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EDDY CURRENT SENSOR BERBASIS FLAT COIL FR4 UNTUK MENENTUKAN KETEBALAN PELAT LOGAM NON MAGNETIK AL Emrinaldi, Tengku; Salomo, Salomo; Hamzah, Yanuar; Iwantono, Iwantono; Umar, Lazuardi
Spektra: Jurnal Fisika dan Aplikasinya Vol 2 No 3 (2017): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 2 Nomor 3, Desember 2017
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (391.066 KB) | DOI: 10.21009/SPEKTRA.023.07

Abstract

Abstrak Sensor arus eddy (eddy current) digunakan untuk pengukuran ketebalan logam khususnya logam non magnetik seperti alumunium.  Penelitian ini telah mengembangkan sensor eddy current berbahan PCB (printed circuit board) jenis FR4 yang memiliki ketebalan lapisan tembaga 35micron. Prototipe yang dihasilkan mempergunakan koil sensor dengan jumlah gulungan (n) 30 lilitan, diameter (Æ) 30mm, lebar dan jarak antar koil, (dkoil) 0,254mm dan tahanan (Rkoil) sebesar 4,26Ω. Respon sensor ketebalan pelat logam terhadap bahan uji dievaluasi dengan memberikan eksitasi frekuensi tunggal 700Khz, 1MHz dan 1.33MHz. Rangkaian ketebalan pelat telah mempergunakan rangkaian pengunci fasa (phase locked loop) dan mampu mengukur variasi ketebalan  mulai 0,2 mm sampai 2 mm, sementara jarak antara sensor dengan logam uji dijaga konstan 2 mm. Hasil pengukuran memberikan respon kurva U(t) dalam hubungan Kata-kata kunci:sensor eddy current, PCB FR4, material non magnetik, ketebalan logam, rangkaian phase locked loop Abstract Eddy current sensor is used to measure the thickness of metals, especially non-magnetic metals such as aluminum. This research has developed eddy current sensor made from PCB (printed circuit board) type FR4 which has 35micron copper layer thickness. The developed prototype uses a designed coil sensor with the number of winding (n) 30 turn, diameter () 30mm, width and distance between coils, (dkoil) 0.254 mm and coil resistance (Rkoil) of 4.26 Ω. The sensor response to the test material was evaluated by giving a single frequency excitation of 700 Khz, 1 MHz and 1.33 MHz. The plate thickness electronics has used a phase locked loop circuit and is capable to measure the thickness variations from 0.2 mm up to 2 mm, while the distance between the sensor coil and the test object was kept constant at 2 mm. The measurement results give the U (t) curve response in the exponential relationship. Keywords: eddy current sensor, PCB FR4, nonmagnetic material, thickness, phase locked loop circuit
ANALISA SIFAT NUTRISI TANAH PERKEBUNAN YANG DIBERI PUPUK UREA (CO(NH2)2) MENGGUNAKAN SENSOR NUTRISI TANAH Hamzah, Yanuar; Umar, Lazuardi
Komunikasi Fisika Indonesia Vol 12, No 11 (2015)
Publisher : Komunikasi Fisika Indonesia

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Abstract

Has conducted a study to analyze the nutrient properties of oil palm plantation land by ureaCO(NH2)2 uses sensor Wenner modification of soil nutrients. Soil nutrient concentrations simulatedby varying the mass amounts of fertilizer, where the mass of fertilizer used is 5, 10, and 15 grams.Then measuring to see a shift in the frequency and amplitude. The results showed that the frequencyshift
KARAKTERISASI DAN SIMULASI DIODA PN MEMPERGUNAKAN ALAT UJI OTOMATIS BERBASIS MIKROKONTROLER ATMEGA8A Oktavia, Dian Putri; Hamzah, Yanuar; Umar, Lazuardi
Komunikasi Fisika Indonesia Vol 13, No 12 (2016)
Publisher : Komunikasi Fisika Indonesia

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Abstract

An automated test platform for I-U curve diode characterisation based on microcontroller of Atmega8A is presented. Four types of diodes; 1N4007, 1N5401, 1N5392, and 1N4148 were characterized at temperature 303K using step voltage (dU) of 1mV, 5mV, 10mV, 20mV, 50mV, 100mV, and 500mv respectively. The temperature influences on diode was observed by putting diodes in adiabatic temperature chamber at three different temperatures of 313K, 323K, and 333K, the I-U curve of diodes are then measured. The results show an exponentially diodes I-U curve at quadrant I (forward bias region). For diode parameters, the I-U curve were then modeled and simulated after diodes equation and resulted an maximum absolute error 10.57% of full scale measurement
KARAKTERISASI DAN SIMULASI DIODA PN MEMPERGUNAKAN ALAT UJI OTOMATIS BERBASIS MIKROKONTROLER ATMEGA8A Oktavia, Dian Putri; Hamzah, Yanuar; Umar, Lazuardi
Komunikasi Fisika Indonesia Vol 13, No 12 (2016)
Publisher : Universitas Riau

