Determination of model airplane attitudes using dynamic holographic interferometry

Area of Science:

• Optical Engineering
• Metrology
• Aerospace Engineering

Background:

• Holographic interferometry is a powerful technique for non-destructive testing and deformation analysis.
• Accurate measurement of an object's three-dimensional (3D) attitude changes is crucial in various engineering fields.
• Real-time recording and processing of holographic data are essential for dynamic applications.

Purpose of the Study:

• To demonstrate the application of real-time holographic interferometry for determining the 3D attitude changes of a model airplane.
• To showcase the use of digital image processing for analyzing interference fringes.
• To introduce a novel thermoplastic camera for dynamic hologram recording.

Main Methods:

• Real-time holographic interferometry was employed to record two-dimensional (2D) interference fringes.
• A model airplane was used as the test object to demonstrate changes in pitch, yaw, and roll.
• A second-generation thermoplastic camera facilitated in situ recording and readout of thin-phase holograms.

Main Results:

• Interference fringes were successfully superposed on the model airplane's image, correlating with attitude changes and distortion.
• Digital image processing enabled the determination of 3D attitude variations from the recorded fringes.
• The thermoplastic camera demonstrated suitability for dynamic, reversible registration of holograms.

Conclusions:

• Real-time holographic interferometry, combined with digital image processing, provides an effective method for measuring 3D attitude changes.
• The novel thermoplastic camera system is capable of dynamic hologram recording for in-situ analysis.
• Thin-phase holograms offer advantages for accurate image reconstruction.