Dr. Ralf Ziesche Profile

Dr. Ralf Ziesche

at Univ College London

SPIE Involvement:

Author

Publications (4)

Proceedings Article | 18 October 2021 Open Access

High-speed grating interferometry

Shashidhara Marathe, Ralf Ziesche, Gunjan Das, Sven Schroeder, Emily Baird, Christoph Rau

Proceedings Volume 11840, 118400L (2021) https://doi.org/10.1117/12.2598481

KEYWORDS: X-rays, Visibility, Crystals, Tomography, X-ray imaging, Optical filters, Spatial coherence, Interferometers, Image filtering, Head

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Proceedings Article | 15 October 2021 Open Access

Operando and high-throughput multiscale-tomography

Christoph Rau, Shashidhara Marathe, Andrew Bodey, Malte Storm, Darren Batey, Silvia Cipiccia, Peng Li, Ralf Ziesche

Proceedings Volume 11840, 118401E (2021) https://doi.org/10.1117/12.2598470

KEYWORDS: Diamond, Monochromators, Data acquisition, Crystals, Tomography, Crystallography, Phase contrast, X-rays, Spatial resolution, Optical filters

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We report about multiscale tomography with high throughput at the Diamond beamline I13L. The beamline has the purpose of multi-scale and operando imaging and consists of two independent branchlines operating in real and reciprocal space. The imaging branch -called Diamond-Manchester branchline- hosts micro-tomography, grating interferometry and a full-field microscope. For rapid recording a broad spectrum of the undulator radiation is used either with band-passing the light with a combination of a filter and a deflecting mirror or using a multilayer monochromator. For all the methods similar recording times can be achieved, with typical scanning times of some minutes and covering the resolution range from microns to the 100nm range. Most recently a robot arm has been installed to increase the throughput to 300 samples per day. The system is now implemented for user operation in remote operation mode for the micro-tomography setup and can be expanded to the two other experiments. The instrumental capabilities are applied on various topics such as the study of biodiversity of insects or the structural variations of electrode materials in batteries. Fast recording with dedicated sample environments (not using the sample changing robot) enables operando studies in many areas, the charging/discharging cycles on batteries, the degradation of teeth enamel under various conditions or loading brine sandstone mixtures with CO2, to name some examples. For imaging with highest spatial resolution we managed to improve significantly the recording speed of ptycho-tomography, which is now in the order of hours and will be reduced further. We demonstrated in the past 2-D recording with 10kHz and expand the instrumental capability with specific hardware dependent triggering and scanning schemes. We expand the research program for multi-scale imaging across both branchlines (imaging and coherence branchlines) with first studies such as batteries, brain research, concrete.

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