. Department of Materials Science and Engineering, Norwegian University of Science and Technology, Trondheim, N-7491, Trondheim, Norway |
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| Abstract: | An speckle interferometric technique to monitor the thinning process of vertical soap film before the film rupture is presented. The interferometric arrangement consists in a double aperture pupil optical system which images an input diffuser. In a first step, a reference specklegram is stored in the computer buffer memory. Afterwards, the soap film is located in front of one pupil aperture, an uniform displacement of the diffuser is produced and a new speckle pattern is stored. The soap film status is characterized in terms of the changes that this dynamic phase object introduces in the correlation fringes obtained by applying a FFT algorithm to the resulting summed specklegram. This procedure is done in real time as far as the soap film evolves in the successive status. It is experimentally demonstrated that the soap film during drawing acts as a variable wedge. The correlation fringes behavior becomes an important tool to establish the wedge shaped soap film angle and the thickness variations. |
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