CAJ | 학술논문

高斯光束照射以固定角速度旋转的粗糙圆柱体表面,反射空间形成随着被测表面运动变化的动态散斑.研究了照射面积大于圆柱曲面条件下在远场衍射区形成的动态散斑统计特性,得到了不同入射条件及不同圆柱时动态散斑强度起伏空间-时间归一化相关函数.结果表明:随着圆柱半径、旋转速度以及照射光斑有效面积的增大,动态散斑强度起伏相关性快速减小；当圆柱旋转速度恒定,动态散斑光强起伏相关函数的峰值随着探测点之间距离的增大而减小,但峰值的位置随之而增大；在近似点照射情况下随着圆柱半径的增大空间相关长度基本不变,而相关时间性明显增大.
고사광속조사이고정각속도선전적조조원주체표면,반사공간형성수착피측표면운동변화적동태산반.연구료조사면적대우원주곡면조건하재원장연사구형성적동태산반통계특성,득도료불동입사조건급불동원주시동태산반강도기복공간-시간귀일화상관함수.결과표명:수착원주반경、선전속도이급조사광반유효면적적증대,동태산반강도기복상관성쾌속감소；당원주선전속도항정,동태산반광강기복상관함수적봉치수착탐측점지간거리적증대이감소,단봉치적위치수지이증대；재근사점조사정황하수착원주반경적증대공간상관장도기본불변,이상관시간성명현증대.
Dynamic speckles appear when a cylinder rotating with a constant angular velocity is irradiated by a Gaussian light beam.The statistical property of dynamic speckles in far-field diffraction is acquired when the irradiated area is larger than the cylinder surface.The normalized space-time cross-correlation of dynamic speckle intensity fluctuations is obtained with different cylinder radii in different incidence conditions.The results show that the correlation is improved when the cylinder radius and rotating speed decrease.When the cylinder rotates at a constant speed,the peak value of cross-correlation function descends gradually as the distance between the two observation points increases,whereas the peak position increases,In the case of approximate point irradiation,the spatial correlation length is almost unchanged and the correlation time extends obviously as the cylinder radius increases.