Statistics of the dynamic speckle produced by a rotating diffuser and its application to the assessment of paint drying

Romero, Gladis Graciela; Alanís, Elvio; Rabal, H.

doi:10.1117/1.602542

Cited by 41 publications

(12 citation statements)

References 9 publications

(7 reference statements)

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“…We believe that there may exist a statistical mapping between the summations in Eqs. (17) and (18), but probably such mapping exists only for this case where the samples are ordered and each value of the sequence appears in w 1 different samples (except the values at the beginning and at the end of the sequence). Such statistical mapping is out of the scope of this paper, but we think it could be subject of future work, since the summation of summations of absolute values on running windows is used in other image processing analysis problems such as image compression quality analysis [21].…”

Section: Weighted Generalized Differences (Wgds)mentioning

confidence: 98%

“…8) could only be explained by a deeper study of the statistical mapping between Eqs. (17) and (18). The behavior of MWD and MWD 0 for w 4 or w 20 strongly depends on the characteristic of data obtained by the experiment.…”

Section: Weighted Generalized Differences (Wgds)mentioning

confidence: 98%

“…(18)] presents similar behavior to the summation of n summations of w 1 absolute values of integer terms [Eq. (17)]. This means that the visual subject evaluation of the result given by Eq.…”

Section: Weighted Generalized Differences (Wgds)mentioning

confidence: 99%

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Alternative measures for biospeckle image analysis

et al. 2012

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Biospeckle is a technique whose purpose is to observe and study the underlying activity of some material. It has its roots in optical physics, and its first step is an image acquisition process that produces a video sequence of the reflection of a laser. The video content can be analyzed to have an interpretation of the activity of the observed material. The literature on this subject presents several different measures for analyzing the video sequence. Three of the most popular measures are the generalized difference (GD), the weighted generalized difference (WGD), and Fujii's method. These measures have drawbacks such as high computation time or limited visual quality of the results. In this paper, we propose (i) an alternative O(n) algorithm for the computation of the GD, (ii) an alternative measure based on the GD, (iii) an alternative measure based on the WGD, and (iv) a generalized definition of the Fujii's method with better visual quality. We discuss the similarities between the new measures and the existent ones, showing when they are applicable. We prove the gain in time computation. The proposed measures will help researchers to gain time during their research and to be able to develop faster tools based on biospeckle application.

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Section: Weighted Generalized Differences (Wgds)mentioning

confidence: 98%

Section: Weighted Generalized Differences (Wgds)mentioning

confidence: 98%

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Alternative measures for biospeckle image analysis

et al. 2012

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“…6 shows Fourier transform spectrum for the laser output signal. To assign the bandwidth variation of transform, the MSF of the spectra is introduced and can be written as [9] i…”

Section: Theory Anlysismentioning

confidence: 99%

<title>Speckle feedback-injected erbium-doped fiber ring laser for velocity detecting</title>

2007

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A new approach for velocity detecting based on laser speckle feedback injected erbium-doped fiber (EDF) ring laser is presented in this paper. 1550nm wavelength light is outgone through an optical fiber and shoots onto a moving object by a lens. Portion of the light scattered from the object produces dynamic speckle, when it is back-coupled into the same fiber and injects the EDF ring laser, random intensity feedback causes changes of both intensity and frequency of the laser. We theoretically analyzed the laser output when speckle feedback injects an EDF ring laser by using model of the injection-seeded EDF ring laser, and experimentally obtained the dynamic speckle-modulated laser output signal by a photodiode (PD). The signal is analyzed by way of FFT analysis, and the mean speckle frequency (MSF), which is defined as the ratio of number of fluctuations in the detected signal to the measurement time, is obtained. We studied the relationship between the velocities and MSFs by changing the velocity of object, thus a linear dependent relationship between them is obtained, which indicates that speckle feedback injected EDF ring laser is an effective approach for velocity detecting, it is promising to develop a new generation of optical fiber active sensor.

