Comparative digital holography

Area of Science:

• Optics
• Metrology
• Digital Imaging

Background:

• Traditional methods for comparing object shapes and deformations often require samples to be in the same physical location.
• Incoherent techniques like inverse fringe projection have limitations in flexibility and remote application.

Purpose of the Study:

• To develop a novel method for direct holographic comparison of object shape or deformation.
• To enable comparison of objects that are not co-located.
• To leverage digital holography for remote optical information transfer.

Main Methods:

• A coherent mask is generated using digital holography from a master object.
• This coherent mask is imaged onto a sample object with a different microstructure.
• Digital master holograms are transmitted via broadband digital telecommunication networks.

Main Results:

• The method allows for direct holographic comparison of shape or deformation between two objects.
• It eliminates the need for co-location of the master and sample objects.
• Complete optical information of the master object can be accessed remotely.

Conclusions:

• This digital holographic approach offers a flexible and remote solution for comparative metrology.
• The technique facilitates the comparison of object shapes and deformations across different locations.
• Broadband telecommunication networks enable efficient transmission of holographic data for remote analysis.