跳到主要內容

臺灣博碩士論文加值系統

(44.213.60.33) 您好!臺灣時間:2024/07/21 13:41
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

: 
twitterline
研究生:邱冠堯
研究生(外文):Kuan-yao Chiu
論文名稱:以旋轉及震動光導管抑制雷射光斑之研究
論文名稱(外文):Reduction of Speckle Noise with Rotating and Vibrating Light-Guide Optical Element
指導教授:陳建宇陳建宇引用關係
指導教授(外文):Chien-yue chen
學位類別:碩士
校院名稱:國立雲林科技大學
系所名稱:電子與光電工程研究所碩士班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2013
畢業學年度:101
語文別:中文
論文頁數:72
中文關鍵詞:車用抬頭顯示器雷射投影消除光斑光導管
外文關鍵詞:light pipelaser projectionHUDspeckle reduction
相關次數:
  • 被引用被引用:0
  • 點閱點閱:1019
  • 評分評分:
  • 下載下載:10
  • 收藏至我的研究室書目清單書目收藏:0
雷射的高同調性使投影屏幕產生強烈的干涉現象,使投影影像存在光斑的干擾,因此本研究提出以旋轉擴散片和震動光導管的方式減少雷射投影系統中的光斑。本研究提出創新的技術達到抑制光斑的效果,雖然擴散片會使影像光強度下降,但本研究使用震動光導管的技術修正了擴散片損耗光強度的缺點,且應用在產品上結合性強,成本花費低。
本研究中所選用的擴散片(Diffuser)是使用粉狀的Al2O3研磨而成,半徑為 50mm,表面粗糙度(Ra)為1.575 ,藉由擴散片高低起伏的結構,讓已經擴束的雷射光,再次破壞雷射光的波前,這種方式稱作破壞雷射光的空間同調性,而破壞的程度則是根據擴散面的幾何結構的粗糙度,當擴散片的粗糙度愈高時,表示擴散片的表面愈粗糙,相對地破壞雷射光的波前也越劇烈,而使此技術同時也能消除系統中透鏡產生的畸變像差。另一方面,以震動光導管的方式,在光導管的外壁固定一震動馬達,藉由管壁的震動效果,讓這道擴束雷射光在管中傳導時,藉由內管壁全反射效應以及微小的震動效果,讓光斑圖形產生時間均勻化效應,成功的降低光斑對比度。
傳統消除光斑的技術中,能有效地抑制光斑效果,下降到人眼無法辨識的品質,但都存在許多的缺點,如難與商品做結合、成本高、光強度損耗嚴重等,因此,藉由旋轉擴散片的方式,將擴散片與系統做結合,同樣能消除光斑效果,且擴散片的空間使用率低,未來在產品的應用上結合性較佳。另外,藉由震動光導管的作用,達到降低光斑的影響,且因為全反射效應減少光強度的損耗,相較於擴散片或繞射光學元件的光強度損耗,震動光導管消光斑技術,其光強度能可以保持在70%以上。
The high coherence of laser could result in interference in protector screens to interfere the image with speckle. This study proposes to reduce the speckle in laser projection systems by rotating diffusers and vibrating light pipes. Such an innovative technology could restrain the speckle. This study modifies the shortcoming of diffusers reducing the light intensity of images by vibrating light pipes that the application presents strong combination with products and low costs.
The diffuser is made of Al2O3 powder, with the radius 50mm and the surface roughness (Ra) 1.575. The wave structure of diffusers allows the expanded laser beam destroying the wavefront of laser beams. Such a method is to destroy the spatial coherence of laser beams according to the geometric structure roughness of the diffusing plane. When the roughness is higher, the diffuser surface is rougher that the wavefront destruction of laser beams appears more fiercely. Such a technique could remove the distortion caused by the lens in the system. On the other hand, the outer wall of the light pipe is fixed a vibration motor to have the expanded laser beam conduct in the pipe through the vibration of the pipe wall. When the expanded laser beam is conducted in the pipe, the total reflection effect and the tiny vibration of the inner pipe wall could have the speckle appear time-averaging to successfully reduce the speckle contrast.
Traditional removal of speckle could effectively restrain the speckle down to the human eyes not being able to identify. Nonetheless, there are a lot of shortcomings, such as hard to be combined with products, high costs, and serious light intensity waste. The rotated diffuser therefore is combined with the system to remove the speckle and reduce the spatial use of diffusers that it reveals better combination with products. Furthermore, vibrating light pipes could reduce the speckle and the total reflection effect could decrease the light intensity waste that the light intensity could remain above 70%, in comparison with the light intensity waste of diffuser or diffraction optical elements.
