An electro-optical read-out system for analysis of speckle photographs

Kaufmann, Guillermo H.; Ennos, A. E.; Gale, B.; Pugh, D. J.

doi:10.1088/0022-3735/13/5/027

Cited by 60 publications

(12 citation statements)

References 5 publications

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“…Interrogating the fringes involves determining their orientation and their spacing. Numerous one-dimensional techniques have been proposed (cf Meynart 1983c, Kaufman et al 1980, Ineichen et al 1980, Lourenco & Krothapalli 1988. These methods form one-dimensional samples, either by sampling along lines across the fringe pattern or by compressing the two-dimensional Young's fringe pattern into a one-dimensional array using cylindrical lenses or integration.…”

Section: Interrogation Techniquesmentioning

confidence: 99%

Particle-Imaging Techniques for Experimental Fluid Mechanics

Adrian¹

1991

Annu. Rev. Fluid Mech.

2,736

825

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Section: Interrogation Techniquesmentioning

confidence: 99%

Particle-Imaging Techniques for Experimental Fluid Mechanics

Adrian¹

1991

Annu. Rev. Fluid Mech.

2,736

825

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“…RAGING. -Recently, digital processing systems have been proposed for speckle photography in solid mechanics [3,4,5,6]. In these methods, a mechanical (or electronic) rotation aligns the fringes parallel to the columns of the acquisition system.…”

Section: Methods 1 : Image Processing By 1-d Ave-mentioning

confidence: 99%

Convective flow field measurement by speckle velocimetry

Meynart

1982

Rev. Phys. Appl. (Paris)

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A 2-D velocity map in a cylindrical Rayleigh-Bénard flow is determined by means of a speckle photography technique. Automatic velocity measurements are performed by two different methods : (i) Isovelocity contours are drawn by spatial filtering; (ii) Local illumination by a laser beam produces Young's fringes which are analysed by an image processing system. New methods are proposed for digital analysis of the speckle fringes

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“…Dado que ∆Φ o−e (y, z) permanece constante, si recuperamos la fase de cada uno deéstos podremos hallar el término de fase que varía entre las distintas capturas. Debido a que en cada interferograma las franjas pueden considerarse verticales en un intervalo pequeño, tomaremos una región sobre la cual promediaremos todas las filas para obtener una señal de intensidad I i (z) [15] (Fig. 4) que puede expresarse como:…”

Section: Recuperación De Faseunclassified

Interferómetro de polarización para la caracterización mecánica de dispositivos piezoeléctricos

Riobó

Alvarez

Garea

et al. 2014

2014 IEEE Biennial Congress of Argentina (ARGENCON)

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Piezoelectric devices are critical components in many different fields. They are often used as ultrasonic transducers, micro/nano positioners, and actuators. Electrical characterization of these devices can be performed by means of very well known techniques focused mainly on impedance measurements at different frequencies. However, since the measurement of mechanical properties corresponds to the determination of very small displacements, an optical interferometer is required. In this work, we propose the use of two coupled polarization interferometers for measuring the displacement of a mirror mounted in a piezoelectric device. The first one corresponds to a Michelson type interferometer with two orthogonally polarized branches. One of them is set as a reference, and the other changes its length as the piezoelectric under test is excited. Instead of forcing the interference of both branches with an analyzer, both signals are entered to a second polarization interferometer. This second interferometer consists mainly of a single birefringent crystal plate that provides a spatial interferogram. According to the phase change between reference and test signals, there is a uniform phase added to all of the points of the interferogram. We take advantage of this feature and of the stability of this second interferometer to recover the phase and the displacement of the mirror by means of very well known phase recovery methods.Resumen-Los dispositivos piezoeléctricos son componentes críticos en diversos campos. A menudo son usados como transductores ultrasónicos, micro/nano posicionadores y actuadores. La caracterización eléctrica de tales dispositivos puede ser realizada a través de diversas técnicas enfocadas primordialmente en la determinación de la impedancia a diferentes frecuencias. Sin embargo, la determinación de las propiedades mecánicas en general está asociada a la medición de desplazamientos muy pequeños. Por este motivo, se requiere un interferómetroóptico para realizar tales medidas. En este trabajo, proponemos el uso de dos interferómetros de polarización acoplados para medir el desplazamiento de un espejo montado en un dispositivo piezoeléctrico. El primero corresponde a un interferómetro de tipo Michelson con dos ramas polarizadas ortogonalmente. Una de ellas es tomada como referencia, mientras que la otra rama cambia su longitud acorde a la excitación que recibe el piezoeléctrico bajo estudio. Luego, en lugar de forzar la interferencia de las ramas utilizando un simple analizador, se interpone un segundo interferómetro de polarización. Este segundo interferómetro consiste principalmente en unaúnica lámina de cristal birrefringente que provee un interferograma espacial. Acorde al cambio de fase entre las ramas de referencia y de prueba, hay una fase uniforme añadida en todos los puntos del interferograma. De este modo, aprovechando tanto esta característica como la estabilidad del segundo interferómetro, podemos recuperar la fase y, consecuentemente, el desplazamiento del espejo por medio de métodos de r...

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An electro-optical read-out system for analysis of speckle photographs

Cited by 60 publications

References 5 publications

Particle-Imaging Techniques for Experimental Fluid Mechanics

Particle-Imaging Techniques for Experimental Fluid Mechanics

Convective flow field measurement by speckle velocimetry

Interferómetro de polarización para la caracterización mecánica de dispositivos piezoeléctricos

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An electro-optical read-out system for analysis of speckle photographs

Cited by 60 publications

References 5 publications

Particle-Imaging Techniques for Experimental Fluid Mechanics

Particle-Imaging Techniques for Experimental Fluid Mechanics

Convective flow field measurement by speckle velocimetry

Interfer&#x00F3;metro de polarizaci&#x00F3;n para la caracterizaci&#x00F3;n mec&#x00E1;nica de dispositivos piezoel&#x00E9;ctricos

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Interferómetro de polarización para la caracterización mecánica de dispositivos piezoeléctricos