Three-Dimensional Optical Measurement with Spectroscopic Function Using Fiber Laser Supercontinuum
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概要
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A three-dimensional (3D) measurement system with spectroscopic function was demonstrated using a practical supercontinuum light source and an all-fiber interferometer. Spectral information was obtained by Fourier transformation of the observed interference signal. We obtained the absorbances of various plastics. In addition, the system was capable of discerning different surface asperities that were smaller than the spatial resolution of the system by observing the spectral modulation caused by spectral interference that occurred when there was an asperity in the irradiated beam spot. The frequency of the spectral modulation depended on the height of the asperity. In this paper, the spectral modulation was analyzed by numerical calculations, and images based on the spectral modulation differences were obtained experimentally. The longitudinal and transverse resolutions were 3.0 and 125 μm, respectively. Based on the spectral modulation, we demonstrated that our 3D measurement system could obtain images of asperities of diameters 3, 6, 15, and 90 μm, which were smaller than the spatial resolution. A clear 3D image of a metallic cylinder with a small blemish was also obtained using this system.
- 2011-03-25
著者
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Itoh Kazuyoshi
Division Of Advanced Science And Biotechnology Graduate School Of Engineering Osaka University
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Ohta Takefumi
Division Of Advanced Science And Biotechnology Osaka University
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Nishizawa Norihiko
Department Of Electrical Engineering And Computer Science Nagoya University
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Ohta Takefumi
Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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Ozawa Tetsuya
Department of Electrical Engineering, Miyagi National College of Technology, Natori, Miyagi 981-1239, Japan
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Itoh Kazuyoshi
Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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