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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

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Three-dimensional illumination system using dielectric liquid lenses.

Yen-Sheng Lu¹, Ling-Yu Tsai, Kuo-Cheng Huang

¹Institute of Electronics Engineering, National Tsing Hua University, Hsinchu, Taiwan.

|July 13, 2011

Summary

A novel 25-pixel illumination system uses dielectric liquid-lenses (DLL) and LEDs for 3D light field control. This system achieves high accuracy in simulations and corrects distorted light patterns, demonstrating its practical application.

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Determining 3D Flow Fields via Multi-camera Light Field Imaging

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Published on: March 6, 2013

Area of Science:

Optics and Photonics
Illumination Systems Engineering

Background:

Traditional illumination systems lack dynamic 3D light field control.
Achieving precise control over light intensity and direction is crucial for advanced display and imaging applications.

Purpose of the Study:

To develop and validate a novel 25-pixel illumination system capable of 3D light field manipulation.
To demonstrate the system's ability to adjust illuminance dynamically and correct optical distortions.

Main Methods:

A 5x5 dielectric liquid-lens (DLL) zoom module array was integrated with 25 light-emission diodes (LEDs) and secondary optics.
LEDs served as 2D illumination pixels, with DLLs providing longitudinal illuminance adjustability.
Experimental and simulation results were compared using normalized cross-correlation (NCC).

Main Results:

The system successfully demonstrated 3D light field manipulation.
A normalized cross-correlation (NCC) greater than 0.8 was achieved between experimental and simulation results, validating the system design.
The system effectively corrected distorted light patterns on a tilted screen and performed light compensation for objects at different distances.

Conclusions:

The developed 25-pixel illumination system offers a feasible solution for dynamic 3D light field control.
The system's ability to correct distortions and compensate for distance-based light variations highlights its potential for practical applications in displays and imaging.