請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/94577
標題: Design and verification of diffractive optical elements for speckle generation of 3-D range sensors
作者: Pei-Qin Du
Hsi-Fu Shih
Jenq-Shyong Chen
Yi-Shiang Wang
施錫富
關鍵字: Computer generated hologram (CGH)
Diffractive optical element (DOE)
Iterative Fourier transform algorithm (IFTA)
Range sensor
摘要: The optical projection using speckles is one of the structured light methods that have been applied to three-dimensional (3-D) range sensors. This paper investigates the design and fabrication of diffractive optical elements (DOEs) for generating the light field with uniformly distributed speckles. Based on the principles of computer generated holograms, the iterative Fourier transform algorithm was adopted for the DOE design. It was used to calculate the phase map for diffracting the incident laser beam into a goal pattern with distributed speckles. Four patterns were designed in the study. Their phase maps were first examined by a spatial light modulator and then fabricated on glass substrates by microfabrication processes. Finally, the diffraction characteristics of the fabricated devices were verified. The experimental results show that the proposed methods are applicable to the DOE design of 3-D range sensors. Furthermore, any expected diffraction area and speckle density could be possibly achieved according to the relations presented in the paper.
URI: http://hdl.handle.net/11455/94577
顯示於類別:機械工程學系所

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