Measurement of transient deformation by color encoding

Area of Science:

• Optical Measurement
• Mechanical Engineering
• Materials Science

Background:

• Accurate measurement of transient 3D deformation is crucial in various engineering fields.
• Existing methods may face limitations in precision or complexity for diffuse objects.

Purpose of the Study:

• To develop and validate a high-accuracy method for measuring transient 3D deformation in diffuse objects.
• To leverage color encoding for separating displacement components.

Main Methods:

• Illumination of the object with structured light featuring a cyan fringe pattern on a white background.
• Registration and separation of color channels (blue for surface features, red for fringes).
• Calculation of in-plane displacement using digital correlation and out-of-plane displacement from fringe patterns.

Main Results:

• Successful separation of surface features and fringe information into distinct color channels.
• Accurate quantification of both in-plane and out-of-plane displacement components.
• High accuracy demonstrated through displacement measurements on an aluminum plate.

Conclusions:

• The proposed color encoding method offers a precise and reliable approach for 3D deformation measurement.
• Avoiding signal cross-talk between color channels ensures high measurement accuracy.
• The method is validated for practical applications in transient deformation analysis.