Panoramic microscope with interfering illuminating beams

被引:3
作者
Mandrosov, VI [1 ]
机构
[1] Inst Phys & Technol, Moscow 123362, Russia
来源
OPTICAL BIOPSIES AND MICROSCOPIC TECHNIQUES III, PROCEEDINGS OF | 1999年 / 3568卷
关键词
optical microscopy; imaging techniques; resolution; extended object; processing; coherence;
D O I
10.1117/12.336831
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
A new panoramic microscope design is offered. An object is illuminated by two interfering laser beams of different close frequency. The angle between the beams and their directions is varied. A energy of scattered light is detected. The detected signal is filtered at the difference frequency at the fixed beam directions and further the image using two-dimensional Fourier transform algorithm of filtered signal is built. The intensity distribution in the image is shown to have a speckled structure, typical of coherent images, with the envelope dependent on the mean slant of the object's roughness and the curvature of its surface. It is also shown that the larger the size of scattered light detecting aperture, the less the effect of the speckled structure on the image quality. Various designs of the microscope are given. The function of the system that uses a thin Fresnel lens as the light source is described in detail. Two illuminating beams move, one continuously and the other discretely, in perpendicular directions along the lens diameter. The imaging of an object with various periodical structure is simulated. The panoramic microscope designs presented in the paper allows the imaging of objects as large as 10 cm located as long as 10 cm away from the light source and the detector with the Rayleigh resolution of about lambda/2.
引用
收藏
页码:167 / 177
页数:11
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