Sub-micrometer precision of optical imaging to locate the free surface of a micrometer fluid shape

Montanero, J. M.; Vega, E. J.; Ferrera, C.

doi:10.1016/j.jcis.2009.07.051

Cited by 9 publications

(7 citation statements)

References 13 publications

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“…Advanced image processing techniques have been designed to locate precisely the contours delimiting the objects in this type of images. They provide results with sub-pixel accuracy when processing images of drops [20][21][22], bubbles [23,24], liquid bridges [25,26], liquid films [27,28] and liquid lenses [29], among others. In the present work, we used an image processing technique recently proposed to locate the free surface enclosing liquid shapes of tens of micrometers in size [28,32].…”

Section: Image Processing Techniquementioning

confidence: 99%

“…They provide results with sub-pixel accuracy when processing images of drops [20][21][22], bubbles [23,24], liquid bridges [25,26], liquid films [27,28] and liquid lenses [29], among others. In the present work, we used an image processing technique recently proposed to locate the free surface enclosing liquid shapes of tens of micrometers in size [28,32]. This technique is capable of 'restoring' blurred edges to partially overcome limitations due, for instance, to diffraction or lack of focus.…”

Section: Image Processing Techniquementioning

confidence: 99%

“…Advanced image processing techniques locate the contours delimiting the object with sub-pixel accuracy. The conjunction of optical imaging and advanced image processing techniques has yielded very precise results when analyzing the shape and interfacial properties of drops [20][21][22], bubbles [23,24], liquid bridges [25,26], liquid films [27,28] and liquid lenses [29], among others. In the present work, we show that this methodology, appropriately adapted to measuring the 3D shape of glass micro-nozzles, provides precise results for nozzle sizes down to a few microns.…”

Section: Introductionmentioning

confidence: 99%

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Micrometer glass nozzles for flow focusing

Montanero

Gañán‐Calvo

Acero

et al. 2010

J. Micromech. Microeng.

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We discuss the use of flame-shaped glass micro-nozzles for ultra-fine liquid atomization by flow focusing (DePonte et al 2008 J. Phys. D: Appl. Phys. 41 195505), which may have great importance in very varied technological fields, such as biotechnology, biomedicine and analytical chemistry. Some advantages offered by these nozzles over the original plate orifice configuration (Gañán-Calvo 1998 Phys. Rev. Lett. 80 285) are: (i) they are extraordinarily smooth even at the micrometer scale, (ii) one can readily obtain nozzles with neck diameters in the range of a few tens of microns, (iii) they demand gas flow rates significantly smaller than those required by the plate orifice configuration and (iv) they are transparent. However, highly demanding applications require a precise characterization of their three-dimensional shape by non-destructive means. This characterization cannot be obtained straightforwardly from optical transmission or electron microscopy mainly due to optical distortion. We propose in this paper a method for measuring the shape and size of micrometer nozzles formed inside millimetric and submillimetric capillaries made of transparent materials. The inside of the capillary is colored, and the capillary is put in a liquid bath with almost the same refractive index as that of the capillary to eliminate optical distortion. The nozzle image, acquired with a microscope using back-light illumination to get a silhouette effect, is processed to locate the contours of the nozzle with sub-pixel resolution. To determine the three-dimensional shape of the nozzle, the capillary is rotated in front of the camera. The method provides precise results for nozzle sizes down to a few microns.

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Section: Image Processing Techniquementioning

confidence: 99%

Section: Image Processing Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micrometer glass nozzles for flow focusing

Montanero

Gañán‐Calvo

Acero

et al. 2010

J. Micromech. Microeng.

View full text Add to dashboard Cite

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“…They could detect oscillation amplitudes 20 times smaller than one pixel (80 nm for the objective they use: 1.6m/pixel). During the same year Montanero, Vega and Ferrera reported a study about the micrometer deformation of a milli-metric liquid bridge, a liquid film of hexadecane deposited on a rod with an anti vibration isolation system [5]. They evaluated the standard deviation in the contour eccentricity to 50 nm and they attributed this the uncertainty associated to the image processing technique.…”

Section: Introductionmentioning

confidence: 99%

Wide band Fresnel super-resolution applied to capillary breakup of viscoelastic fluids

et al. 2013

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We report a technique based on Fresnel diffraction with white illumination that permits the resolution of capillary surface patterns of less than 100 nanometers. We investigate Rayleigh Plateaux like instability on a viscoelastic capillary bridge and show that we can overcome the resolution limit of optical microscopy. The viscoelastic filaments are approximately 20 microns thick at the end of the thinning process when the instability sets in. The wavy distortions grow exponentially in time and the pattern is resolved by an image treatment that is based on an approximation of the measured rising flank of the first Fresnel peak.

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“…Non-standard image processing techniques are to be used in order to get reliable results, especially for small-amplitude perturbations. Super-resolution methods for free surface detection have been sucesfully applied to both equilibrium [9,10] and dynamic [11,12] liquid shapes by using backlight illumination. In the present paper, we describe an experimental method to produce micrometer electrically charged jets (Sec.…”

Section: Introductionmentioning

confidence: 99%