A new CdZnTe detector system for low-energy gamma-ray measurement

Johansen, Geir Anton; Åbro, E.

doi:10.1016/s0924-4247(97)80010-6

Cited by 13 publications

(6 citation statements)

References 8 publications

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“…CdZnTe semiconductor detectors offer a good signal-to-noise ratio and short response time, in addition to high stopping efficiency at the selected gamma-ray energy. The CdZnTe semiconductor detectors are operated in pulse mode, with a read-out system optimized for high count rates with a peaking time of only 200 ns [12].…”

Section: B Gamma-ray Tomographymentioning

confidence: 99%

Multimodal analysis of gas-oil intermittent structures in co-current horizontal flow

Stavland

Arellano

Hunt³

et al. 2020

2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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Section: B Gamma-ray Tomographymentioning

confidence: 99%

Multimodal analysis of gas-oil intermittent structures in co-current horizontal flow

Stavland

Arellano

Hunt³

et al. 2020

2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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Section: A Electrical Capacitance Tomography (Ect)mentioning

confidence: 99%

Multimodal Two-Phase Flow Measurement Using Dual Plane ECT and GRT

Stavland

Arellano

Hunt³

et al. 2021

IEEE Trans. Instrum. Meas.

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The present work assesses the accuracy two phase flow measurement, based on cross-correlation and cross-spectrum velocity computation, using dual plane non-intrusive Electrical Capacitance Tomography (ECT), over a broad spectrum of horizontal flow configurations, combined with fraction distribution measurements from Gamma-ray Tomography (GRT). The measurement of two-phase flow encompasses the measurement of both the velocity and the phase concentration of the flow components. The accuracy of the flow velocity is still an open discussion and remains a key challenge in the field of multiphase flow measurement. The velocities of the two-phase components vary, both in between them, and across the pipe crosssection. This study assesses the use of cross-correlation techniques as methods for calculating the cross-sectional velocity distribution by deriving the transit time of the fluid flowing through two parallel ECT sensor arrays mounted on the perimeter of a pipe. The spectral distribution of the velocities is assessed for improved accuracy of individual component velocities. A dual-plane ECT is adopted for the velocity measurements and are combined with state-of-the-art density-based cross-sectional phase fraction distribution from a GRT system to measure the volumetric flow rates of the two phases. The results show that the cross-spectrum method provides enhanced velocity estimation for both flow phases over the conventional cross-correlation technique. Further improvement was reported using a simple predictive correction model resulting in flowrate estimation accuracy of ±10%.The method for two-phase flow measurement suggested in this work leverages the accuracy of the tomography systems on accurate fraction measurement and fast data acquisition to lead to potential enhancement in process control by enabling a more accurate prediction of components velocities.

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“…This is important in γ -ray tomography because the detectors need to be tightly stacked in arrays [9]. For this reason CdZnTe semiconductor detector technology, which also has undergone substantial improvements in recent years, was used in this project [10,11]. Finally, it is worthwhile noting that the reduced risk involved with the 241 Am isotope in comparison to that with 137 Cs, for example, may simplify the process of approval in various industrial applications.…”

Section: Accuracy Versus Safetymentioning

confidence: 99%

A dual sensor flow imaging tomographic system

Johansen

Frøystein

Hjertaker

et al. 1996

Meas. Sci. Technol.

120

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A dual sensor tomograph for three-component flow imaging has been built at the University of Bergen in cooperation with Christian Michelsen Research AS and Norsk Hydro AS. It utilizes an eight-electrode electrical capacitance tomograph and a γ-ray tomograph with five radiation sources and 85 compact detectors. Embedded transputers using memory-mapped I/O ensure high-speed data acquisition into an Alpha AXP-based on-line processing unit. The first results demonstrate that three-component flow regime identification is possible at rates of about 30 frames per second, provided that sufficient computing capability is available.

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A new CdZnTe detector system for low-energy gamma-ray measurement

Cited by 13 publications

References 8 publications

Multimodal analysis of gas-oil intermittent structures in co-current horizontal flow

Multimodal analysis of gas-oil intermittent structures in co-current horizontal flow

Multimodal Two-Phase Flow Measurement Using Dual Plane ECT and GRT

A dual sensor flow imaging tomographic system

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