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Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique
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Characterizing ultrasonic standing wave fields by Schlieren imaging.

Frederike S L Wörtche1, Fabian Maucher1, Martijn Mooiweer1

  • 1Department of Precision and Microsystems Engineering, Delft University of Technology, Mekelweg 2, 2628 CD, Delft, The Netherlands.

Ultrasonics
|July 11, 2025
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Summary

This study introduces a new method for quantitative analysis of ultrasound pressure fields using schlieren imaging. The technique removes nonlinearities, enabling precise monitoring for acoustic levitation applications.

Keywords:
Acoustic levitationAcousto-opticsSchlierenStanding wavesUltrasonic phased arrays

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Area of Science:

  • Optical Physics
  • Acoustics

Background:

  • Schlieren imaging visualizes refractive index changes in transparent media.
  • Acoustic levitation utilizes ultrasound pressure fields.
  • Current schlieren imaging has a nonlinear intensity-pressure relationship, hindering quantitative analysis.

Purpose of the Study:

  • To develop a method for quantitative analysis of ultrasound pressure fields in acoustic levitation.
  • To overcome the nonlinear relationship between schlieren intensity and pressure fields.
  • To enable real-time monitoring and optimization of acoustic levitation systems.

Main Methods:

  • Phase-shifted stroboscopic schlieren imaging was employed.
  • The harmonic nature of the ultrasound pressure field was exploited.
  • A method was developed to extract the linear component of schlieren intensity, proportional to the pressure gradient.

Main Results:

  • The proposed method successfully removes the nonlinear relationship in schlieren imaging.
  • Quantitative analysis of pressure variations in acoustic levitation fields is now feasible.
  • Experimental results were validated against simulated acoustic levitation fields.

Conclusions:

  • The developed method provides a quantitative approach to analyzing schlieren images.
  • This technique is easily implemented and suitable for ultrasound pressure field analysis in acoustic levitation.
  • Improved monitoring and optimization of acoustic levitation are facilitated by this advancement.