Errors in Determining the Height of the Earth’s Surface Relief Using Space SARs Operating in the Interferometric Mode

2021 ◽  
Vol 55 (7) ◽  
pp. 743-753
Author(s):  
A. S. Petrov ◽  
A. S. Volchenkov
Keyword(s):  
Author(s):  
Steve Lindaas ◽  
Chris Jacobsen ◽  
Alex Kalinovsky ◽  
Malcolm Howells

Soft x-ray microscopy offers an approach to transmission imaging of wet, micron-thick biological objects at a resolution superior to that of optical microscopes and with less specimen preparation/manipulation than electron microscopes. Gabor holography has unique characteristics which make it particularly well suited for certain investigations: it requires no prefocussing, it is compatible with flash x-ray sources, and it is able to use the whole footprint of multimode sources. Our method serves to refine this technique in anticipation of the development of suitable flash sources (such as x-ray lasers) and to develop cryo capabilities with which to reduce specimen damage. Our primary emphasis has been on biological imaging so we use x-rays in the water window (between the Oxygen-K and Carbon-K absorption edges) with which we record holograms in vacuum or in air.The hologram is recorded on a high resolution recording medium; our work employs the photoresist poly(methylmethacrylate) (PMMA). Following resist “development” (solvent etching), a surface relief pattern is produced which an atomic force microscope is aptly suited to image.


2020 ◽  
pp. 67-71
Author(s):  
M.Z. Pevzner ◽  
S.A. Smertin

A model of the formation of the surface relief hiring milling of rolled billets and a method for selecting the milling mode based determining the regression dependence of the resulting relief on the processing mode are proposed. It is shown that the regulation of the processing mode as the tool wears out allows to increase the milling resource and productivity. Keywords hot rolled strips, milling, rolling, relic resistance, mill. [email protected]


Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 445
Author(s):  
Madalina Handrea-Dragan ◽  
Ioan Botiz

There is an astonishing number of optoelectronic, photonic, biological, sensing, or storage media devices, just to name a few, that rely on a variety of extraordinary periodic surface relief miniaturized patterns fabricated on polymer-covered rigid or flexible substrates. Even more extraordinary is that these surface relief patterns can be further filled, in a more or less ordered fashion, with various functional nanomaterials and thus can lead to the realization of more complex structured architectures. These architectures can serve as multifunctional platforms for the design and the development of a multitude of novel, better performing nanotechnological applications. In this work, we aim to provide an extensive overview on how multifunctional structured platforms can be fabricated by outlining not only the main polymer patterning methodologies but also by emphasizing various deposition methods that can guide different structures of functional nanomaterials into periodic surface relief patterns. Our aim is to provide the readers with a toolbox of the most suitable patterning and deposition methodologies that could be easily identified and further combined when the fabrication of novel structured platforms exhibiting interesting properties is targeted.


2020 ◽  
Vol 126 (9) ◽  
Author(s):  
Joachim Jelken ◽  
Carsten Henkel ◽  
Svetlana Santer

Abstract We study the peculiar response of photo-sensitive polymer films irradiated with a certain type of interference pattern where one interfering beam is S-polarized, while the second one is P-polarized. The polymer film, although in a glassy state, deforms following the local polarization distribution of the incident light, and a surface relief grating (SRG) appears whose period is half the optical one. All other types of interference patterns result in the matching of both periods. The topographical response is triggered by the alignment of photo-responsive azobenzene containing polymer side chains orthogonal to the local electrical field, resulting in a bulk birefringence grating (BBG). We investigate the process of dual grating formation (SRG and BBG) in a polymer film utilizing a dedicated set-up that combines probe beam diffraction and atomic force microscopy (AFM) measurements, and permits acquiring in situ and in real-time information about changes in local topography and birefringence. We find that the SRG maxima appear at the positions of linearly polarized light (tilted by 45° relative to the grating vector), causing the formation of the half-period topography. This permits to inscribe symmetric and asymmetric topography gratings with sub-wavelength period, while changing only slightly the polarization of one of the interfering beams. We demonstrate an easy generation of sawtooth profiles (blazed gratings) with adjustable shape. With these results, we have taken a significant step in understanding the photo-induced deformation of azo-polymer films.


2011 ◽  
Vol 23 (2) ◽  
pp. 91-93 ◽  
Author(s):  
D. W. Xu ◽  
S. F. Yoon ◽  
Y. Ding ◽  
C. Z. Tong ◽  
W. J. Fan ◽  
...  
Keyword(s):  

2009 ◽  
Vol 49 (5) ◽  
pp. 922-929 ◽  
Author(s):  
Woo-Hyuk Jung ◽  
Ki-Tae Lee ◽  
Dong-Han Lee ◽  
Sang-Cheol Han ◽  
Yang Kim ◽  
...  

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