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Compact high-resolution gamma-ray computed tomography system for multiphase flow studies
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Image of FIG. 1.
FIG. 1.

Completely assembled CompaCT detector module.

Image of FIG. 2.
FIG. 2.

Signal processing scheme of the CompaCT radiation detector.

Image of FIG. 3.
FIG. 3.

(a) CAD drawing of the detector base plate showing the channels for heat-removal by convective cooling. (b) Photo of the thermal control system with controller unit and cooling tower at one end of the detector arc.

Image of FIG. 4.
FIG. 4.

Interior of the CompaCT detector arc.

Image of FIG. 5.
FIG. 5.

(a) Drawing of the isotopic capsule. (b) Design of the Densimet® isotopic source collimator and (c) its sectional view.

Image of FIG. 6.
FIG. 6.

Measured spectrum of a single collimated scintillation detector element.

Image of FIG. 7.
FIG. 7.

(a) Setup and (b) normalised count rate distribution of nine detectors of the CompaCT system, where only the detector element 0 in the centre was exposed.

Image of FIG. 8.
FIG. 8.

(a) Measured mean radiation attenuation characteristic curve with various aluminium plates and in comparison with and without dark count rate consideration and (b) with alternative lower threshold values.

Image of FIG. 9.
FIG. 9.

(a) MTF at the edge area of the reconstructed aluminium block scanned with the CompaCT and (b) scanned aluminium strut profile with 60 × 60 mm2 outer dimension.

Image of FIG. 10.
FIG. 10.

Fixed packaged bed reactor assembly with glass beads (left), its reconstruction with 2 mm and with 4 mm glass beads (right, top), and corresponding attenuation profiles (bottom).

Image of FIG. 11.
FIG. 11.

(a) Sketch and (b) photo of the scanned partially liquid-filled horizontal axially rotated packed bed assembly to study the capability of the CompaCT to reveal different flow regimes in tubular flow systems.

Image of FIG. 12.
FIG. 12.

Horizontally positioned packed bed assembly for (a) a 4 mm glass beads bed, 35% liquid holdup, and (d), (i), and (l) various rotational speeds and two 2.5 mm glass beads beds with (b) 30% liquid holdup and (e), (g), (j), and (m) various rotational speeds, and (c) 60% liquid holdup and (f), (h), (k), and (n) various rotational speeds.


Generic image for table
Table I.

Most important system parameters of the CompaCT.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Compact high-resolution gamma-ray computed tomography system for multiphase flow studies