SISTEM PEMANAS INDUKSI DENGAN MENGGUNAKAN SOLENOID COIL DAN MIKROKONTROLER

Pemanas induksi memiliki keterkaitan erat dengan kumparan induksi, di ameter kumparan, benda kerja, dan beban yang dipanaskan. Ketiga faktor ini memiliki pengaruh terhadap karakteristik pemanas yang dibuat. Tujuan dari penelitian adalah mengetahui pengaruh kinerja pemanas terhadap perubahan diameter dan jumlah lilitan kumparan induksinya. Adapun metode yang digunakan adalah metode eksperimental, dengan membuat sistem pemanas induksi dan melakukan pengujian terhadap pemanas yang telah dibuat. Hasil pengujian menunjukkan bahwa dalam pengujian suhu 1000C tanpa beban terhadap waktu pemanasan adalah 1,32 menit pada diameter benda kerja 7 cm dengan 7 lilitan. Ini adalah waktu tersingkat dibanding dengan diamater 7 cm dengan 12 lilitan yakni 2,22 menit. Selanjutnya, pada pengujian dengan beban terhadap waktu, dengan volume air 231mL diperoleh waktu pemanasan 2,79 4 menit. Selain itu, energi terkecil yang digunakan dalam waktu yang singkat ini adalah 83,89 kJ.

A Simulation Magnetic Induction Tomography (MIT) for Agarwood using COMSOL Multiphysics

Magnetic induction tomography is an imaging technique used to image electromagnetic properties of an object by using the eddy current effect. (MIT) is a non-destructive method that greatly is used in the agriculture industry. This method provided an opportunity to improve the quality of agricultural products. MIT simulation was used for agarwood existence detection. This paper presented for the simulation system contains 7 channel coils receiver and a channel transmitter which is a sensing detector. This experiment aims to demonstrate the reaction of induced current density and magnetic field at 10 MHz frequency. Then, it also determines the optimal solenoid coil to be used for a better outcome for the magnetic induction system. The simulation result shows that coil diameter, coil length, and coil layer have a crucial role in the great performance of the induced current and magnetic field. The more coil turns, the greater the strength of the permanent magnetic field around the solenoid coil. The result of the simulation is important and needs to be considered to verify the effectiveness of the system for developing the magnetic induction circuit design.

An Axial Foilless Diode Guided by Composite Magnetic Field for the Production of Relativistic Electron Beams

Foilless diode are widely used in high-power microwave devices, but the traditional foilless diodes have large volume, heavy weight, and high power consumption, which are not conducive to the application of high-power microwave system on mobile platform. In order to reduce the size of the foilless diode, improve the transmission efficiency of electron beams, and reduce the weight and power consumption of the guiding magnetic field system, an axial foilless diode with a composite guiding magnetic field system is developed in this paper. By adjusting the structure size and magnetic field parameters of solenoid coil, permanent magnet, and soft magnet, the configuration of the composite magnetic field is optimized. The diameter of the anode tube is about 40% smaller than that of the original structure, and the weight and power consumption of the guiding magnetic system are about 40% lower than that of the original system when the same axial magnetic field intensity in the uniform region is generated. When the magnetic field strength of the permanent magnet is set as 1.4 T and that of the solenoid coil is in the range of 0.5 T∼1 T, the electron beam transmission efficiency is 100%, and the diode impedance is adjustable in the range of 100 Ω∼240 Ω. The experimental results verify the correctness of the simulation analysis. The experimental results show that when the magnetic field strength of the solenoid coil is 0.98 T (0.5 T) and that of the permanent magnet is 1.4 T, the transmission efficiency of the high-current annular electron beam with a peak voltage of 636 kV (590 kV) and a peak current of 3.3 kA (2.6 kA) is 100%, and the diode impedance is about 194 Ω (220 Ω).