中文摘要 I
ABSTRACT II
誌謝 IV
目錄 V
圖目錄 VII
表目錄 X
第一章、緒論 1
1.1前言 1
1.2研究動機與目的 3
1.3論文架構 3
第二章、雷射光斑 5
2.1雷射光斑的發現 5
2.1.1雷射光斑 5
2.1.2雷射光斑的數學表示 7
2.2雷射光斑的強度與相位 11
2.3雷射光斑對比度 13
第三章、實驗架構原理 16
3.1利用旋轉擴散片消除雷射光斑與抑制畸變像差 16
3.1.1雷射式車用抬頭顯示器設計 16
3.1.2光學設計 16
3.1.3旋轉擴散片的設計 18
3.1.4利用擴散片抑制畸變像差 20
3.1.5利用旋轉光學擴散片抑制雷射光斑 21
3.1.6實驗結果 22
3.2利用震動光導管消除雷射光斑 24
3.2.1抑制雷射光斑的空間同調性 24
3.2.2抑制雷射光斑的時間同調性 26
3.2.3震動光導管的實驗設計 29
3.2.4實驗結果 31
第四章、雷射投影車用抬頭顯示器之設計與製作 35
4.1雷射投影車用抬頭顯示器之架構設計 35
4.2雷射式車用抬頭顯示器成品架構之實測結果 38
4.2.1實測架構之設計 38
4.2.2實測結果Ⅰ 40
4.2.3實測結果Ⅱ 41
第五章、結果與討論 44
5.1利用旋轉擴散片消除雷射光斑 44
5.1.1抑制光斑對比度 44
5.1.2抑制畸變像差 45
5.1.3光強度均勻化討論 47
5.2利用震動光導管消除雷射光斑 48
5.2.1破壞空間同調性抑制光斑對比度 48
5.2.2破壞時間同調性抑制光斑對比度 50
5.3雷射式車用抬頭顯示器的光斑討論 52
5.3.1光斑對比度之討論 52
5.3.2影像品質之討論 54
5.3.3整體架構的改善 54
第六章、結論與未來展望 56
6.1結論 56
6.2未來展望 57
參考文獻 59
[1]K. V. Chellappan, E. Erden, and H. Urey, “Laser-based display: a review,” Appl. Opt. 49, F79-F98, 2010.
[2]J. W. Goodman, Speckle phenomena in optics: theory and applications: Roberts &; Co, 2007.
[3]Lingli Wang, Theo Tschudi, Thorsteinn Halldorsson, and Palmi R. Petursson, “Speckle reduction in laser projection systems by diffractive optical elements,” Appl. Opt. 37, 1770-1775, 1998.
[4]W. R. Klein and B. D. Cook, “Unified approach to ultrasonic light diffraction,” IEEE Trans. Son. Ultrason, SU-14, 123-134. 1967.
[5]N. George and A. Jain, “Speckle Reduction Using Multiple Tones of Illumination,” Appl. Opt. 12, 1202-1212, 1973.
[6]S. H. Shin and B. Javidi, “Speckle-reduced Three-dimensional Volume Holographic Display by Use of Integral Imaging,” Appl. Opt. 41, 2644-2649, 2002.
[7]M. N. Akram, V. Kartashov, and Z. Tong, “Speckle reduction in line-scan laser projectors using binary phase codes,” Opt. Letters 35, 444-446, 2010.
[8]S. An, A. Lapchuk, V. Yurlov, J. Song, H. Park, J. Jang, W. Shin, S. Kargapoltsev and S. K. Yun, “Speckle suppression in laser display using several partially coherent beams,” Opt. Express 17, 92-103, 2009.
[9]J. I. Trisnadi, “Hadamard speckle contrast reduction,” Opt. Letters 29, 11-13, 2004.
[10]M. Nadeem Akram, Zhaomin Tong, Guangmin Ouyang, Xuyuan Chen, and Vladimir Kartasho, “Laser speckle reduction due to spatial and angular diversity introduced by fast scanning micromirror,” Appl. Opt. 49, 3297-3304, 2010.
[11]J. W. Goodman, “Statistical properties of laser speckle patterns in Laser Speckle and Related Phenomena,” of Topics in Appl. Phys. 9, J. C. Dainty, ed. Springer-Verlag: Berlin, 9-76, 1975.
[12]S. Lowenthal and H. Aresenault, “Speckle Removal by a Slowly Moving Diffuser Associated with a Motionless Diffuser,” J. Opt. Soc. Am. 61, 847, 1971.
[13]J. C. Dainty, “Laser speckle and Related Phenomena,” Springer-Verlag, Berlin, 1984.
[14]J. W. Goodman, “Speckle Phenomena in Optics,” Theory and Applications, Roberts, New York, 2006.
[15]M. Francon, Laser Speckle and Applications in Optics, Academic Press, New York, San Francisco, London, 1979.
