Collimation Sensing With Differential Grating and Talbot Interferometry
نویسندگان
چکیده
منابع مشابه
Improved collimation testing using Talbot interferometry.
Several schemes for checking collimation of a light beam based on the self-imaging (Talbot effect) combined with the moire technique have been described. When a grating is illuminated by a collimated beam of monochromatic light, exact self-images of the grating are formed at certain welldefined planes perpendicular to the direction of the beam. The moire pattern is observed by placing an identi...
متن کاملCollimation method that uses spiral gratings and Talbot interferometry.
The tested light is projected onto an arrangement composed of two special spiral gratings, in which the second spiral grating is positioned at the Talbot image of the first one. From the shapes of the resultant moiré fringes, the quality of collimation of the tested light can be easily checked.
متن کاملCollimation method using a double grating system.
We present a collimation technique based on a double grating system to locate with high accuracy an emitter in the focal plane of a lens. Talbot self-images are projected onto the second grating producing moiré interferences. By means of two photodetectors positioned just behind the second grating, it is possible to determine the optimal position of the light source for collimation by measuring...
متن کاملPolarimetric Interferometry and Differential Interferometry
This Lecture mainly based on [1, 2] presents the role of Polarimetry in SAR Interferometry. A general formulation for vector wave interferometry is presented that includes conventional scalar interferometry presented in the respective former lecture as a special case. Based on this formulation, the coherence optimization problem can be solved to obtain the optimum scattering mechanisms that lea...
متن کاملExplicit Filtering Based Low-Dose Differential Phase Reconstruction Algorithm with the Grating Interferometry
X-ray grating interferometry offers a novel framework for the study of weakly absorbing samples. Three kinds of information, that is, the attenuation, differential phase contrast (DPC), and dark-field images, can be obtained after a single scanning, providing additional and complementary information to the conventional attenuation image. Phase shifts of X-rays are measured by the DPC method; he...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: IEEE Photonics Journal
سال: 2014
ISSN: 1943-0655
DOI: 10.1109/jphot.2014.2317678