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Updated: Mar 3, 2026

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

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

Published on: July 5, 2016

Digital holographic photoelasticity.

C S Narayanamurthy, Giancarlo Pedrini, Wolfgang Osten

|May 3, 2017

Summary

Digital holography enables whole-field analysis of stressed photoelastic materials by studying isochromatic and isopachic fringes and their phases.

Area of Science:

Optics and Photonics
Solid Mechanics
Materials Science

Background:

Photoelasticity is a method used to determine stress distributions in materials.
Traditional methods can be time-consuming and provide limited spatial information.
Digital holography offers potential for advanced optical metrology.

Purpose of the Study:

To introduce and validate a novel digital holography technique for photoelastic analysis.
To enable whole-field measurement of isochromatic and isopachic fringe phases.
To demonstrate comprehensive analysis of stressed photoelastic materials.

Main Methods:

Utilizing digital holography to capture and reconstruct holographic data.
Analyzing isochromatic and isopachic fringe patterns and their phase information.

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Performing detailed theoretical and experimental validation of the technique.

Main Results:

Successful whole-field analysis of stressed photoelastic materials was achieved.
The technique accurately captures fringe patterns and their respective phases.
Demonstrated the capability to analyze every section of stressed materials.

Conclusions:

The developed digital holography method provides a powerful tool for photoelastic stress analysis.
This technique allows for detailed, non-destructive, whole-field evaluation of material stress.
Offers significant advancements in the study of stressed photoelastic materials.