An investigation on chemical bubble column using ultrasonic tomography for imaging of gas profiles

Rahiman, Mohd Hafiz Fazalul; Rahim, Ruzairi Abdul; Rahim, Herlina Abdul; Mohamad, Elmy Johana; Zakaria, Zulkarnay; Muji, Siti Zarina Mohd

doi:10.1016/j.snb.2014.05.043

Cited by 25 publications

(7 citation statements)

References 21 publications

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“…The capability of ultrasonic tomography to visualise the internal conditions of the pipe had been proven by Rahiman et al (2014) which was based on the time-flight and arrival-time of ultrasonic signals from the transmitter and the receiver. On the other hand, this project's output data was observed from the difference responses of the ultrasonic signals in terms of amplitude when it travelled through different mediums.…”

Section: Image Of Irregularitiesmentioning

confidence: 99%

Pipe irregularities mapping using tomographic instrumentation system

Zakaria¹,

Idroas²,

Ramli³

et al. 2021

J. Petroleum Gas Eng.

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Formation of irregularities on the inner surface of pipes is a common phenomenon that leads to corrosion and affects the functionality in the processing industries. Ultrasonic is known as one of the non-destructive means to address the formation of irregularities inside pipes. In this study, an ultrasonic measurement system is developed to detect the presence of internal irregularities in a pipe. An ultrasonic sensor EFC16T/R-2 with a frequency of 40 kHz was mounted outside the test pipe with a circular ring sensor unit. Different conditions of the inner pipe surface had caused fluctuations of the ultrasonic signal. The results show a low output voltage in the range of 2.1333 to 3.1334 V when no irregularities were detected. A higher output voltage was observed in the range of 5.4677 to 8.8667 V when irregularities occurred. The reconstructed images of irregularities had matched the actual condition of the pipe. Some images showed a slight inaccuracy of the position of the irregularities caused by the instability of the ultrasonic signals. Overall, the developed ultrasonic tomography is suitable as a tool for monitoring irregularities in a pipe.

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Section: Image Of Irregularitiesmentioning

confidence: 99%

Pipe irregularities mapping using tomographic instrumentation system

Zakaria¹,

Idroas²,

Ramli³

et al. 2021

J. Petroleum Gas Eng.

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show abstract

“…only the transmission signal is used for imaging. In UTT, the amplitude or timeof-flight (TOF) measurement of the received wave is used for imaging based on the assumption of straight-line propagation [20,36]. As an ultrasonic signal propagates with different speeds in different materials, the material distribution inside the ROI can influence its straight-line propagation time, which is termed as TOF.…”

Section: Ultrasonic Transmission Tomography (Utt)mentioning

confidence: 99%

“…According to this statement, imaging can be implemented by measuring the TOF of ultrasonic signals between transducers, which is the UT methodology utilized in this work. Meanwhile, the fan-shaped ultrasonic beam projection allows simultaneous interrogation of a large area, ensuring the maximum number of sensors receive the directly transmitted signals in every beam projection [36].…”

Section: Ultrasonic Transmission Tomography (Utt)mentioning

confidence: 99%

Contactless electrical impedance and ultrasonic tomography: correlation, comparison and complementarity study

Jiang

Soleimani

Wang

2019

Meas. Sci. Technol.

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Electrical tomography (ET) and ultrasonic tomography (UT) techniques are effective and promising super-sensing tools with uses in many industrial process applications. They can create internal mapping images of both electrical and mechanical properties from measurements at the exterior boundaries of domains of interests. There are several different types of ET methods and different modes of UT imaging. Here we focus on contactless ET and contactless UT imaging for liquid masses, enabling fully non-intrusive, integrated mechanical and electrical imaging because direct contact to the process material is often a major limiting factor. ET is sensitive to the distribution of dielectric parameters inside the region of interest, and the highest sensitivity often lies near the outer surface of the boundary. UT has very good responses to the intersections of different phases of materials and has the highest resolution in the central area. Capacitively coupled electrical impedance tomography (CCEIT) is proposed as a contactless ET technique. This work investigates CCEIT based on phase measurements of the electrical impedance between transmitting and receiving electrodes, and UT based on the transmission mode, measuring the time-of-flight between the transmitted signal and the first received signals. A combined sensor which comprises a 16-electrode CCEIT array and a 16-transducer UT array is developed. Experimental results show the performances of the two tomography systems and their dual modality combination. This work highlights various aspects of the correlation, comparison and complementarity between these two contactless imaging techniques. Inclusion material characterization and identification is demonstrated using this novel dual modality.

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“…In equation ( 2), the calculation of coefficient matrix R is crucial to the reconstruction, the reconstruction quality will be consequently affected by the coefficient matrix. The most effective methods assembling matrix R is mainly through the concept of ''area ratio'' (Rahiman et al, 2014), that is, the value of elements in the matrix R is calculated as the ratio of the area that projection path covered on the pixel unit to the area of whole pixel unit itself.…”

Section: Basic Model Of Utmentioning

confidence: 99%

Continuous-wave ultrasonic tomography for oil/water two-phase flow imaging using regularized weighted least square framework

Líu

Tan

2019

Transactions of the Institute of Measurement and Control

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Two-phase flow is a regime that commonly existed in many applications of process industry, on which the technique of ultrasonic tomography (UT) could provide reliable measurement with benefits of non-invasion, non-radiation and low-cost. In order to provide considerable visualization of low acoustic impedance contrast configurations in two-phase flow, a regular weighted simultaneous algebraic reconstruction technique (RW-SART) using continuous-wave excitation is proposed and presented in detail. With measurement strategy and formulized reconstruction model introduced, the measurement system is introduced with modification on continuous-wave excitation module and fan-beam angle transducers. A regularized weighted least square (RWLS) framework combining total variation (TV) regularization and SART reconstruction is derived and presented in detail to address the problem that under-determined and ill-conditioned situation couldn’t be resolved simultaneously. Both numerical simulation and experimental investigation are conducted to validate the feasibility of continuous-wave excitation and the improvement of proposed reconstruction strategy, from which the distribution of oil-water two-phase flow is effectively reconstructed. The implementation of measurement system provides an option of continuous high-voltage excitation and measurement in UT. By utilizing both the geometric information and penalty constraint, the proposed reconstruction approach provides a framework that introduces regularization information to the algebraic iteration reconstruction. Consequently, it has better reconstruction result than TV, Landweber, L1, filtered back projection (FBP) and SART method.

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An investigation on chemical bubble column using ultrasonic tomography for imaging of gas profiles

Cited by 25 publications

References 21 publications

Pipe irregularities mapping using tomographic instrumentation system

Pipe irregularities mapping using tomographic instrumentation system

Contactless electrical impedance and ultrasonic tomography: correlation, comparison and complementarity study

Continuous-wave ultrasonic tomography for oil/water two-phase flow imaging using regularized weighted least square framework

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