Portal de Periódicos da CAPES

Fourier-transform speckle profilometry: three-dimensional shape measurements of diffuse objects with large height steps and/or spatially isolated surfaces

1994; Optica Publishing Group; Volume: 33; Issue: 34 Linguagem: Inglês

10.1364/ao.33.007829

0003-6935

Mitsuo Takeda, H. Yamamoto,

Advanced Measurement and Metrology Techniques

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.