Real-time three-sensitivity measurements based on three-color digital Fresnel holographic interferometry

Laboratoire d'Acoustique de l'Université du Maine and the National Center For Scientific Research (CNRS), Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans, France.
Optics Letters (Impact Factor: 3.29). 06/2010; 35(12):2055-7. DOI: 10.1364/OL.35.002055
Source: PubMed


This Letter presents a method for real-time 3D measurements based on three-color digital holographic interferometry. The optical setup is considerably simplified, since the reference beams are combined into a unique beam. A convolution algorithm allows the three monochrome images to be superposed to provide simultaneous full-field 3D measurements. Experimental results confirm the suitability of the proposed method.

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Available from: Patrice Tankam, May 16, 2014
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    • "Phase imaging measures the optical path length map associated with transparent specimens (transmission illumination) or opaque surfaces (reflection illumination) and translates this data into relevant information. In such a way, biomedical imaging [7] [8] [10] [11], topology at nanoscale [9] [19], flows and vortices [16] [17], material properties [19], surface shape [20], polarization imaging [21], displacement field [22] [23], vibrations [24] [25] [26] [27], particles tracking [28] [29] [30] [31], measurement of temperatures or thermal exchanges in flames [32] [33] were investigated. Off-axis methods provide the fastest acquisition rates, because the phase information is extracted from a single recorded hologram. "
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    ABSTRACT: This article presents a digital three-wavelength holographic interferometer based on the use of two Wollaston prisms. This provides an in-line setup with quasi common-path and as a consequence there is no additional independent reference wave to be added. Thus, immunity to external perturbations such as vibrations or thermal perturbations is achieved. Furthermore, the set-up exhibits a single shot and real time capability which is very useful to study dynamic events. By using the two Wollaston prisms in an astigmatic configuration, spatial carrier frequencies can be adjusted both in amplitude and orientation. The digital hologram processing is based on Fourier processing and filtering around the carrier spatial frequency so that phase shifting is not required. The use of three wavelengths leads to visualizing directly the zero order fringe and regions for which there is no air density variation in a dynamic flow. Experimental proof of concept is demonstrated with a supersonic jet when the injection pressure varies.
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    • "En outre, les configurations interférométriques de MHD donnent également des images représentant quantitativement la phase optique de l'échantillon observé [8]. Enfin, diverses études ont montré l'intérêt d'utiliser une source à plusieurs longueurs d'ondes en holographie numérique, notamment pour l'observation en couleur et l'analyse spectrale [9] [10] [11] [12] [13], la réduction du bruit de speckle [10] [14] [15], le déroulage de la phase [16] [17] [18], l'utilisation de nouveaux critères de refocalisation [19] [20] [21] et la reconnaissance d'objets colorés [22] [23]. "

    Preview · Article · Nov 2014
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    • "However, such an architecture guarantees a maximum spatial resolution since the number of effective pixels for each wavelength corresponds to that of the full sensor. Recently, authors have first evidenced that digital color holograms could be recorded/reconstructed, thanks to a sensor based on a strategy using a stack of photodiodes with 1060 Â 1414 pixels sized 5 Â 5 mm 2 [15] [16] [17] [18] "
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    ABSTRACT: This paper presents the experimental optical analysis of the crack inside an electronic component. The optical setup is used to carry out multidimensional deformation measurements using digital color holography and the spatial multiplexing of holograms. Since the Fresnel transform method depends on wavelength, a wavelength-dependent-zero-padding algorithm is described and results in a rigorous sizing of each reconstructed monochrome image. The criterion to optimize the parameters is presented and is based on minimizing the widening of the impulse response of the full recording/reconstruction process. The application of the proposed method is illustrated through the analysis of the mechanical deformation of the electronic component, and offers keys to understand its failure mode in industrial conditions.
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