Design of a pavement scanning system based on structured light of interference fringe

A multispectral three-dimensional (3-D) digital infrared thermal imaging (DITI) system is demonstrated for medical thermographic applications. In this system, temperature distribution and the three-dimensional geometrical surface profile are measured with different wavelengths and digitally stored in a computer separately. A texture-mapping technique is used for the accurate digital reconstruction of a 3-D temperature distribution of the human body. 3-D human body surface thermograms are obtained with this system.

Multispectral three-dimensional digital infrared thermal imaging

Arbitrary phase shifting method for fiber-optic fringe projection profilometry based on temporal sinusoidal phase modulation

A fixed wavelength absolute distance interferometer including a first interferometer comprising a first light source transmitting a first light beam having a wavelength W toward a measurement target, a wavefront radius detector configured to provide a first measurement responsive to the wavefront radius at the wavefront radius detector, and a first path length calculating portion calculating a coarse resolution absolute path length measurement R; and a second interferometer comprising a beam transmitting device transmitting a second-interferometer light beam having a wavelength Λ, a beam splitting/combining device separating the second-interferometer light beam into reference and measurement beams and combining the returning reference and measurement beams into a combined beam, a second-interferometer detector configured to receive the combined beam and provide signals of a phase φ of the combined beam, and a second path length calculating portion configured to determine a medium resolution absolute path length measurement ZM.

Fixed wavelength absolute distance interferometer

Fourier Transform Interferometry for 3D Mapping of Rough and Discontinuous Surfaces

The method used to manufacture a Young’s double pinhole interferometer is discussed. This interferometer is destined to be used in a surface profilometer using two wavelengths so that the zero order fringe can be determined. Hence stringent requirements are placed on the absolute length difference between the two output fibers of a single mode coupler. These requirements are discussed along with the manufacturing process. The interferometer is shown along with measurements showing a length difference on the order of 6µm.

Manufacturing of a fiber optic Young’s double pinhole interferometer for use as a 3-D profilometer

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Manufacturing of a fiber optic Young’s double pinhole interferometer for use as a 3-D profilometer