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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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A customizable digital holographic microscope.

Claudia Ravasio1, Luca Teruzzi2, Mirko Siano2

  • 1Earth and Environmental Sciences Department, University of Milano-Bicocca, Milan, Italy.

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|September 10, 2024
PubMed
Summary
This summary is machine-generated.

We developed a low-cost holographic microscope for analyzing tiny particles in liquids. This portable system offers high-resolution imaging with an extended depth of field, useful for environmental particle characterization.

Keywords:
Digital holographyIce coresMicroscopyMineral dustOptics

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Environmental Science

Background:

  • Micrometric particle characterization is crucial for various scientific fields.
  • Traditional microscopy methods often lack sufficient depth of field or portability.
  • Holographic microscopy offers potential for advanced particle analysis.

Purpose of the Study:

  • To develop a compact, portable, and low-cost holographic microscope.
  • To enable detailed characterization of micrometric particles in liquid suspensions.
  • To demonstrate the system's applicability to environmental samples like ice cores.

Main Methods:

  • Modification of a commercial optical microscope with a collimated laser beam.
  • Integration of a quartz flow cell with a 3D-printed mount.
  • Holographic imaging of particle electromagnetic fields and subsequent image processing.
  • Remote system control for data processing.

Main Results:

  • Achieved near-optical microscope resolution with an enhanced depth of field.
  • Successfully extracted morphological and optical features (projected section, aspect ratio, extinction cross-section).
  • Validated the methodology using calibrated particles and applied it to Alpine ice core samples.

Conclusions:

  • The developed holographic microscope is a cost-effective and portable solution for particle characterization.
  • The system provides rich data on particle morphology and optical properties.
  • This technique is well-suited for analyzing airborne particles in environmental matrices such as snow, firn, and ice.