Yusri Yunos - Academia.edu (original) (raw)

Papers by Yusri Yunos

Research paper thumbnail of Small Gas Component Detection using Ultrasonic Transmission-mode Tomography System

Jurnal Teknologi, 2014

This paper presents the development of an ultrasonic transmission-mode tomography system for the ... more This paper presents the development of an ultrasonic transmission-mode tomography system for the detection of small gas components by using higher frequency ultrasonic transducers. The selection of the transducer is important and must be suitable to the application design. Consideration on the natural limitation of ultrasonic wave is also noted as the higher the frequency of the ultrasonic transducer, the better the sensitivity but lower penetration depth. 16-pairs of these ultrasonic sensors are installed and fixed inside a sensor jig which is designed to hold all the sensors while providing support for optimum angle sensor placement. The sensor jig is also mounted on the circumference of a vertical column which will be used as the investigated process vessel. The developments presented also include the non-invasive fabrication techniques, the electronic measurement circuits, image reconstruction technique, and finally on the imaging results of the proposed system.

Research paper thumbnail of Simulative Studies on Ultrasound Interactions for Steel Pipe Transmission

Jurnal Teknologi, 2015

This paper presents the simulative studies on the use of ultrasonic sensors for steel pipe invest... more This paper presents the simulative studies on the use of ultrasonic sensors for steel pipe investigation. Using the acoustic impedance, calculations are done to estimate the propagated ultrasound signal based on its reflection and transmission percentage. The ultrasound wave propagation simulations are then further studied using a modeling software to simulate and visualize the wave interactions between different boundaries. Experiments done with real hardware have shown correlation with the numerical and simulation studies.

Research paper thumbnail of A Review on the Developments, Potentials and Challenges of Application of Metal Products and in Metal Industry Using Process Tomography System

Jurnal Teknologi, 2015

This paper will provide an overall view of the developments, potentials and challenges of industr... more This paper will provide an overall view of the developments, potentials and challenges of industrial applications involving metal products and in metal industry using process tomography system. The primary focus of the review is to highlight the differences occurred in process tomography in using metallic and non-metallic product especially involving the steel pipes which includes the differences in sensor arrangements (ERT, ECT, EIT), issues that arises in the use of metal and steel product besides in the metal production itself.

Research paper thumbnail of Magnetic Induction Tomography: A Brief Review

Jurnal Teknologi, 2015

Magnetic Induction Tomography (MIT) is a contactless non-invasive imaging technique that interest... more Magnetic Induction Tomography (MIT) is a contactless non-invasive imaging technique that interested in mapping the passive electrical properties of a material; conductivity, permittivity and permeability. This paper presents the criteria and previous functional specification involving the development of MIT, focusing in conductivity imaging. Various ways have been implemented from a simple electronic configuration of the front-end sensory circuit, data acquisition system, reconstruction algorithm and graphical user interfacing (GUI) tools. Induction sensors are paramount as it does provide the signal source for time varying magnetic field to the coils. The advantages and limitations of MIT are also presented. Many more advancement can be expected to enhance the lack of MIT especially in spatial resolution and dynamic response of the sensor.

Research paper thumbnail of Modeling orthogonal and rectilinear mixed-modality projection of optical tomography for solid-particles concentration measurement

Sensors and Actuators a-Physical, 2010

In optical tomography, light attenuation/scattering methods have been used to determine average s... more In optical tomography, light attenuation/scattering methods have been used to determine average solids concentrations in gas-solids flows. Derived from the Lambert–Beer law, the Mie theory forms the theoretical basis for optical sensor. It states that the intensity of light transmitted through a dilute gas–solids mixture should be exponentially related to the solids concentration in the light beam. In this context,

Research paper thumbnail of A Tomography System Using Optical-Fibre Sensors for Measuring Concentration and Velocity of Bubbles

Measurement and Control, 2001

Research paper thumbnail of Initial Result on Measurement of Gas Volumetric Flow Rate in Gas/Liquid Mixtures using Linear CCD Sensors

Jurnal Teknologi, 2008

Objektif utama penyelidikan ini adalah untuk melihat keberkesanan penderia CCD untuk mengesan, me... more Objektif utama penyelidikan ini adalah untuk melihat keberkesanan penderia CCD untuk mengesan, mengukur serta menghasilkan gambaran profil tomografi titisan minyak. Pada keseluruhannya instrumen yang akan dihasilkan berupaya mengukur kelajuan buih gas di dalam tangki. Kata kunci: Tomografi optik, penderia CCD, titisan minyak The aim of the project is to investigate the feasibility of using linear CCD sensors to detect, measure and produce tomographic images of the oil droplets. In the first instance, the instrument will measure gas bubbles in a water tank and estimate their size distribution and velocity. Key words: Optical tomography, CCD sensor, oil droplets

