光学学报, 1987, 7 (2): 175, 网络出版: 2011-09-20
超声驻波波面的激光相关成像
Laser correlation imaging of UHF acoustic standing wavefront
摘要
本文利用傅氏光学概念分析激光通过声驻波后的远场光场,不但被分解成空间频谱,而且在空间频谱中又有时间频谱。以此为依据,分析了超声驻波成稳定像的原理和过程:通过时间互相关过程,得出不同空间频谱中同时间频率光的非零相关值;再由不同时间频率的非相干光进行强度线性叠加,最后形成超声驻波波面的稳定像。从而澄清了声驻波成像中的一些理论上的混淆,找到了成像的新途径,实验上也得到了证实。
Abstract
On the basis of the Fourier optics, we ve analysed the optical far-field of a laser beam passing through the UHF acoustic standing waves and found that there is temperal spectrum in the spatial spectrum on the far-field plane besides the spatial spectrum. In accordance with the above results we ve developed an imaging principle of UHF acoustic standing wavefronts: by temporal crosscorrelation, the non-zero Value of correlation of the same temporal frequencies in the different spatial frequencies is obtained. Therefore we have not only clarified the confusion of the theory but also developed a new method for imaging the UHF acoustic st anding wavefronts. And the results have been proved experimehtally.
易明, 刘立新, 吴志贤, 黄宗华, 杨选民. 超声驻波波面的激光相关成像[J]. 光学学报, 1987, 7(2): 175. YI MING, LIU LIXIN, WU ZHIXIAN, HUANG ZONGHUA, YANG XUANMIN. Laser correlation imaging of UHF acoustic standing wavefront[J]. Acta Optica Sinica, 1987, 7(2): 175.