光学精密工程2012，Vol.20Issue(12)：2654-2660,7.DOI:10.3788/OPE.20122012.2654
旋转粗糙圆柱的激光散射功率谱分析
Analysis of power spectra for laser scattering intensity on rotating cylinder targets
摘要
Abstract
A mathematical model for the power spectrum density function of dynamic speckles "was established to complete the nondestructive measurement of a diffuse target. First, the dynamic speckle characteristics formed by the reflection space of a rotating cylinder at an immobile angular velocity were discussed when it was fully illuminated by a collimated light beam. The theoretical model on the cross-correlation function and the power spectrum density function of dynamic speckle intensity fluctuation was given and the coherent length and receiving signal bandwidth of the dynamic speckle field were described. Then, the impacts of speckle translation and speckle boiling caused by rotation cylinder on the received signal bandwidth were analyzed. Finally, the near-specula of the cylinder and the diffuse speckle patterns were measured. Obtained results indicate that when the wavelength of 0. 633 μm is shone on the cylinder with a diameter of 1 mm, the correlation time of autocorrelation function is 4 ms for a 10 Hz rotating cylinder and 2. 0 ms for a 20 Hz rotating cylinder. In conclusion, the Doppler effects and speckle translation effects in the speckle dynamic field can produce the bandwidth with the same order of magnitude, and the speckle boiling effect can be negligible.关键词
激光散射/动态散斑/旋转圆柱/粗糙目标/功率谱/带宽Key words
laser scattering/ dynamic speckle/ rotating cylinder/ roughness target/ power spectrum bandwidth分类
信息技术与安全科学引用本文复制引用
武颖丽,吴振森..旋转粗糙圆柱的激光散射功率谱分析[J].光学精密工程,2012,20(12):2654-2660,7.基金项目
国家自然科学基金资助项目(No.61172031) （No.61172031）
中央高校基本科研业务费专项资金资助项目(No.K50511070005) （No.K50511070005）
