An ultra fast electron beam x-ray tomography scanner

Abstract

This paper introduces the design of an ultra fast x-ray tomography scanner based on electron beam technology. The scanner has been developed for two-phase flow studies where frame rates of 1 kHz and higher are required. Its functional principle is similar to that of the electron beam x-ray CT scanners used in cardiac imaging. Thus, the scanner comprises an electron beam generator with a fast beam deflection unit, a semicircular x-ray production target made of tungsten alloy and a circular x-ray detector consisting of 240 CZT elements with 1.5 mm × 1.5 mm × 1.5 mm size each. The design is optimized with respect to ultra fast imaging of smaller flow vessels, such as pipes or laboratory-scale chemical reactors. In that way, the scanner is capable of scanning flow cross-sections at a speed of a few thousand frames per second which is sufficient to capture flows of a few meters per second velocity.

Regime transition in viscous and pseudo viscous systems: A comparative study

“…The in-house developed ultrafast electron beam X-ray tomography setup 41,42 was used to visualize stacks of crosssectional images of the flow structure inside the SBC. The details of the experimental tomographic technique and the applied image reconstruction procedure are explained in previous publications.…”

Voronoï analysis of bubbly flows via ultrafast X-ray tomographic imaging

“…An operation rack to fix the scanner and to adjust the scanned objects as well as a measurement PC for data processing completes the system. It should be noted that the current equipment is a newly constructed scanner with increased capacity of measurement geometry up to column diameters of 160 mm in contrary to the previous scanner (Fischer et al 2008;Fischer and Hampel 2010;Hampel et al 2012). The maximum operating frequency is 8000 Hz, which is similar to the older scanner.…”

“…This measurement technique is developed by Fischer et al (2008) and has the ability to achieve a measurement frequency of up to 8000 Hz with a spatial resolution of approximately 1 mm. The advantage of the X-ray CT principle is its non-intrusive nature.…”

Homogeneous Gas‐Liquid Distribution for Monolithic Structures via a Needle Distributor

“…Based on this set of projections by using the common filtered back projection algorithm, a cross-sectional image can be reconstructed which is representing the material distribution inside the scanning area. High temporal resolution up to 7000 fps (frames per second) can be achieved, which enables the detection of hydrodynamic parameters of fast two-phase flows [27,32]. The X-ray tomography measurements were carried out in cooperation with the Helmholtz-Zentrum Dresden-Rossendorf e.V., where both monoliths were investigated by this technique.…”