Journal of Tomography System and Sensor Application

Investigation of piezoelectric harvester performance for several shape of piezoelectric using finite element method

2023-08-13T09:24:51+00:00

Energy harvesting is a prominent means of ensuring energy sustainability and among popular source to be harvest is the rainfall for the water supply and also electric from the vibration of the rain drops. Raindrop vibration is commonly harvested using piezoelectric method; hence a specific piezoelectric structure is required to properly convert vibration to electric output. Usually, a cantilever beam structure piezoelectric is used as converter element. For maximum power output, the piezoelectric cantilever beam must generate frequency vibration near at its resonant frequency. However, the cantilever beam structure has several types of shape that can generate different output at their resonant frequency. Further investigation on several geometries of piezoelectric energy harvesters is simulated using COMSOL software in order to select suitable design with maximum power generating performance. This paper present four different geometries of piezoelectric energy harvester which are basic shape, T shape, trapezoidal shape and exponential shape. The output voltage and current were investigated to obtain the optimum output based on the result of the simulation. The results indicated that the trapezoidal shape width 24mm produced the largest power which is 36.83%, 63.04 % and 78.80 % than basic shape width 16mm, T shape width 24mm and exponential shape width 32mm that generated power output at eigen frequency mode 1.

Simulation Study of Ultrasonic Tomography Approach in Detecting Foreign Object in Milk Packaging

2023-08-13T09:10:37+00:00

Contaminant issues are one of the major concerns in food and beverages (F&B) industries because it compromises the product and brand. In general, there are three types of food and beverages contaminant, which are biological, chemical, and physical hazards. The physical hazard is the most common occurred in the F&B manufacturing industries. The current application of solid contamination detector such as X-Ray machine and metal detector involves hazardous radiation. Therefore, tomography approach is proposed due to its ability to detect contamination with less or little hazardous radiation. This research focuses on non-invasive and non-intrusive tomography techniques to detect foreign objects without affecting the ingredient and the original form of food. Moreover, a simulation will be performed to detect the existence of foreign objects in small milk carton using ultrasonic tomography approach via COMSOL Multiphysics software. This paper discusses the conceptual modelling design of ultrasonic tomography approach and the analysis of its voltage output. 1 mm size of foreign object is deliberately put inside the milk packaging. The results show that the proposed conceptual modelling can identify the existence of foreign object in the homogenous milk medium.

Attenuation Field Estimation Using Radio Tomography in the different system Models

2023-08-13T08:59:45+00:00

This study presents a difference between the circle and square model of the RTI system in the monitoring area for localization. the formation of human localization and its uses, detection, monitoring, and quality determination, as the concerns of this research are to detect human and employ an efficient method to monitor and quantify the many objects in a zone by using different systems models which are the circle and square model. Tomographic imaging techniques have been selected as meeting the requirement to be harmless, non-invasive, non-destructive, and capable of visualizing the object inside the monitoring area. A comparison among the frequencies is done for the different algorithms and it is found that the Gaussian algorithm has the highest value overall for both the circle and square system model. MSSIM shows that the difference in the reading the highest of the circle model was 0.791 using the Gaussian algorithm and the highest of the square model was 0.81 using the Gaussian algorithm.

Initial Study of Electrical Capacitance Tomography for Detecting Agarwood

2023-08-13T09:01:11+00:00

This study investigates the use of electrical capacitance tomography (ECT) as a non-invasive method to monitor the quantity of agarwood in a tree. Previous methods like sonic, magnetic inductive, and microwave tomography have been used, but it's unclear if voltage variations in resin regions are significant. The ECT system was developed using COMSOL Multiphysics software, modeling 8 electrodes in a 2-dimensional setup. The electrical potential distribution and performance analysis of the ECT model were evaluated for different agarwood locations, shapes, and sizes. The forward problem was solved using COMSOL, and tomogram images were obtained using a linear back-projection algorithm in MATLAB. The images closely matched the reference image based on the mean structural similarity index (MSSIM) values. This suggests the potential for accurately reconstructing agarwood images using ECT.