-Instrument Introduction

This experiment includes two parts: laser speckle photography and electronic speckle interferometry. The use of secondary exposure speckle patterns for testing the in-plane displacement field of object surfaces, as well as the strain, stress field testing, distance, velocity testing, internal defect and vibration analysis derived from it, is a promising application area for speckle effects. Using electronic speckle pattern interferometry to measure the out of plane displacement of objects, and comparing traditional dry plate exposure and computer graphics processing methods to deepen the understanding of speckle pattern interferometry.

-Experimental content

1. Understand the principle of laser speckle photography

2. Understand the principle of electronic speckle pattern interferometry

3. Learn two experimental procedures and compare them