Lens integrated laser based optical tomography system with back-projection algorithm

This research investigates the methods of implementing switch mode parallel beam projection technique into optical tomography instrument, and observes the effects of lens in optical system tomography. In addition, the research is focused on measuring the maximum size of phantom that can be captured for concentration profile. There are two types of sources that are used in tomography system which are high and low radiation sources. In this research, low radiation source is used as a medium to measure phantom inside the pipe. There are many types of components that produce light including the light-emitting diode (LED), infrared and laser. The tests are done using laser. Pipe has 100 mm inner diameter and the convex lens is applied in front of light component to change the angle of the transmitted light. The received light is captured by the sensor for further analysis to determine phantom inside the pipe region. Result shows that the optical tomography combine with lens is easier to manage the coverage of region. The results indicate that the proposed system is suitable for object application range between 8 mm to 80 mm

Application study on bubble detection in a metallic bubble column using electrical resistance tomography

Electrical resistance tomography (ERT) has been chosen as the field of study because of its advantages of being low cost, suitable for various kinds and sizes of pipes and vessels, having no radiation hazard, and being non-intrusive. In the development of ERT systems for metallic bubble column, prior knowledge of the fundamental process of the ERT system whilst improving the design and operation of the process equipment is essential. The fabricated electrodes need to be electrically insulated from the metal wall. Besides that, conducting boundary strategy is implemented to overcome the grounding effect of the metallic vesse

Initial results on medium frequency electromagnetic field penetration in biological soft tissue

Therapy is among the oldest medication technique in maintaining the health of the body especially from bad blood circulation, stroke and several others. This technique includes acupuncture, guasa and also massage. There are also modern therapy techniques like colour therapy, water therapy, ozone therapy, drug therapy and others. This paper will highlight electromagnetic therapy generator, a device which has the potential of therapy application in medical field. This device produce medium frequency magnetic field as a therapy source. This small scale medium frequency and low cost hardware that has been developed was tested on the biological tissue for the purpose of measuring the magnetic field penetration. The testing has proven that the generated magnetic field is able to penetrate the soft tissue up to 2 cm with distance from the source up to 7 cm. The capability of the system penetrations through the soft tissues provide the bright future of this research since magnetic field have shown the potential as being part of the therapy for curing migraine, stroke, cramp and several others besides the application in the magnetic induction tomography imaging

Hardware design of laser optical tomography system for detection of bubbles column

This paper presents a hardware design and optical tomography application for fast cross sectional detection of single or two phase flows in pipes or bubble columns. Sixteen laser pointer transmitters and photodiode receivers are arranged at the object cross sectional boundary to detect the existence of bubbles inside a vertical column pipeline. A valve is installed at the bottom of the pipe to produce the source of bubbles. Due to the simple operation, good heat transfer and mass transfer of bubble columns, they can be applied in a wide range of applications in the chemical process industry. The size of the bubbles produced was estimated to be between 5 mm and 20 mm in diameter. The voltage drop at the sensor directly shows the existence of bubbles between the transmitter and receiver

Octagon modelling using parallel projection of optical tomography

This paper presents a hardware design, arrangement and measurement for optical tomography where optical tomography uses light sources as the transmitter and photodiodes as the receiver. By using parallel projection for 44 laser transmitters and photodiode receivers at the cross-sectional boundary, the existence of bubbles inside a vertical column pipeline is determined. Octagon modelling with an eight-sided jig is used for projection and the measurement method for this research is shown. An offline technique is used to collect readings from each signal and the image is reconstructed from the data received

Measurement of the content of water using light penetration

In this paper we use an electronic component to produce light which is applied in testing soft tissue penetration. We used bio tissue, a slice of apple, and non-bio tissue, paper. The voltage could be adjusted to brighten the light to view the penetration of the subject. The thickness of the tissue was constant and the results showed that the current and voltage were significant as the light penetrated the soft tissue

Simulation Study of Bubble Detection Using Dual-Mode Electrical Resistance and Ultrasonic Transmission Tomography for Two-Phase Liquid and Gas

Tomography is a process of imaging parameters in industrial applications. It can be based on different sensing methods; ultrasound and electrical impedance sensing methods are both sensitive to the particular characteristics of a material. These imaging methods have been shown to be practical instruments for process monitoring in the process industry. However the achieved image can be low in quality and restricted in resolution due to ill-posedness of the inverse problems and limited data. To further enhance the spectral images, this paper proposed combination of ultrasound transmission tomography (UTT) and electrical resistance tomography (ERT) to monitor a static two-phase liquid and gas. This paper presents the modeling approach for three dimensional (3D) geometries with linear finite element method (FEM) using COMSOL multiphysics. The modeling approach is aimed to determine the ability of dual-modality system in detecting bubbles with different sizes located at the center medium in acrylic vessel. Simulation results showed that the dual-modality system has the potential and can be implemented as alternative technique to visualize bubble with minimum radius of 5 mm located at center of the acrylic vessel