Research paper thumbnail of Infrared Tomography Sensor Configuration Using 4 Parallel Beam Projections

Jurnal Teknologi, 2011

Penyelidikan ini menunjukkan konfigurasi sensor tomografi optik dengan penggunaan pemancar infram... more Penyelidikan ini menunjukkan konfigurasi sensor tomografi optik dengan penggunaan pemancar inframerah dan foto transistor. Geometri unjuran sensor adalah berdasarkan kombinasi dua unjuran oktagon dan dua unjuran garis lurus tatasusunan. Sebuah perlengkapan direka untuk memegang keseluruhan pasangan pemancar–penerima secara selari. Pemilihan foto transistor juga dijelaskan supaya pembangunan sensor tomografi adalah bebas dari bacaan yang tidak diingini daripada persekitaran sekeliling. Penulisan ini juga menerangkan perkara–perkara yang perlu dipertimbangkan untuk pembangunan sensor tomografi optikal. Kata kunci: Inframerah; tomografi optikal This paper represents the configuration of optical tomography sensor by using infrared emitter and phototransistor. The projection geometry of the sensor is based on the combination of two orthogonal and two rectilinear projections arrays. A fixture is designed for holding all emitter–receiver pairs in parallel. Selection of phototransistor is e...

Research paper thumbnail of Design Consideration for Front-End System in Ultrasonic Tomography

Jurnal Teknologi, 2013

The hardware development of the ultrasonic tomography comprises three main parts; the sensor unit... more The hardware development of the ultrasonic tomography comprises three main parts; the sensor unit, electronic measurement circuits combined with a data acquisition system and finally the display unit. The research done is focusing on the design considerations for the sensory unit which is also regarded as the front-end system. This part is an important concern for researchers in the field of ultrasonic, particularly for process tomography. Ultrasonic transducers are very sensitive piezo-mechanical component and as such its installation to complete the front-end system have to be properly configured. Many considerations and parameters that are well planned will promise significant impact on the sensor readings. Measurement errors can occur due to many aspects, thus this research aims to minimize such errors to be useful for further development in ultrasonic tomography system design.

Research paper thumbnail of Design Of An Infrared Tomography System For Detection Of Bubbles

Jurnal Teknologi, 2011

Dalam kajian ini, sebuah sistem tomografi menggunakan penderia direka untuk digunakan untuk model... more Dalam kajian ini, sebuah sistem tomografi menggunakan penderia direka untuk digunakan untuk model paip menegak. Sistem tomografi ini akan digunakan untuk mengira jumlah buih sambil mengukur saiz buih yang terkandung dalam model paip yang diisi dengan air. Sistem ini akan direka bermula dari pemilihan jenis penderia optik sehinggalah ke teknik pemprosesan data. Penderia cahaya infra merah digunakan sebagai sumber cahaya untuk sistem ini. Sifat–sifat beberapa diod foto dikaji dan dibandingkan bagi memilih model yang sesuai untuk sistem ini. Mikro pengawal berfungsi untuk melakukan kerja penukaran isyarat analog ke digital. Beberapa eksperimen telah dijalankan bagi mengenal pasti prestasi sistem penderia tersebut. Hukum Lambert–Beer menyatakan bahawa atenuasi dan penyerapan cahaya berlaku apabila cahaya melintasi bahan yang berlainan. Beberapa eksperimen dijalankan bagi mengetahui sama ada sistem ini mampu mengesan buih dalam paip yang mengandungi air. Data yang diperoleh akan dibandin...

Research paper thumbnail of Image Reconstruction Using Iterative Transpose Algorithm for Optical Tomography

Jurnal Teknologi, 2007

This paper describes a transpose algorithm for use with an optical tomography system. The measure... more This paper describes a transpose algorithm for use with an optical tomography system. The measurement system consisted of two orthogonal arrays, each having ten parallel views, resulting in a total of twenty sensors. The measurement section is divided into hundred equi-sized pixels. The forward problem is modelled by allocating an optical attenuation coefficient to each pixel. The attenuation of incident collimated light beams is then modelled using the Lambert-Beer law. The inverse problem is defined and the transpose of the sensitivity matrix is used to obtain an estimate of the attenuation coefficients in each pixel. The iterative method is investigated as a means of improving reconstructed image quality.

