Dynamic Holographic Interferometry: Devices and Applications

Lemaire, Philippe; Georges, Marc

doi:10.1007/978-0-387-34728-8_8

Cited by 11 publications

(8 citation statements)

References 40 publications

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“…The laser light comes from a continuous diode pumped solid state laser, frequency doubled at 532 nm. 16,20 However, their drawback is their very low diffraction efficiency, on the order of 10 −4 without an applied electric field. It is further split into the object and reference beams by the variable beamsplitter (VBS) assembly.…”

Section: Basic Configuration: Photorefractivementioning

confidence: 99%

“…The laser beam is brought by an optical fiber and is collimated by a lens in the fiber connector. 20 The consequence is that the diffracted beam will have an intensity much smaller than the one of the transmitted beams. The latter is constituted by a polarizing beamsplitter (BS) cube with an input half-wave plate for changing the reference/object power ratio.…”

Section: Basic Configuration: Photorefractivementioning

confidence: 99%

“…Some review papers or textbooks that have been recently published are specifically devoted to the use of digital holography for MEMS behavior investigations. It was used in a variety of applications in deformation metrology and nondestructive testing, 17-20 vibration mode shape observation, 15,17,19,20 cultural heritage, 21 and recently for comparison between measurements and with finite element modelling. 12 The present paper shows the development of a holographic interferometer adapted to MEMS deformation measurements which uses a photorefractive crystal (PRC) as the recording medium for a dynamic hologram recording.…”

Section: Introductionmentioning

confidence: 99%

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Photorefractive holographic camera for monitoring deformations of MEMS

Georges

Thizy

2015

J. Micro/Nanolith. MEMS MOEMS

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Downloaded From: http://nanolithography.spiedigitallibrary.org/ on 08/20/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspxAbstract. We present the development of a holographic interferometer based on a dynamic hologram recording with photorefractive crystals of the sillenite family and which is adapted for the observation of MEMS. A compact portable system was already presented in the past and used in various metrology and nondestructive applications on large scattering objects. The great versatility of the instrument, which allows high-resolution measurements, was emphasized. We show the development and achievement of an optical module which can be easily interfaced on the basic instrument, allowing small specular objects' observation. The results of deformation of electrically actuated MEMS are shown. Georges and Thizy: Photorefractive holographic camera for monitoring. . . Downloaded From: http://nanolithography.spiedigitallibrary.org/ on 08/20/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspxFig. 3 Scheme of the principle of the photorefractive holographic camera adapted to MEMS observation. Georges and Thizy: Photorefractive holographic camera for monitoring. . . Downloaded From: http://nanolithography.spiedigitallibrary.org/ on 08/20/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Georges and Thizy: Photorefractive holographic camera for monitoring. . . Downloaded From: http://nanolithography.spiedigitallibrary.org/ on 08/20/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Georges and Thizy: Photorefractive holographic camera for monitoring. . . Downloaded From: http://nanolithography.spiedigitallibrary.org/ on 08/20/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Georges and Thizy: Photorefractive holographic camera for monitoring. . . Downloaded From: http://nanolithography.spiedigitallibrary.org/ on 08/20/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Section: Basic Configuration: Photorefractivementioning

confidence: 99%

Section: Basic Configuration: Photorefractivementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photorefractive holographic camera for monitoring deformations of MEMS

Georges

Thizy

2015

J. Micro/Nanolith. MEMS MOEMS

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“…Such high temperature induces typically a few hundreds of microns deformation, In a previous paper [20] we already compared the measurement of large deformation with respect to holographic interferometry in visible with a photorefractive holographic camera [21] . The advantage of LWIR ESPI is that deformation can be measured which are larger by a factor of 20 when compared to visible holographic measurement.…”

Section: Thermo-mechanical Behavior Assessment Of Composite and Hybrimentioning

confidence: 99%

Speckle interferometry at 10 micrometers wavelength: a combined thermography and interferometry technique and its application in aeronautical nondestructive testing

et al. 2014

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Speckle interferometry with CO 2 laser (10 micrometers) and microbolometer array has been developed and the final outcome is a mobile interferometer. The long wavelength allows to measure large deformations and is well immune against external perturbations, so as it can be used in field conditions. The technique is based on specklegram recording on the microbolometer array. The background of the specklegram is constituted by the thermal image of the object. Consequently the technique allows simultaneous observation of deformation and temperature difference when an object undergoes a given stress. We show several applications in aerospace nondestructive testing.

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“…Thermo-elastic distortions have first been imposed on the selected hardware by local heating and then measured by a holographic camera (HC) using a BSO photorefractive crystal (PRC) as the recording medium [1], [2] . This instrument is based on real time holographic interferometry (HI).…”

Section: Introductionmentioning

confidence: 99%