Hardware development of dual-modality tomography using electrical resistance and ultrasonic transmission tomography for imaging liquid and gas

• Main Authors: Mohd. Yunus, Fazlul Rahman, Ridzuan Aw, Suzanna, Abdul Rahim, Ruzairi, Leow, Pei Ling, Rahiman, Mohd. Hafiz Fazalul, Abdul Wahab, Yasmin, Nor Ayob, Nor Muzakir, Mohammad Din, Shahrulnizahani, Puspanathan, Jaysuman
• Format: Conference or Workshop Item
• Published: 2022
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utm.my/id/eprint/100736/; http://dx.doi.org/10.1007/978-981-19-3923-5_68

In decades, single-modality technique focuses on particular application such as liquid/gas, gas/solid, liquid/liquid and liquid/solid which has drawbacks in imaging complex flow with multiple components. This paper focuses on the development of dual-modality tomography system (DMT) integrating ultrasonic tomography and electrical resistance tomography (ERT) to visualize cross-sectional images of two-phase liquid/gas in vertical column. A combination of soft-field and hard-field tomography system measures different physical parameters of two-phase liquid/gas specific of two different material properties which are conductivity (σ) and acoustics impedance (Z). A DMT system is developed with 16 units of ultrasonic transceiver sensors, and 16 units of ERT electrode positioned alternately on a single-plane arrangement to perform measurement simultaneously. The reconstructed tomographic images obtained from measurement data from these two modalities are then fused into a single tomographic image by employing discrete wavelet transform (DWT).