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Abstract

An automated test platform for I-U curve diode characterisation based on microcontroller of Atmega8A is presented. Four types of diodes; 1N4007, 1N5401, 1N5392, and 1N4148 were characterized at temperature 303K using step voltage (dU) of 1mV, 5mV, 10mV, 20mV, 50mV, 100mV, and 500mv respectively. The temperature influences on diode was observed by putting diodes in adiabatic temperature chamber at three different temperatures of 313K, 323K, and 333K, the I-U curve of diodes are then measured. The results show an exponentially diodes I-U curve at quadrant I (forward bias region). For diode parameters, the I-U curve were then modeled and simulated after diodes equation and resulted an maximum absolute error 10.57% of full scale measurement.
PEMBUATAN KOMPOSIT KARBON DARI CAMPURAN ARANG BAMBU DENGAN PETROLEUM COKE MENGGUNAKAN METODA KARBONISASI Hamzah, Yanuar; Umar, Lazuardi; Malik, Usman
Jurnal Material dan Energi Indonesia Vol 7, No 02 (2017): Jurnal Material dan Energi Indonesia
Publisher : Departemen Fisika Fakultas MIPA Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (640.225 KB) | DOI: 10.24198/jmei.v7i02.10936

Abstract

Telah dilakukan penelitian pembuatan komposit karbon dari campuran arang bambu jenis (Gigantochloa apus) dengan petroleum coke dari limbah industri pengolahan minyak bumi menggunakan metoda karbonisasi. Pada penelitian ini dilakukan perlakuan dengan persentase rasio massa arang bambu:petroleum coke adalah 70:30, 50:50 dan 30:70 menggunakan perekat resin berbentuk lingkaran dengan diameter 3 cm lalu ditekan dengan alat hydrolic testing machine agar komposit karbon dihasilkan menjadi padat. Sifat struktur, morfologi dan komposisi komposit dianalisa menggunakan difraksi sinar-x, mikroskop pindai elektron dan energy dispersive x-ray. Analisa pola difraksi sinar x telah dihitung jarak antar bidang (d) dan parameter kristal karbon meliputi stackheight, Lcdan stackwidth, La. Bentuk morfolgi komposit karbon terlihat tidak teratur dan berserat serta adanya mikropori dengan ukuran antara 10-100 mm. Persentase unsur karbon pada komposit karbon meningkat dengan meningkatnya persentase rasio massa petroleum coke setelah dianalisa menggunakan energy dispersive x-ray specrtroscopy dan terdapat sejumlah kecil persentase silikon dan kalium.
Characterization of Rare Earth Elements in Tailing of Ex-Tin Mining Sands from Singkep Island, Indonesia Hamzah, Yanuar; Mardhiansyah, Muhammad; Firdaus, Liong Nyuk
Aceh International Journal of Science and Technology Vol 7, No 2 (2018): August 2018
Publisher : Graduate School of Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (541.653 KB) | DOI: 10.13170/aijst.7.2.8622

Abstract

The objective of this research is to determine the rare earth elements (REEs) from themonazite minerals content of several tin tailing sands (TTS)of ex-tin mining area in Kuala Raya Singkep Island, Indonesia. We used the energy dispersive analysis of  X-ray (EDAX)-scanning electron microscopy (SEM) and x-ray diffraction (XRD) to characterize the contents of the samples. The coupled analytical of XRD with SEM/EDX approach enabled to be used for mineralogical identification on the heavy mineral as a rapid determination approach. The analysis of the samples indicates only the presence of REEs including lanthanum (La), cerium (Ce), and thorium (Th) are consistent with the identification of monazite and minerals in the tailing sand. The results show that the average REEs consist of La at 0.2 .%, Ce at 7.8 %, and Th at 2.0% respectively. It is concluded that monazite minerals in TTS has an economic potential to be developed. These monazite minerals can be used as material for semiconductor devices.   
Growth Mechanism and Characterization of PbTe0.5Se0.5 Thin Films Used by Closed-Space Vapor Transport in a Vertical Reactor Hamzah, Yanuar; Copriady, Jimmy; Ariswan, Ariswan
Reaktor Volume 19 No. 1 March 2019
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (522.901 KB) | DOI: 10.14710/reaktor.19.1.11-17

Abstract

A simple method for growing thin film of semiconductor material PbTe0.5Se0.50 has been designed using the vapor transport (CSVT) method in a vertical reactor. The objectivity of this method is to study thin film growth formation due to chemical reactions during the deposition process in the reactor. In this study will describe some formations the vapor transport mechanism of PbTe0.5Se0.50 semiconductor material using iodine gas (I2) to accelerate the etching reaction on the substrate surface. Next, we will describe how the mechanism of the reaction in the reactor zone for growing thin films on the substrate. The thin films were characterized by structural, morphology properties and its composition. The film structure is a cubic structure with the maximum diffraction intensity at peak (222). The surface morphology of the thin film has a microcubes shape with a grain size~10 to 20 mm. Keywords: etching reaction; micro-cube; PbTe0.5Se0.50; close-spaced vapor transport