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標題: 應用於Kinect立體感測器之新式投影元件設計
Novel Projecting Element Design for the Kinect 3D Sensor
作者: 黃韋閔
Huang, Wei-Min
關鍵字: 二元光學;binary optics;繞射光學元件;自由曲面;全像光學元件;Kinect;立體感測器;diffractive optical element;free-form surface;holographic optical element;Kinect;stereoscopic sensor
出版社: 機械工程學系所
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本研究針對Kinect立體感測器之二維繞射光學元件(diffractive optical element, DOE)做分析,探討其如何將雷射光束作繞射以得到均勻之結構光分佈,進而提出新型之全像光學元件(holographic optical element, HOE)設計,以取代該二維繞射光學元件,得到較佳之投影光束分佈。
首先將全像光學元件分為9個區域,利用光學設計軟體Zemax的"binary 1"表面型態,對描述自由曲面的相位多項式進行設計與優化。步驟分為三個階段:首先,分別對9個區域的正一繞射階進行繞射角計算;其次,將所有區域的繞射光束發散成面積相當的面光源;最後,再以高次項係數作像差修正,達到等同於原來的Kinect立體感測器之結構光分佈。此方法可以有效地利用自由曲面(free-form surface)透鏡之特性,達到均勻的結構光光強設計。
全像光學元件之製作是以二元光學(binary optics)技術為基礎,對相位多項式作曲線擬合以得到光罩之設計,並搭配微影(photolithography)與蝕刻(etching)而完成。最後架設投影光路,觀察全像光學元件投影出的正一繞射階光場形狀,量測繞射角與繞射效率,並與Kinect之繞射光學元件作比較,證明本研究可得到較均勻的光場分佈效果。

This study analyzed the two-dimensional diffractive optical element (DOE) of the Kinect stereoscopic sensor and discussed its capability to diffract a laser beam into space with uniform structured light distribution. Furthermore, a holographic optical element (HOE) design for replacing the two-dimensional DOE and obtaining better projecting light distribution was also proposed.
The HOE was segmented into nine divisions. The “binary 1” surface of the optical design software Zemax was adopted to design and optimize the phase polynomials of free-form surfaces. There are three steps in the optimization. First, the diffraction angles of the positive-one diffraction orders of nine divisions were calculated. Second, the diffracted light beams of all divisions were diverged into plane light sources with equal area. Finally, the coefficients of high order terms were applied to the aberration correction for achieving the structured light distribution similar to that of the original Kinect stereoscopic sensor. This method can effectively utilize the features of the free-form surface to realize the design with uniform structured light distribution.
Based on the technology of binary optics, the photo mask was designed by using the curve fitting of the phase polynomials and the HOE was fabricated by using the photolithography and etching processes. Then, the optical projection path was set up to observe the light shape of the positive-one diffraction order projected by the HOE and to measure the diffraction angles and efficiencies. At last, it was compared with the DOE of the Kinect stereoscopic sensor and showed that this study could fulfill the effect of light distribution with better uniformity.
其他識別: U0005-2308201217313500
Appears in Collections:機械工程學系所

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