Research paper thumbnail of Front End Development Of Optical Tomography And Its Linearity

Jurnal Teknologi, 2011

Pembangunan bahagian hadapan adalah penting di dalam tomografi optikal. Ia memberikan pandangan p... more Pembangunan bahagian hadapan adalah penting di dalam tomografi optikal. Ia memberikan pandangan pertama tentang bagaimana kebolehpercayaan sistem tomografi kepada pengukurannya. Oleh itu, litar penghantar dan penerima mesti dibina berhati-hati dengan analisis yang baik untuk setiap pemilihan unit komponennya. Kertas kerja ini akan menunjukkan kesan pembangunan litar kepada mutu kelinearannya. Tujuan kertas kerja ini adalah untuk membina litar penghantar dan penerima untuk aplikasi tomografi optikal. Ia dilakukan dengan mendapatkan unit voltan pada bahagian penerima setelah bertindak balas terhadap kewujudan penghalang yang mengganggu laluan cahaya di antara penghantar dan penerima. Reka bentuk eksperimen ini menggunakan penghalang dari jenis yang sama dengan perbezaan saiz di antara 0.5 hingga 3 mm. Daripada keputusan ia menunjukkan lebih besar objek, nilai bagi kehilangan voltan juga akan meningkat. Ini menunjukkan hubungan yang linear di antara kedua-dua parameter. Kata kunci: Tom...

Research paper thumbnail of Optical tomography: real-time velocity profile measurement using pixel-to-pixel and sensor-to-sensor method

Optical Engineering, 2006

We investigate the real-time velocity profile for optical tomography using the sensor-to-sensor (... more We investigate the real-time velocity profile for optical tomography using the sensor-to-sensor (STS) and pixel-to-pixel (PTP) methods. Although both methods are similar, the pixel-to-pixel velocity is more accurate than sensor-to-sensor velocity because it measures the pixel ...

Research paper thumbnail of Optical tomography: Velocity profile measurement using orthogonal and rectilinear arrangements

Flow Measurement and Instrumentation, 2012

In tomography applications, flow velocity is an important flow characteristic for analysis. Exces... more In tomography applications, flow velocity is an important flow characteristic for analysis. Excessively high particle velocity will cause high energy consumption, severe pipeline wear and particle degradation. This paper demonstrates a method of measuring velocity profile using the orthogonal and rectilinear sensors. Several experiments have been conducted to measure the velocity using those sensors and the results will be described at the end of the paper.

Research paper thumbnail of Initial Study on Optical Fiber Array to Produce Particle Size Information for Hydraulic Process

Arabian Journal for Science and Engineering, 2013

ABSTRACT Export Date: 10 September 2013, Source: Scopus

Research paper thumbnail of Infrared Tomography Sensor Configuration Using 4 Parallel Beam Projecions

3rd World Congress On Industrial Process Tomography, 2004

Research paper thumbnail of Initial Result on Measurement of Gas Volumetric Flow Rate in Gas/Liquid Mixtures using Linear CCD Sensors

Jurnal Teknologi, Jun 1, 2008

The aim of the project is to investigate the feasibility of using linear CCD sensors to detect, m... more The aim of the project is to investigate the feasibility of using linear CCD sensors to detect, measure and produce tomographic images of the oil droplets. In the first instance, the instrument will measure gas bubbles in a water tank and estimate their size distribution and velocity.

Research paper thumbnail of Small Gas Component Detection using Ultrasonic Transmission-mode Tomography System

Jurnal Teknologi, 2014

This paper presents the development of an ultrasonic transmission-mode tomography system for the ... more This paper presents the development of an ultrasonic transmission-mode tomography system for the detection of small gas components by using higher frequency ultrasonic transducers. The selection of the transducer is important and must be suitable to the application design. Consideration on the natural limitation of ultrasonic wave is also noted as the higher the frequency of the ultrasonic transducer, the better the sensitivity but lower penetration depth. 16-pairs of these ultrasonic sensors are installed and fixed inside a sensor jig which is designed to hold all the sensors while providing support for optimum angle sensor placement. The sensor jig is also mounted on the circumference of a vertical column which will be used as the investigated process vessel. The developments presented also include the non-invasive fabrication techniques, the electronic measurement circuits, image reconstruction technique, and finally on the imaging results of the proposed system.

