“…Opielinski and Gudra (2006) used a transmission system with two pairs of moveable transmitters and receivers to detect multiple solid objects of varying shapes in a gas system. The Malaysia researchers Abdul Rahim and Fazalul Rahiman have many published articles on a transmission ultrasound tomography system using a fan-beamed transducer to image bubbles in flow and classify different types of liquid gas flows such as plug, stratified and annular (Figure 9.10) (Abdul Rahim et al, 2005Abdul Wahab, Abdul Rahim, Fazalul Rahiman, & Ahmad, 2011;Fazalul Rahiman et al, 2006Fazalul Rahiman, Abdul Rahim, Abdul Rahim, Muji, & Mohamad, 2012). This ultrasound tomography system was also capable of imaging gas and solids in the same fluid continuum (Abdul Wahad et al, 2011) and was used to image the quantity of oil and water flowing in a pipe by measuring the received signal voltage (Abdul Rahim, Nyap, Fazalul Rahiman, & San, 2007).…”