Self-correlation fiber specklegram sensor using volume characteristics of speckle patterns

Gómez, Jorge; Salazar, Ángel

doi:10.1016/j.optlaseng.2012.01.002

Cited by 15 publications

(9 citation statements)

References 13 publications

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“…The multimode fiber (MMF) speckle pattern, consisting of many granular bright spots, is formed as a result of interference between the modes propagating within the optical fiber [1]. This MMF speckle field is sensitive to external perturbations, and therefore is excellent in measuring a number of parameters [2][3][4][5][6][7]. MMF speckle sensors offer many advantages such as large coupling tolerance, easy installation and implementation of low-cost optoelectronics [8].…”

Section: Introductionmentioning

confidence: 99%

“…The speckle field was sectioned into subimages corresponding to the filtering window sizes of a)16×16, b)32×32, c)64×64, d)128×128, e) 256×256, and f) 1024×1280. The signal waveforms with the largest Ipp were given for, a) sub-image(32,35), b) sub-image(18,18), c) sub-image (9,9), d) sub-image (5,5), e) sub-image(3,3), and f) the whole image. For each sectioning window, the total intensities of 1000 frames were firstly calculated to obtain the waveforms and the Ipp values.…”

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confidence: 99%

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Investigation on sensitivity enhancement for optical fiber speckle sensors

et al. 2016

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We present a detailed theoretical and experimental study on the sensitivity enhancement for multimode fiber (MMF) speckle sensor. Using mode coupling theory, we derive an expression showing that the sensitivity of the MMF speckle sensor depends on the intensity profile of the MMF modes. Particularly, we use our theory to study the influence of the spatial filtering window on the sensitivity, and the experimental results have found a good agreement with the theory. Our results suggest that the sensitivity of an MMF speckle sensor can be greatly enhanced by adjusting the size and location of the spatial filtering window. An 80-fold improvement on sensitivity was achieved in our experiment, as compared with the conventional MMF speckle sensor with the filtering window placed at the center of the speckle field.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Investigation on sensitivity enhancement for optical fiber speckle sensors

et al. 2016

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“…FSS have been widely studied by using holographic setups based on photorefractive materials [8][9][10][11][12][13], however, more recently, non-holographic fiber specklegram sensors for measuring several engineering parameters have been reported [14][15][16][17][18][19][20]. About non holographic techniques two possibilities have been reported.…”

Section: Introductionmentioning

confidence: 99%

Fiber specklegram sensors (FSS) for measuring high frequency mechanical perturbations

Hoyos¹,

Gómez²,

Gómez³

2013

SPIE Proceedings

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In this work, a technique for measuring high frequency micro-vibrations by using non holographic fiber specklegram sensor is experimentally demonstrated. In our setup, a laser source emitting at 632nm is coupled to a structure of Singlemode-Multimode-Singlemode fibers which produce a filtering effect that is used as optical transducer. Mechanical perturbations of controlled amplitude and frequency are applied to the Multimode fiber, which is fastened at the ends to induce vibrations. Perturbations higher than 3 KHz and below one micron are perfectly recovered by the system, which additionally, exhibits a linear response. Due to the low cost and the simplicity of the technique, it becomes an interesting method for the implementation of fiber sensors in a wide range of engineering applications.

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“…Los sensores FSS han sido ampliamente estudiados mediante arreglos holográficos cuyo medio de registro es un material foto refractivo [11][12][13][14][15][16], sin embargo, más recientemente, la importancia de este tipo de sistemas en esquemas no-holográficos ha sido explorada en la medición de múltiples parámetros de interés en ingeniería [17][18][19][20][21][22][23][24][25][26]. Alrededor de los arreglos no-holográficos, dos posibilidades han sido reportadas.…”

Section: Introductionunclassified

Temperature measurement by means of fiber specklegram sensors (FSS)

Castaño¹,

Gutiérrez²,

Quíjano³

et al. 2018

Opt. Pura Apl.

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In this work, a technique for temperature measurement using non-holographic fiber optic specklegrams is demonstrated experimentally. In the experimental scheme, a 632 nm laser source is coupled to a mono-multi-mono mode fiber arrangement, which produces a filtering effect that is used as an optical transduction mechanism. Thermal perturbations between 25 0 C and 60 0 C were applied to the fiber array, finding a linear response of the system and a sensitivity superior to the previously reported for studies in similar systems. Due to the low cost and simplicity of the technique, these results are of great interest for the implementation of this type of optical fiber sensors in a large number of engineering applications.

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Self-correlation fiber specklegram sensor using volume characteristics of speckle patterns

Cited by 15 publications

References 13 publications

Investigation on sensitivity enhancement for optical fiber speckle sensors

Investigation on sensitivity enhancement for optical fiber speckle sensors

Fiber specklegram sensors (FSS) for measuring high frequency mechanical perturbations

Temperature measurement by means of fiber specklegram sensors (FSS)

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