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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
Published on: July 5, 2016
Detection of microbubble position by a digital hologram
Shin-ichi Satake1, Yukihiro Yonemoto, Tadashi Kikuchi
1Department of Applied Electronics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan. satake@te.noda.tus.ac.jp
Applied Optics
|November 17, 2011
Summary
This study introduces a novel method for precisely measuring microbubble 3D positions in real-time. The technique utilizes micro digital holographic particle tracking velocimetry, offering high time-resolution for accurate bubble tracking.
Area of Science:
- Fluid dynamics
- Optical metrology
- Microparticle analysis
Background:
- Accurate measurement of microbubble dynamics is crucial in various scientific fields.
- Existing techniques may lack the required time-resolution or spatial accuracy for 3D microbubble tracking.
Purpose of the Study:
- To develop and validate a new high time-resolution technique for three-dimensional microbubble position measurement.
- To establish a method based on micro digital holographic particle tracking velocimetry.
Main Methods:
- Utilizing micro digital holographic particle tracking velocimetry to capture holographic images of microbubbles.
- Constructing an intensity profile from holographic images, identifying two peaks related to bubble size.
- Determining 3D position from peak centers and the focused bubble image center.
- Theoretically modeling the intensity profile using light refraction and a ring-shaped aperture model.
Main Results:
- The developed technique enables high time-resolution measurements of microbubble positions in three dimensions.
- Experimental results show a correlation between the distance of intensity profile peaks and microbubble diameter.
- Theoretical intensity profile calculations closely match experimental findings.
Conclusions:
- The novel micro digital holographic particle tracking velocimetry technique provides accurate and high time-resolution 3D microbubble positioning.
- The method is validated through good agreement between theoretical predictions and experimental measurements.
- This technique offers a promising tool for studying microbubble behavior in dynamic systems.
