Fourier transform profilometry of a single-field fringe for dynamic objects using an interlaced scanning camera

• FTP of a single-field fringe is proposed.
• A single-field fringe need not deinterlace, and directly reconstructs a shape by FTP.
• Reconstructed shapes are same using a single field and its corresponding frame fringe.
• The method keeps the advantages of traditional FTP, and doubles time resolution.

Fourier transform profilometry (FTP) of a single-field fringe is proposed using an interlaced scanning camera in dynamic object's surface shape measurement. The deformed fringe patterns of a measured dynamic object are grabbed by an interlaced scanning camera, every of which is divided into two single-field fringes, each of which is not necessarily deinterlaced, and directly reconstructs a 3D surface shape by using FTP. A conclusion is inferred theoretically that two reconstructed object's shapes are identical using a single-field fringe and its corresponding frame fringe. The simulation and experiment results demonstrate the feasibility and effectiveness of the proposed method. The method not only keeps the advantages of traditional FTP, but also doubles the measured system's time resolution.