Speckle imaging in astronomy

Horch, Elliott

doi:10.1002/ima.1850060415

Cited by 6 publications

(1 citation statement)

References 97 publications

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“…for laser-based displays [Chellappan et al, 2010;Kuratomi et al, 2010;Pan and Shih, 2014] and in coherent optical imaging [Liba et al, 2017;Schmitt et al, 1999]. On the other hand, it has found many applications such as speckle imaging in astronomy [Bates, 1982;Horch, 1995;Dainty, 1984b], electronic speckle pattern interferometry for stress, strain and vibration measurements of rough surfaces [Jones and Wykes, 1989;Høgmoen and Pedersen, 1977;Ennos, 1975;Sharp, 1989; and dynamic speckle for the investigation of biological processes Asakura, 1996, 1991;Fujii et al, 1985;Zheng et al, 1994;Rabal and Braga, 2008;Boas and Dunn, 2010]. Even the use of laser speckle for eye testing has been demonstrated [Mohon and Rodemann, 1973].…”

Section: Background and Introductionmentioning

confidence: 99%

X-ray Phase-Contrast Imaging Using Near-Field Speckles

Zdora¹

2021

Springer Theses

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In the last decades, X-ray phase-contrast imaging has proven to be a powerful method for unveiling the inner structure of samples and is capable of visualising even minute density differences. Recently, speckle-based imaging (SBI), the youngest X-ray phase-sensitive technique, has received great interest due to its high sensitivity, quantitative character and relaxed requirements on the setup components and beam properties. This thesis is focussed on the development, experimental optimisation and applications of SBI, with the aim of simplifying its implementation, increasing its flexibility and expanding its potential.For this, a robust, flexible data acquisition and reconstruction approach, the unified modulated pattern analysis (UMPA), was developed, which lifts previous constraints of SBI. UMPA allows for tuning of the sensitivity and spatial resolution by adjusting the scan and reconstruction parameters. It is applicable not only to random speckle, but also periodic interference patterns, bridging the gap and improving the performance of both speckle-and single-grating-based techniques.Following the first demonstration of UMPA, its potential for a range of applications is illustrated in this thesis. It is shown that UMPA can be employed for X-ray optics characterisation to quantify aberrations in the focussing behaviour of X-ray refractive lenses with high precision and accuracy. UMPA phase tomography is applied to the field of biomedical imaging for high-sensitivity three-dimensional (3D) virtual histology of unstained, hydrated soft tissue, giving unprecedented structural and quantitative density information.Further developments of SBI explored in this thesis include the testing of novel customisable speckle diffusers, the extension of SBI to higher X-ray energies for geology and materials science applications, and the demonstration of UMPA at a laboratory X-ray source. These progresses promise new possibilities of SBI for high-sensitivity, robust and high-throughput imaging in previously inaccessible fields and make SBI accessible to a wider range of users in research and industry.

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Section: Background and Introductionmentioning

confidence: 99%

X-ray Phase-Contrast Imaging Using Near-Field Speckles

Zdora¹

2021

Springer Theses

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Principles and State of the Art of X-ray Speckle-Based Imaging

Zdora

2021

X-Ray Phase-Contrast Imaging Using Near-Field Speckles

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Fast Drift-Scan CCD Imaging and Photometry with Small Telescopes: Lunar Occultations and Speckle Interferometry

Núñez¹,

Fors²

2001

International Astronomical Union Colloquium

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In this paper we show how inherent features of typical CCD cameras can be used for fast (in the order of milliseconds) photometric observations (FPO), even with submeter class telescopes. This is based on a modified drift-scanning technique which we show to be advantageous for such kind of observations. In particular, we successfully carried out some lunar occultations and speckle interferometry observations using this technique. During the year 2000, we registered several occultation events. In particular, we present the occultation of SAO79031. The millisecond photometry of the event allows us subsequent data analysis for stellar diameter estimation and close binary detection. We also show an example of the application of the technique to speckle interferometry observations. Finally, we present the main characteristics of our project to build a new remotely controlled observatory near Barcelona.

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Speckle imaging in astronomy

Cited by 6 publications

References 97 publications

X-ray Phase-Contrast Imaging Using Near-Field Speckles

X-ray Phase-Contrast Imaging Using Near-Field Speckles

Principles and State of the Art of X-ray Speckle-Based Imaging

Fast Drift-Scan CCD Imaging and Photometry with Small Telescopes: Lunar Occultations and Speckle Interferometry

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