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“…Speckle activity has been extensively studied and as results of several research projects in Optics a wide variety of parameters and methodologies for measuring the activity of such kind of speckle patterns have been proposed. In literature a wide range of applications are reported, from industrial applications like paint drying monitoring [1][2][3] to physiological activity of living objects such as blood flow, heartbeat, viability of seeds, maturity and bruising in fruits among others [4][5][6][7][8][9][10]. The metrological uses of dynamic speckle well consolidated by systematic testing of all the approaches arising by the many applications [11] suggest that it can be used as a tool for monitoring cultivation of microalgae in laboratory scale photobioreactor.…”

Section: Introductionmentioning

confidence: 99%

Bio-speckle for microalgae growth monitoring in laboratory scale photobioreactor

Romero¹,

Monaldi²,

Domínguez³

et al. 2017

Opt. Pura Apl.

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ABSTRACT:Microalgae are widely used in different industries -pharmaceutical, cosmetic, in those dealing with pollution prevention, aquaculture and especially biofuels. Because of the wide range of use, there is an active interest in microalgae large-scale cultivation. Standard techniques for algae biomass production requires cultivation in nutritious culture media, and well-defined external parameters, such as controlled conditions of light intensity, temperature and aeration gas. Commercial production of microalgae is expensive, and the addition of nutrients in culture media contributes to its high cost. The evaluation of the quality of culture media using wastewater effluents or agro-industrial waste can be a way to reduce algal cultures costs. This research aims to develop a noninvasive method for the testing of effectiveness of agro-industrial waste, previously treated, as culture media through daily monitoring of population increase microalgae. We found that it is possible to detect the growth of the microorganisms by using statistical cumulants as numerical approaches for analyzing the dynamic speckle patterns produced by samples of Chrorella Vulgaris algae cultivated in bold basal culture medium.Key words: Biospleckle, microalgae growing, speckle activity, autocorrelation function, optical density. RESUMEN:Las microalgas, son ampliamente utilizadas en las industrias farmacéutica, cosmética, en aquellas relacionadas con la prevención de contaminación, acuacultura y especialmente en biocombustibles. Debido a su amplio rango de aplicaciones existe un gran interés en el cultivo de microalgas a gran escala. Las técnicas estándar para la producción de biomasa algal requieren de su cultivo en medios nutritivos y parámetros externos bien definidos tales como condiciones controladas de iluminación, temperatura y aireación. La producción comercial de microalgas es costosa y la adición de nutrientes a los medios de cultivos contribuye a aumentar el costo. La evaluación de la calidad de medios de cultivos usando aguas residuales o residuos agroindustriales puede resultar en una vía para reducir costos. Este trabajo tiene por objetivo el desarrollo de un método no invasivo para monitorear la eficiencia de residuos agroindustriales, previamente tratados, como posibles medios de cultivos a través del monitoreo diario del crecimiento poblacional de las microalgas. Hemos encontrado que es posible detectar el crecimiento de los microorganismos usando cumulantes estadísticos como una aproximación numérica para analizar la actividad de patrones de speckle dinámico producidos por muestras de algas Chrorella Vulgaris cultivadas en medio basal Bold.Palabras clave: Biospleckle, crecimiento de microalgas, actividad de speckle, función de autocorrelación, densidad óptica. REFERENCES AND LINKS / REFERENCIAS Y ENLACES[1] H. Rabal, M. Trivi, R. Arizaga, N. Cap, G.Romero, E. Alanís, "Transient phenomena analysis using dynamics speckle patterns," Opt. Eng. 38(1), 57-62 (1996).https://doi.org/10.1117/1.600789[2] G. Romero, E. Alanís, H...

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Statistics of the dynamic speckle produced by a rotating diffuser and its application to the assessment of paint drying

Cited by 41 publications

References 9 publications

Alternative measures for biospeckle image analysis

Alternative measures for biospeckle image analysis

<title>Speckle feedback-injected erbium-doped fiber ring laser for velocity detecting</title>

Bio-speckle for microalgae growth monitoring in laboratory scale photobioreactor

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