[16]A. J. Weierholt, E. G. Rawson, and J. W. Goodman, “Frequency-correlation properties of optical waveguide intensity patterns,” J. Opt. Soc. Am. A 1, 201-205, 1984.
[17]E. G. Rawson, A. B. Nafarrate, and J. W. Goodman, “Speckle-free rear-projection screen using two close screens in slow relative motion,” J. Opt. Soc. Am. 66, 1290, 1976.
[18]C. Y. Chen, W. C. Su, C.H. Lin, M. D. Ke, Q. L. Deng, and K.Y. Chiu, “Reduction of speckles and distortion in projection system by using a rotating diffuser,” Optical Review 19, 440-443, 2012.
[19]H. Funamizu, and J. Uozumi, “Generation of fractal speckles by means of a spatial light modulator,” Opt. Express. 15, 7415-7422, 2007.
[20]J. Trisnadi, “Speckle contrast reduction in laser projection displays,” Proc. SPIE 4657, 131-137, 2002.
[21]Wei-Chia Su, Chien-Yue Chen, Yi-Fan Wang, Yu-Wen Chen, and Sidney S Yang, “Effect of a diffuser on distortion reduction for a virtual image projector,” J. Opt. 13, 105401, 2011.
[22]Z. Liao, et al., “Speckle reduction in laser projection display by modulating illumination light,” Proc. SPIE 6622, 29, 2007.
[23]Y. Kuratomi, K. Sekiya, H. Sato, H. Sato, T. Kawakami, T. Uchida, “Analysis of speckle-reduction performance in a laser rear-projection display using a small moving diffuser,” J. Soc. Inf. Disp. 18, 1119-1126, 2010.
[24]M. Sun and Z. Lu, “Speckle suppression with a rotating light pipe,” Opt. Eng. 49, 024202, 2010.
[25]P. C. Ashok, U. Nair, V. Kas, V. N. N. Namboothiri, and V. P. N. Nampoori, “Speckle metrology based study on the effect of chattering on machined surfaces,” Proc. SPIE 6671, 6671V, 2010.
[26]C. Rydberg, J. Bengtsson and T. Sandstrom, “Dynamic laser speckle as a detrimental phenomenon in optical projection lithography,” J. Microlith. Microfab. Microsyst. 5(3), 033004-1-8, 2006.
[27]J. M. Artigas, A. Felipe, and M. J. Buades, “Contrast sensitivity of the visual system in speckle imagery,” J. Opt. Soc. Am. A 11, 2345-2349, 1994.
[28]H. Furue, A. Terashima, M. Shirao, Y. Koizumi, and M. Ono, “Control of Laser Speckle Noise Using Liquid Crystals,” Jpn. J. Appl. Phys. 50, 1-3, 2011.
[29]V. Yurlov, A. Lapchuk, S. Yun, J. Song, and H. Yang, “Speckle suppression in scanning laser display,” Appl. Opt. 47, 179-187, 2008.
[30]V. Yurlov, A. Lapchuk, S. Yun, J. Song, I. Yeo, H. Yang, and S. An, “Speckle suppression in scanning laser display: aberration and defocusing of the projection system,” Appl. Opt. 48, 80-90, 2009.
[31]O. B. Thompson and M. K. Andrews, “Spatial and Temporal effects in speckle perfusion measurement,” Proc. SPIE 7176, 717604, 2009.
[32]L. I. Goldfischer, “Autocorrelation Function and Power Spectral Density of Laser-Produced Speckle Patterns,” J. Opt. Soc. Am. 55, 247-252, 1965.
[33]A. Gupta, J. Lee, and R. J. Koshel, “Design of efficient lightpipes for illumination by an analytical approach,” Appl. Opt. 40, 3640-3648, 2001.
[34]F. Riechert, G. Bastian, and U. Lemmer, “Laser speckle reduction via colloidal-dispersion-filled projection screens,” Appl. Opt. Vol. 48, No. 19, pp. 3742-3749, 2009.
[35]S. Roelandt, Y. Meuret, G. Craggs, G. Verschaffelt, P. Janssens, and H. Thienpont, “Standardized speckle measurement method matched to human speckle perception in laser projection systems,” Opt. Express 20, 8770, 2012.
[36]Y. Kuratomi, K. Sekiya, H. Satoh, T. Tomiyama, T. Kawakami, B. Katagiri, Y. Suzuki, and T. Uchida, “Speckle reduction mechanism in laser rear projection displays using a small moving diffuser,” J. Opt. Soc. Am. A 27, 1812, 2010.
[37]J. F. V. Derlofske and T. A. Hough, “Analytical model of flux propagation in light-pipe systems,” Opt. Eng. 43, 1503-1510, 2004.
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top