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RISS 인기검색어
- 검색키워드
- 저자 : Mohd Hafiz Fazalul Rahiman (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Initial Study of a Wire Mesh Tomography Sensor for Liquid/Gas Component Investigation
Mohd Hafiz Fazalul Rahiman,Siow Lean Thiam,Ruzairi Abdul Rahim,Zulkarnay Zakaria,Vernoon Ang Wei Neng 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.5
Experimental studies have been carried out to study the principle operation of the conductive type wire-mesh tomography sensor and analyse the wire-mesh tomography sensor for the liquid/gas two-phase flow interface and void fraction distribution in a process column. The measurement of the two-phase flows in the process column is based on the cross-sectional local instantaneous conductivity. The sensor consists of two planes of parallel electrode wires with 16 electrodes each and was placed orthogonally with each plane. The sensor electrode wires were made of tinned copper wire with an outer diameter of 0.91 mm which stretched over the sensor fixture. Therefore, this result in the mesh grid size with 5.53×5.53mm². The wire-mesh sensor was tested in a horizontal liquid/gas two-phase flows process column with nominal diameter of 95.6 mm and the sampling frequency of 5882.3529 Hz. The tomogram results show that the wire-mesh tomography provides significant results to represent the void fraction distribution in the process column and estimation error was found in the liquid/gas interface level.
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A Design and Development of a Wireless Sensor Network for Potential Monitoring and Localization
Nurul Amira Mohd Ramli,Mohd Hafiz Fazalul Rahiman,Muhammad Faiz Abdul Malik,Latifah Munirah Kamarudin,Latifah Mohamed,Ammar Zakaria,Mohammed Saeed Moqbel Abdullah 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6
This paper presents an analysis of the received signal strength indicator (RSSI) from the radio frequency signals for human identifi cation in an indoor wireless sensor network (WSN). Instead of using closed-circuit television as the existing security platform, this indoor safety system was improved with a convenient, cheap, and low-power solution. The system was developed using 20 of ESP8266-12F Wi-Fi modules transmitters and another 2 of ESP8266-12F as the access points located in 3 m × 3 m area of interest. With a suitable coordinate of sensor nodes, a WSN telemetry could be established to minimize the blind spot area and limit the movement of the intruder with a minimum area of 0.2 m 2 . The RSSI measurement was repeatedly conducted for three diff erent conditions, in an empty room, with the presence of a single intruder and the presence of multiple intruders. Based on the RSSI values, we found that there are distinctive features of data that can be utilized as fl ags for classifying the three above conditions. Besides that, to justify the effi ciency of system performance, we also examined the sensitivity of RSSI values towards the variation of temperature. Our results show that the RSSI average values for both morning and night were practically the same. However, during the afternoon, the RSSI signal strength fl uctuated by − 1.0 dBm. These results motivate the development of an alarm system that only uses the RSSI statistics to detect human presence.
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