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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
Published on: July 5, 2016
Surpassing digital holography limits by lensless object scanning holography
Vicente Micó1, Carlos Ferreira, Javier García
1Departamento de Óptica, Universidad de Valencia, C/ Doctor Moliner 50, 46100 Burjassot, Spain. vicente.mico@uv.es
Optics Express
|April 27, 2012
Summary
Lensless object scanning holography (LOSH) enhances digital holography image quality without lenses. This method improves resolution, field of view, signal-to-noise ratio, and depth of field using digital post-processing.
Area of Science:
- Optics and Photonics
- Digital Imaging
- Holography
Background:
- Digital Fourier holography often requires complex optical setups.
- Improving image quality metrics like resolution and signal-to-noise ratio (SNR) is crucial for practical applications.
Purpose of the Study:
- To introduce lensless object scanning holography (LOSH) as a simplified, lensless method for enhancing reflective digital holography.
- To demonstrate significant improvements in image resolution, field of view (FOV), SNR, and depth of field (DOF).
Main Methods:
- Recording multiple digital lensless holograms of a moving object.
- Utilizing digital post-processing to reconstruct a synthetic image.
- Generating a synthetic aperture (SA) through object scanning for superresolution (SR).
- Employing speckle suppression and artifact averaging for SNR enhancement.
- Implementing digital refocusing for DOF extension.
Main Results:
- Achieved superresolution (SR) through synthetic aperture (SA) generation via object scanning.
- Expanded the object field of view (FOV) using the same scanning principle.
- Enhanced signal-to-noise ratio (SNR) by suppressing speckles and averaging coherent artifacts.
- Extended depth of field (DOF) through digital refocusing.
- Demonstrated impressive image quality improvements on a 1D reflective resolution test target.
Conclusions:
- LOSH offers a fully lensless approach to significantly improve holographic image quality.
- The simplified experimental setup and digital post-processing make LOSH a promising technique for various imaging applications.
- LOSH effectively addresses limitations in resolution, FOV, SNR, and DOF in digital holography.
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