Research paper thumbnail of Small Gas Component Detection using Ultrasonic Transmission-mode Tomography System

Jurnal Teknologi, 2014

This paper presents the development of an ultrasonic transmission-mode tomography system for the ... more This paper presents the development of an ultrasonic transmission-mode tomography system for the detection of small gas components by using higher frequency ultrasonic transducers. The selection of the transducer is important and must be suitable to the application design. Consideration on the natural limitation of ultrasonic wave is also noted as the higher the frequency of the ultrasonic transducer, the better the sensitivity but lower penetration depth. 16-pairs of these ultrasonic sensors are installed and fixed inside a sensor jig which is designed to hold all the sensors while providing support for optimum angle sensor placement. The sensor jig is also mounted on the circumference of a vertical column which will be used as the investigated process vessel. The developments presented also include the non-invasive fabrication techniques, the electronic measurement circuits, image reconstruction technique, and finally on the imaging results of the proposed system.

Research paper thumbnail of Simulative Studies on Ultrasound Interactions for Steel Pipe Transmission

Jurnal Teknologi, 2015

This paper presents the simulative studies on the use of ultrasonic sensors for steel pipe invest... more This paper presents the simulative studies on the use of ultrasonic sensors for steel pipe investigation. Using the acoustic impedance, calculations are done to estimate the propagated ultrasound signal based on its reflection and transmission percentage. The ultrasound wave propagation simulations are then further studied using a modeling software to simulate and visualize the wave interactions between different boundaries. Experiments done with real hardware have shown correlation with the numerical and simulation studies.

Research paper thumbnail of A Review on the Developments, Potentials and Challenges of Application of Metal Products and in Metal Industry Using Process Tomography System

Jurnal Teknologi, 2015

This paper will provide an overall view of the developments, potentials and challenges of industr... more This paper will provide an overall view of the developments, potentials and challenges of industrial applications involving metal products and in metal industry using process tomography system. The primary focus of the review is to highlight the differences occurred in process tomography in using metallic and non-metallic product especially involving the steel pipes which includes the differences in sensor arrangements (ERT, ECT, EIT), issues that arises in the use of metal and steel product besides in the metal production itself.

Research paper thumbnail of Magnetic Induction Tomography: A Brief Review

Jurnal Teknologi, 2015

Magnetic Induction Tomography (MIT) is a contactless non-invasive imaging technique that interest... more Magnetic Induction Tomography (MIT) is a contactless non-invasive imaging technique that interested in mapping the passive electrical properties of a material; conductivity, permittivity and permeability. This paper presents the criteria and previous functional specification involving the development of MIT, focusing in conductivity imaging. Various ways have been implemented from a simple electronic configuration of the front-end sensory circuit, data acquisition system, reconstruction algorithm and graphical user interfacing (GUI) tools. Induction sensors are paramount as it does provide the signal source for time varying magnetic field to the coils. The advantages and limitations of MIT are also presented. Many more advancement can be expected to enhance the lack of MIT especially in spatial resolution and dynamic response of the sensor.

Research paper thumbnail of Modeling orthogonal and rectilinear mixed-modality projection of optical tomography for solid-particles concentration measurement

Sensors and Actuators a-Physical, 2010

In optical tomography, light attenuation/scattering methods have been used to determine average s... more In optical tomography, light attenuation/scattering methods have been used to determine average solids concentrations in gas-solids flows. Derived from the Lambert–Beer law, the Mie theory forms the theoretical basis for optical sensor. It states that the intensity of light transmitted through a dilute gas–solids mixture should be exponentially related to the solids concentration in the light beam. In this context,

Research paper thumbnail of A Tomography System Using Optical-Fibre Sensors for Measuring Concentration and Velocity of Bubbles

Measurement and Control, 2001

Research paper thumbnail of Initial Result on Measurement of Gas Volumetric Flow Rate in Gas/Liquid Mixtures using Linear CCD Sensors

Jurnal Teknologi, 2008

Objektif utama penyelidikan ini adalah untuk melihat keberkesanan penderia CCD untuk mengesan, me... more Objektif utama penyelidikan ini adalah untuk melihat keberkesanan penderia CCD untuk mengesan, mengukur serta menghasilkan gambaran profil tomografi titisan minyak. Pada keseluruhannya instrumen yang akan dihasilkan berupaya mengukur kelajuan buih gas di dalam tangki. Kata kunci: Tomografi optik, penderia CCD, titisan minyak The aim of the project is to investigate the feasibility of using linear CCD sensors to detect, measure and produce tomographic images of the oil droplets. In the first instance, the instrument will measure gas bubbles in a water tank and estimate their size distribution and velocity. Key words: Optical tomography, CCD sensor, oil droplets

