- Instrument Introduction
This experiment consists of two parts: laser speckle imaging and electronic speckle interferometry. The use of double-exposed speckle patterns to measure in-plane displacement fields on object surfaces, as well as the resulting applications for strain and stress field measurements, distance and velocity measurements, and the analysis of internal defects and vibrations in objects, represent promising areas of application for the speckle effect. This experiment utilizes electron speckle interferometry to measure out-of-plane displacement of an object, while comparing traditional film exposure with computer graphics processing to deepen understanding of speckle interferometry.
- Experiment Objectives
1. Understand the principles of laser speckle photography
2. Understand the principles of electron speckle interferometry
3. Learn and compare the two experimental procedures