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Related Experiment Video

Updated: Jun 16, 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

Sandwich hologram interferometry. 3:Contouring.

|February 16, 2010

Summary

This summary is machine-generated.

A novel holographic contouring technique uses dual shearing during recording and reconstruction to create interference fringes. This method enables precise 3D object measurement and analysis of cross-sections in any orientation.

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Area of Science:

Optics and Photonics
Metrology

Background:

Holographic interferometry is a powerful tool for non-contact measurement.
Existing methods may have limitations in analyzing complex 3D shapes and orientations.

Purpose of the Study:

To introduce a new holographic contouring method.
To enable precise 3D object measurement and analysis of cross-sections.

Main Methods:

The method employs illumination shearing during holographic recording.
Observation shearing is used during reconstruction.
Two holographic plates are processed and bonded to form a sandwich hologram.

Main Results:

Contouring fringes are generated representing object intersections with interference surfaces.
Tilting the hologram allows for evaluation of object slant (sign, direction, magnitude).
Cross-sections can be studied in any random orientation.

Conclusions:

This holographic contouring method offers versatile 3D measurement capabilities.
The technique is valuable for both quantitative measurement and demonstration purposes.