Research paper thumbnail of Infrared Tomography Sensor Configuration Using 4 Parallel Beam Projections

Jurnal Teknologi, 2011

Penyelidikan ini menunjukkan konfigurasi sensor tomografi optik dengan penggunaan pemancar infram... more Penyelidikan ini menunjukkan konfigurasi sensor tomografi optik dengan penggunaan pemancar inframerah dan foto transistor. Geometri unjuran sensor adalah berdasarkan kombinasi dua unjuran oktagon dan dua unjuran garis lurus tatasusunan. Sebuah perlengkapan direka untuk memegang keseluruhan pasangan pemancar–penerima secara selari. Pemilihan foto transistor juga dijelaskan supaya pembangunan sensor tomografi adalah bebas dari bacaan yang tidak diingini daripada persekitaran sekeliling. Penulisan ini juga menerangkan perkara–perkara yang perlu dipertimbangkan untuk pembangunan sensor tomografi optikal. Kata kunci: Inframerah; tomografi optikal This paper represents the configuration of optical tomography sensor by using infrared emitter and phototransistor. The projection geometry of the sensor is based on the combination of two orthogonal and two rectilinear projections arrays. A fixture is designed for holding all emitter–receiver pairs in parallel. Selection of phototransistor is e...

Research paper thumbnail of Design Consideration for Front-End System in Ultrasonic Tomography

Jurnal Teknologi, 2013

The hardware development of the ultrasonic tomography comprises three main parts; the sensor unit... more The hardware development of the ultrasonic tomography comprises three main parts; the sensor unit, electronic measurement circuits combined with a data acquisition system and finally the display unit. The research done is focusing on the design considerations for the sensory unit which is also regarded as the front-end system. This part is an important concern for researchers in the field of ultrasonic, particularly for process tomography. Ultrasonic transducers are very sensitive piezo-mechanical component and as such its installation to complete the front-end system have to be properly configured. Many considerations and parameters that are well planned will promise significant impact on the sensor readings. Measurement errors can occur due to many aspects, thus this research aims to minimize such errors to be useful for further development in ultrasonic tomography system design.

Research paper thumbnail of Design Of An Infrared Tomography System For Detection Of Bubbles

Jurnal Teknologi, 2011

Dalam kajian ini, sebuah sistem tomografi menggunakan penderia direka untuk digunakan untuk model... more Dalam kajian ini, sebuah sistem tomografi menggunakan penderia direka untuk digunakan untuk model paip menegak. Sistem tomografi ini akan digunakan untuk mengira jumlah buih sambil mengukur saiz buih yang terkandung dalam model paip yang diisi dengan air. Sistem ini akan direka bermula dari pemilihan jenis penderia optik sehinggalah ke teknik pemprosesan data. Penderia cahaya infra merah digunakan sebagai sumber cahaya untuk sistem ini. Sifat–sifat beberapa diod foto dikaji dan dibandingkan bagi memilih model yang sesuai untuk sistem ini. Mikro pengawal berfungsi untuk melakukan kerja penukaran isyarat analog ke digital. Beberapa eksperimen telah dijalankan bagi mengenal pasti prestasi sistem penderia tersebut. Hukum Lambert–Beer menyatakan bahawa atenuasi dan penyerapan cahaya berlaku apabila cahaya melintasi bahan yang berlainan. Beberapa eksperimen dijalankan bagi mengetahui sama ada sistem ini mampu mengesan buih dalam paip yang mengandungi air. Data yang diperoleh akan dibandin...

Research paper thumbnail of Image Reconstruction Using Iterative Transpose Algorithm for Optical Tomography

Jurnal Teknologi, 2007

This paper describes a transpose algorithm for use with an optical tomography system. The measure... more This paper describes a transpose algorithm for use with an optical tomography system. The measurement system consisted of two orthogonal arrays, each having ten parallel views, resulting in a total of twenty sensors. The measurement section is divided into hundred equi-sized pixels. The forward problem is modelled by allocating an optical attenuation coefficient to each pixel. The attenuation of incident collimated light beams is then modelled using the Lambert-Beer law. The inverse problem is defined and the transpose of the sensitivity matrix is used to obtain an estimate of the attenuation coefficients in each pixel. The iterative method is investigated as a means of improving reconstructed image quality.

