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Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
Construction of a high-resolution moiré interferometer for investigating microstructural displacement fields in
H T Goldrein1, P J Rae, S J P Palmer
1Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK.
Summary
A novel moiré interferometer measures micro-scale displacements in materials. This technique visualizes deformation in polymer-bonded explosives (PBXs), aiding in validating computational models.
Area of Science:
- Materials Science
- Optical Metrology
- Mechanical Engineering
Background:
- Understanding material deformation at the microscale is crucial for accurate computational modeling.
- Polymer-bonded explosives (PBXs) exhibit complex mechanical behavior influenced by their heterogeneous microstructure.
- Existing methods may lack the resolution to precisely map displacement fields within these microstructures.
Purpose of the Study:
- To develop and demonstrate a high-magnification moiré interferometer for measuring local in-plane displacement fields.
- To visualize and analyze deformation behavior in polymer-bonded explosives (PBXs) at the microstructural level.
- To provide a validated experimental method for characterizing inhomogeneous materials.
Main Methods:
- Construction of a high-magnification moiré interferometer with 1-micrometer spatial resolution.
- Utilizing laser illumination, phase-stepping optics, and polarization-preserving optical fibers.
- Casting thin-phase gratings onto sample surfaces and coating with gold for enhanced fringe contrast.
- Integrating laser and white-light illumination for simultaneous displacement and microstructure visualization.
Main Results:
- Successful measurement of local in-plane displacement fields with high spatial resolution.
- Visualization of displacement fields in polymer-bonded explosives (PBXs) during deformation to failure.
- Demonstration of the instrument's capability to correlate microstructure with mechanical response.
Conclusions:
- The developed moiré interferometer is an effective tool for investigating microstructural effects on material deformation.
- This technique is vital for validating computational models of inhomogeneous materials like PBXs.
- Accurate measurement of displacement fields enhances the understanding of material failure mechanisms.
