-
摘要:研究了基于声光可调滤波机理的光谱相机在成像时由声光晶体的色散而产生的图像漂移现象。利用色散补偿法和图像位移补偿法,理论计算并实验测量了声光可调滤波器(AOTF)在可见光(488~644 nm)波段内由晶体外衍射角所引起的图像漂移,并进行了优化实验。采用色散补偿法,调整入射光为准平行光,入射光波长为488~644 nm时,在晶体出射面添加0.6的光楔,晶体外衍射角的变化量可由0.066 50降低到0.004 2,即图像漂移量由162.1 m降低到10.9 m;采用图像位移补偿法,不添加光楔,入射光波长为488~644 nm时,图像水平漂移量可从468 m降低到0.658 m,漂移量在一个像元内。实验表明:基于提出的两种方法可忽略成像漂移对图像的影响,有效提高了基于AOTF机理的光谱相机的成像分辨率。Abstract:The image drift phenomenon caused by the dispersion of an acousto-optic crystal is researched when the spectral camera is imaging based on acousto-optic tunable filtering mechanism. The image drift caused by the crystal outside diffraction angle is calculated theoretically and measured experimentally by the dispersion compensation and the image displacement compensation methods when a Acousto-optic Tunable Filter(AOTF) is in the visible band of 488-644 nm, and the experiments are also optimized and analyzed. Using the dispersion compensation method and in the incident light wavelength of 488-644 nm, when we adjust the incident subject as a parallel light and add a wedge of 0.6 in the crystal exit surface, the change of the crystal outside diffraction angle can be reduced from 0.066 50 to 0.004 2, and the image drift is reduced from 162.1 m to 10.9 m. Using the image displacement compensation method without adding the optical wedge, when the incident light wavelength is in 488-644 nm, the image level drift can be reduced from 468 m to 0.658 m within a pixel drift. Experimental results show that the effect of the imaging can be neglected, and the two methods can improve the imaging resolution of the AOTF based on mechanism of the spectral camera.
-
[1] BRILLOUIN L,DE PHYSIQUE A. Diffusion de la lumiere et des rayons X par un corps transparent homogene-influence de l'agitation thermique[J].Annales de Physique,1922,17:88-122. [2] DEBYE P,SEARS F W. On the scattering of light by supersonic waves[J].Proceedings of the National Academy of Science,1932,18(6):409-414. [3] LUCAS P M R,BIQUARD P. Optical properties of solid and liquid medias subjected to high-frequency elastic vibrations[J].Le Journal de Physique et le Radium,1932,549 (3):464-477. [4] KLEIN W R,COOK B D. Analysis of Kapitza-Dirac diffraction patterns beyond the Raman-Nath regime[J].Optics Express,2009,(17):19173-1180. [5] ZENG S,BI K,XUE S,et al.. Acousto-optic modulator system for femtosecond laser pulses[J].Rev Sci Instrum,2007,78(1):015103. [6] 杨薇,刘迎,肖立峰,等.声光可调谐环形腔掺铒光纤 器[J].物理学报,2010,59(2):1030-1035. YANG W,LIU Y,XIAO L F,et al.. Acousto-optic wavelength-tunable erbium-dopedfiber ringlaser[J].Acta Phys Sin,2010,59(2):1030-1035.(in Chinese) [7] DIXON R W. Acoustic diffraction of light in anisotropic media[J].IEEE J. Quantum Electronics,1967,3(2):85-93. [8] TAKAHASHI K,TANAKA K,HASHIMOTO N,et al.. Widely(132 nm) wavelength tunable laser using semiconductor optical amplifier and acousto-optic tunable filter[J].Electronics Lett.,2004,40(19):1187-1188. [9] HARRIS S E,WALLACE R W. Acousto-optic tunable filter[J].J. Optical Society America,1969,59(6):744-747. [10] CHANG I C. Phosphorescence imaging system using an acousto-optic filter-based charge coupled device[J].SPIE,1997,351:229-239. [11] GLENAR D A,HILLMAN J J,SAIF B,et al.. Acousto-optic imaging spectropolarimetry for remote sensing[J].Appl. Opt.,1994,33(31):7412-7424. [12] GLENAR D A,HILLMAN J J. Acousto-optic imaging spectropolarimetry for remote sensing[J].Appl. Optic,1994,33(31):7412-7424. [13] LV X,ZHAN C,ZENG S,et al.. Construction of multiphoton laser scanning microscope based on dual-axis acousto-optic deflector[J].Rev Sci. Instrum,2006,77(4):046101. [14] 赵慧洁,程宣,张颖.用于火星探测的声光可调谐滤波器成像光谱仪[J].光学 精密工程,2012,20(9):945-1952. ZHAO H J,CHENG X,ZHANG Y. Design of acousto-optic imaging spectrometer for mars exploration[J].Opt. Precision Eng.,2012,20(9):945-1952.(in Chinese) [15] 张建英,谢文明,曾志平,等.光声成像技术的最新进展[J].中国光学,2011,4(2):111-117. ZHANG J Y,XIE W M,ZENG ZH P,et al.. Recent progress in photoacoustic imaging technology[J].Chinese Optics,2011,4(2):111-117.(in Chinese) [16] 吕晓华,占成,张红民,等.随机扫描多光子荧光显微成像系统[J].光学学报,2006,26(11):1823-1828. LV X H,ZHAN CH,ZHANG H M,et al.. Construction of random-access scanning multiphoton fluorescence microscope system[J].Acta Optica Sinica,2006,26(11):1823-1828.(in Chinese) [17] NGOI B K A,VENKATAKRISHNAN K,TAN B,et al.. Angular dispersion compensation for acousto-optic devices used for ultrashort-pulsed lasermicromachining[J].Opt Express,2001,9(4):200-206. [18] BELLON V,VIGNEAU J L,SVILA F. Infrared and near-infrared technology for the food industry and agricultural uses:on-line applications[J].Food Control,1994,5(1):21-27. [19] KHOSHNEVISAN M,SOVERO E. Development of a cryogenic infarred acousto-optic tunable spectral filter[J].SPIE,1980,245:63-68. [20] 任玉,蔡红星,谭勇,等.基于TeO2旋光特性对声光可调滤波器消色散的设计[J].中国科学,2011,41(8):917-923. REN Y,CAI H X,TAN Y,et al.. Design of the acousto-optic tunable filter base on the rotatory property of TeO2[J].Scientia Sinica,2011,41(8):917-923.(in Chinese) [21] 任玉.基于布拉格调制下的成像光谱仪的分光部分研究[D].长春:长春理工大学,2011. REN Y. Study on dispersion parts by bragg modulating in imaging spectrometer[D]. Changchun:Changchun University of science and Technology,2011.(in Chinese) [22] 德荣,吕晓华,吴萍,等.声光偏转器扫描飞秒 的时间色散补偿[J].物理学报,2006,55(9):4729-4733. DE R,LV X H,WU P,et al.. Compensation of temporal dispersion for acousto-optical deflector scanning femtosecond laser[J].Acta Phys Sin,2006,55(9):4729-4733.(in Chinese)
点击查看大图
计量
- 文章访问数:3131
- HTML全文浏览量:480
- PDF下载量:675
- 被引次数:0