Research paper thumbnail of Front End Development Of Optical Tomography And Its Linearity

Jurnal Teknologi, 2011

Pembangunan bahagian hadapan adalah penting di dalam tomografi optikal. Ia memberikan pandangan p... more Pembangunan bahagian hadapan adalah penting di dalam tomografi optikal. Ia memberikan pandangan pertama tentang bagaimana kebolehpercayaan sistem tomografi kepada pengukurannya. Oleh itu, litar penghantar dan penerima mesti dibina berhati-hati dengan analisis yang baik untuk setiap pemilihan unit komponennya. Kertas kerja ini akan menunjukkan kesan pembangunan litar kepada mutu kelinearannya. Tujuan kertas kerja ini adalah untuk membina litar penghantar dan penerima untuk aplikasi tomografi optikal. Ia dilakukan dengan mendapatkan unit voltan pada bahagian penerima setelah bertindak balas terhadap kewujudan penghalang yang mengganggu laluan cahaya di antara penghantar dan penerima. Reka bentuk eksperimen ini menggunakan penghalang dari jenis yang sama dengan perbezaan saiz di antara 0.5 hingga 3 mm. Daripada keputusan ia menunjukkan lebih besar objek, nilai bagi kehilangan voltan juga akan meningkat. Ini menunjukkan hubungan yang linear di antara kedua-dua parameter. Kata kunci: Tom...

Research paper thumbnail of Optical tomography: real-time velocity profile measurement using pixel-to-pixel and sensor-to-sensor method

Optical Engineering, 2006

We investigate the real-time velocity profile for optical tomography using the sensor-to-sensor (... more We investigate the real-time velocity profile for optical tomography using the sensor-to-sensor (STS) and pixel-to-pixel (PTP) methods. Although both methods are similar, the pixel-to-pixel velocity is more accurate than sensor-to-sensor velocity because it measures the pixel ...

Research paper thumbnail of Optical tomography: Velocity profile measurement using orthogonal and rectilinear arrangements

Flow Measurement and Instrumentation, 2012

In tomography applications, flow velocity is an important flow characteristic for analysis. Exces... more In tomography applications, flow velocity is an important flow characteristic for analysis. Excessively high particle velocity will cause high energy consumption, severe pipeline wear and particle degradation. This paper demonstrates a method of measuring velocity profile using the orthogonal and rectilinear sensors. Several experiments have been conducted to measure the velocity using those sensors and the results will be described at the end of the paper.

Research paper thumbnail of Initial Study on Optical Fiber Array to Produce Particle Size Information for Hydraulic Process

Arabian Journal for Science and Engineering, 2013

ABSTRACT Export Date: 10 September 2013, Source: Scopus

Research paper thumbnail of Infrared Tomography Sensor Configuration Using 4 Parallel Beam Projecions

3rd World Congress On Industrial Process Tomography, 2004

Research paper thumbnail of Initial Result on Measurement of Gas Volumetric Flow Rate in Gas/Liquid Mixtures using Linear CCD Sensors

Jurnal Teknologi, Jun 1, 2008

The aim of the project is to investigate the feasibility of using linear CCD sensors to detect, m... more The aim of the project is to investigate the feasibility of using linear CCD sensors to detect, measure and produce tomographic images of the oil droplets. In the first instance, the instrument will measure gas bubbles in a water tank and estimate their size distribution and velocity.

Research paper thumbnail of Small Gas Component Detection using Ultrasonic Transmission-mode Tomography System

Jurnal Teknologi, 2014

This paper presents the development of an ultrasonic transmission-mode tomography system for the ... more This paper presents the development of an ultrasonic transmission-mode tomography system for the detection of small gas components by using higher frequency ultrasonic transducers. The selection of the transducer is important and must be suitable to the application design. Consideration on the natural limitation of ultrasonic wave is also noted as the higher the frequency of the ultrasonic transducer, the better the sensitivity but lower penetration depth. 16-pairs of these ultrasonic sensors are installed and fixed inside a sensor jig which is designed to hold all the sensors while providing support for optimum angle sensor placement. The sensor jig is also mounted on the circumference of a vertical column which will be used as the investigated process vessel. The developments presented also include the non-invasive fabrication techniques, the electronic measurement circuits, image reconstruction technique, and finally on the imaging results of the proposed system.