Development and characterization of a neutron tomography system for a Research Reactor

Satu sistem tomografi monokromatik neutron telah direka bentuk di reaktor penyelidikan 1MW TRIGA MARK II milik Agensi Nuklear Malaysia (Nuklear Malaysia) yang terletak di Bangi, Selangor. Kamera CCD digunakan dalam proses pengumpulan data dan sistem ini dinilai dengan menggunakan palam pencucuh. Pembinaan semula imej dijalankan berasaskan kaedah filtered back-projection dan lelaran. Keseluruhannya, 25 data projeksi digunakan dalam proses pembinaan semula imej. Kata kunci: Monokromatik, tomografi neutron, kamera CCD, filtered back–projection, lelaran, pembinaan semula imej A new monochromatic neutron tomography system was built utilizing the Malaysia Nuclear Agency 1MW TRIGA MARK II research reactor located at Bangi, Selangor. The CCD camera was used in data capturing and the system was evaluated using an experimental phantom made from spark plug. Reconstruction was based on the filtered back-projection and the iterative approach. Altogether 25 projections were used in the reconstruction and results discussed. Key words: Monochromatic, neutron tomography, CCD camera, filtered back–projection, iterative, image reconstruction

Download Full-text

Ultrasonic Time-of-Flight Computed Tomography for Investigation of Batch Crystallisation Processes

Sensors ◽

10.3390/s21020639 ◽

2021 ◽

Vol 21 (2) ◽

pp. 639

Author(s):

Panagiotis Koulountzios ◽

Tomasz Rymarczyk ◽

Manuchehr Soleimani

Keyword(s):

Spatial Information ◽

Injection Rate ◽

Ultrasound Tomography ◽

Measurement Systems ◽

Process Dynamics ◽

Tomography System ◽

Ultrasonic Time ◽

Crystallisation Process ◽

Liquid Suspensions

Crystallisation is a crucial step in many industrial processes. Many sensors are being investigated for monitoring such processes to enhance the efficiency of them. Ultrasound techniques have been used for particle sizing characterization of liquid suspensions, in crystallisation process. An ultrasound tomography system with an array of ultrasound sensors can provide spatial information inside the process when compared to single-measurement systems. In this study, the batch crystallisation experiments have been conducted in a lab-scale reactor in calcium carbonate crystallisation. Real-time ultrasound tomographic imaging is done via a contactless ultrasound tomography sensor array. The effect of the injection rate and the stirring speed was considered as two control parameters in these crystallisation functions. Transmission mode ultrasound tomography comprises 32 piezoelectric transducers with central frequency of 40 kHz has been used. The process-based experimental investigation shows the capability of the proposed ultrasound tomography system for crystallisation process monitoring. Information on process dynamics, as well as process malfunction, can be obtained via the ultrasound tomography system.

Download Full-text

FIB-SEM Three-Dimensional Tomography for Characterization of Carbon-Based Materials

Advances in Materials Science and Engineering ◽

10.1155/2019/8680715 ◽

2019 ◽

Vol 2019 ◽

pp. 1-8 ◽

Cited By ~ 2

Author(s):

Nan Nan ◽

Jingxin Wang

Keyword(s):

Focused Ion Beam ◽

Ion Beam ◽

Three Dimensional ◽

3D Tomography ◽

Tomography System ◽

Internal Structures ◽

Potential Applications ◽

Scanning Electron ◽

Carbon Based

A review on the recent advances of the three-dimensional (3D) characterization of carbon-based materials was conducted by focused ion beam-scanning electron microscope (FIB-SEM) tomography. Current studies and further potential applications of the FIB-SEM 3D tomography technique for carbon-based materials were discussed. The goal of this paper is to highlight the advances of FIB-SEM 3D reconstruction to reveal the high and accurate resolution of internal structures of carbon-based materials and provide suggestions for the adoption and improvement of the FIB-SEM tomography system for a broad carbon-based research to achieve the best examination performances and enhance the development of innovative carbon-based materials.

Download Full-text