Dual in-plane electronic speckle pattern interferometry system with electro-optical switching and phase shifting

Area of Science:

• Optics and Photonics
• Materials Science
• Mechanical Engineering

Background:

• In situ measurements require stable and precise optical systems.
• Electronic Speckle Pattern Interferometry (ESPI) is a valuable technique for deformation analysis.
• Existing ESPI systems can be limited by mechanical stability and real-time measurement capabilities.

Purpose of the Study:

• To develop a dual in-plane electronic speckle pattern interferometry (ESPI) system for in situ measurements.
• To enhance mechanical stability and enable real-time measurements in perpendicular planes.
• To describe the optical setup and operational principles of the novel ESPI system.

Main Methods:

• Utilized an electro-optical switch based on a liquid-crystal device to control illumination polarization for x and y sensitivity.
• Incorporated two additional liquid-crystal devices for phase shifting.
• Developed advanced software for quasi real-time switching between perpendicular measurement planes.
• Designed the system with no moving parts to ensure mechanical stability.

Main Results:

• Successfully developed and described a dual in-plane ESPI system.
• Demonstrated the capability for in situ measurements with sensitivity in both x and y directions.
• Achieved quasi real-time switching between measurement planes.
• The system's lack of moving parts ensures high mechanical stability.

Conclusions:

• The developed dual in-plane ESPI system offers a mechanically stable and efficient solution for in situ measurements.
• The use of liquid-crystal devices for switching and phase shifting allows for advanced control and real-time operation.
• This system represents a significant advancement for applications requiring precise deformation analysis.