An interferometric technique for automated profilometry of diffuse objects has been proposed. It is based on the Fourier-fringe analysis of spatiotemporal specklegrams produced by a wavelength-shift interferometer with a laser diode as a frequency-tunable light source. Unlike conventional moiré techniques the proposed technique permits the objects to have discontinuous height steps and/or surfaces spatially isolated from one another. Experimental results are presented that demonstrate the validity of the principle.
© 1994 Optical Society of America
Original Manuscript: January 19, 1994
Revised Manuscript: June 14, 1994
Published: December 1, 1994
Mitsuo Takeda and Hirokazu Yamamoto, "Fourier-transform speckle profilometry: three-dimensional shape measurements of diffuse objects with large height steps and/or spatially isolated surfaces," Appl. Opt. 33, 7829-7837 (1994)