The frequency and contrast characteristics of the unit of the shadow image formation point to a material weakening of the high-frequency components in the spectrum of spatial frequencies already during the formation of the X-ray image. To compensate for this weakening that also takes place in other subassemblies of the television X-ray installation the introduction of an aperture corrector is necessary. As such a corrector in transmitting an image of little mobile objects a bidimensional aperture corrector set up on the transmitting television tube can be effectively used.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
In the instrument suite of the Thirty Meter Telescope (TMT), the linear atmospheric dispersion corrector (LADC) is positioned at the forefront of the spectrometer to mitigate atmospheric dispersion. The LADC comprises two large aperture wedge prisms, each approximately 1.5 meters in diameter.
View Article and Find Full Text PDFMultilayer Laue lenses are volume diffractive optical elements for hard X-rays with the potential to focus beams to sizes as small as 1 nm. This ability is limited by the precision of the manufacturing process, whereby systematic errors that arise during fabrication contribute to wavefront aberrations even after calibration of the deposition process based on wavefront metrology. Such aberrations can be compensated by using a phase plate.
View Article and Find Full Text PDFDesign of Electrostatic Aberration Correctors for Scanning Transmission Electron Microscopy.
Microsc Microanal
December 2023
National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
In a scanning transmission electron microscope (STEM), producing a high-resolution image generally requires an electron beam focused to the smallest point possible. However, the magnetic lenses used to focus the beam are unavoidably imperfect, introducing aberrations that limit resolution. Modern STEMs overcome this by using hardware aberration correctors comprised of many multipole elements, but these devices are complex, expensive, and can be difficult to tune.
View Article and Find Full Text PDFFor large ground-based telescopes, static and dynamic disturbances would greatly degrade the optical performance. This is especially true for wide field survey telescopes with prime focus optics. The estimation of disturbance effects on large telescopes is becoming increasingly important during the design phase.
View Article and Find Full Text PDFA stable and reliable support system for large aperture wedge prisms is the priority of the atmospheric dispersion corrector (ADC). The prism is not a rotationally symmetric component, and the stress distribution on large aperture wedge prisms caused by the support system is different compared with the rotationally symmetric mirror. A scheme of support forces passing through the prism center of gravity (COG) is proposed in this paper.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!