Measurement of droplet velocity, size and refractive index using the pulse displacement technique

Lin, Shaofeng; Waterman, D R; Lettington, Alan H.

doi:10.1088/0957-0233/11/6/101

Cited by 22 publications

(18 citation statements)

References 5 publications

(7 reference statements)

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“…By replacing the Fourier transform according to Eq. (14) in Eq. (13), the template PðxÞ is expressed as:…”

Section: A Discussion On the Length And Number Of Analysis Windowsmentioning

confidence: 99%

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On discriminating sizes of CFD generated bubbles with signal processing analysis

Khan

Montes

Valencia

et al. 2015

International Journal of Heat and Mass Transfer

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“…By replacing the Fourier transform according to Eq. (14) in Eq. (13), the template PðxÞ is expressed as:…”

Section: A Discussion On the Length And Number Of Analysis Windowsmentioning

confidence: 99%

“…Lin et al [14] used three parallel planes of laser light between two photo detectors to measure the refractive index, size and velocity of the bubbles. The detectors record multiple refracted (and reflected) beams to estimate the parameters as the bubbles pass through.…”

Section: Introductionmentioning

confidence: 99%

On discriminating sizes of CFD generated bubbles with signal processing analysis

Khan

Montes

Valencia

et al. 2015

International Journal of Heat and Mass Transfer

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“…Lin et al [3] used three parallel planes of laser light between two photo detectors and proposed a pulse displacement method to make measurements of refractive index, size and velocity of bubbles. The detectors sense multiple refracted (and reflected) beams as the bubbles travel.…”

Section: Introductionmentioning

confidence: 99%

On Bubble Sizing in Water by Ultrasound

Hussein

Essmat

Yoma

2017

Int. J. Interact. Mob. Technol.

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Abstract-Classifying bubbles in liquids is a crucial problem that is demanded within multiple fields. This paper discusses a new method for classifying bubble sizes in non-contact and inexpensive approach using ultrasound analysis. Exploiting the principle of buoyancy, free rising bubbles with larger volumes elevate faster to the surface compared to the smaller ones, given that they have the same densities. An envelope detector is proposed which tracks the changes in the ultrasound signals reflected by the bubbles when they cross the ultrasound field. These changes in the reflected signals are distinctive for the sizes under consideration. Relevant spectral and linear predictive coding features that represent the distinct characteristics are extracted. These features are fed to a feed-forward artificial neural network to successfully classify air bubbles according to their sizes with an accuracy of 98.8%. This method provides promising applications to be implemented in industrial, biomedical and environmental fields.

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“…They called this technique the pulse displacement technique. Lin et al [4] also worked in forward scatter and employed three illuminating light sheets, extending the measurement capability to include relative refractive index. In Damaschke et al [5] and Albrecht et al [6] configurations suitable for backscatter detection were introduced, enabling more compact optical arrangements and easier optical access to the measurement position, while simultaneously making it possible to obtain the size and refractive index using only one illuminating beam.…”

Section: Introductionmentioning

confidence: 99%

Time-shift technique for simultaneous measurement of size, velocity, and relative refractive index of transparent droplets or particles in a flow

Schäfer

Tropea

2014

Appl. Opt.

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The time-shift technique, also known as the pulsed-displacement technique, is revisited as a method to measure size, velocity, and relative refractive index of spherical, transparent particles. Building on the basic measurement principle, we introduce several new innovations, making the technique significantly more attractive for use outside of the laboratory. These innovations include two possibilities for velocity measurement, validation criteria for one- and two-detector arrangements, and approaches to achieve higher bandwidths, and, in particular, lower measurable sizes. We discuss numerous optical configuration examples to illustrate the flexibility of this technique to meet various application requirements.

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Measurement of droplet velocity, size and refractive index using the pulse displacement technique

Cited by 22 publications

References 5 publications

On discriminating sizes of CFD generated bubbles with signal processing analysis

On discriminating sizes of CFD generated bubbles with signal processing analysis

On Bubble Sizing in Water by Ultrasound

Time-shift technique for simultaneous measurement of size, velocity, and relative refractive index of transparent droplets or particles in a flow

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