Rini, Ari Sulistyo
Universitas Riau

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PEMBUATAN DETEKTOR FREKUENSI TUNGGAL BERBASIS PRINSIP EDDY CURRENT UNTUK PENGUKURAN KETEBALAN LOGAM NON MAGNETIK CU DAN AL Sidabukke, Santi T; Rini, Ari Sulistyo; Emrinaldi, Tengku; Umar, Lazuardi
Komunikasi Fisika Indonesia Vol 14, No 1 (2017)
Publisher : Universitas Riau

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Abstract

Metode-metode yang telah dilakukan dalam pengukuran ketebalan logam adalah metodemanual (jangka sorong) dan metode ultrasonic thickness. Kelemahan dari kedua metode iniyaitu data yang dihasilkan kurang akurat karena sulitnya proses pembacaan dan harga yangrelative mahal. Pengembangan teknologi di bidang sensor memungkinkan pembuatandetektor ketebalan logam yang dapat mengatasi kelemahan dari kedua metode tersebut yaitumenggunakan eddy current. Sensor eddy current dapat mengukur ketebalan lapisan logamnon magnetik melalui hubungan tegangan dengan variasi ketebalan dimana ketebalan yangdigunakan untuk Cu yaitu 0,4 mm, 1 mm, 1,5 mm, 2 mm, 4 mm, 4,2 mm, 5 mm, 5,1 mmsedangkan Al yang digunakan yaitu 0,25 mm, 0,4 mm, 0,5 mm, 0,6 mm, 1 mm, 1,2 mm, 1,5mm, 2 mm, 2,2 mm, 3 mm, 4 mm, 5 mm dengan frekuensi yang diperoleh 700 KHz, 1 MHzdan 1,33 MHz. Kurva tegangan vs ketebalan untuk alumunium dan tembaga memilikihubungan eksponensial. Jarak antara sensor dengan material non magnetik dijaga konstansebesar 2 mm.
VISUALISASI STRUKTUR KRISTAL KERAMIK PEROVSKITE MENGGUNAKAN VESTA Restiana, Sundami; Rini, Ari Sulistyo
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

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Abstract

Visualization of crystal structures and simulation of X-ray diffraction patterns of perovskite ceramic was successfully performed by VESTA software programs. The purpose of this research is to obtain the relation of lattice parameter, and composition to the diffraction pattern. The software program produces crystal structure information and a representative X-ray diffraction pattern for the ceramic materials. The program needs several input parameters such as the coordinates of each constituent atom, lattice parameters, and space symmetry. The obtained output of the software program are in the form of diffraction pattern graph and crystal structure data which gives the description of the profile and type (phase) of ceramic material. The results showed that the peak position and intensity of the diffraction pattern are influenced by the arrangement of  the atoms within the unit cell. The addition of impurity atoms such as Sr on the Ba side in BaTiO3 causes the BaTiO3 structure changes from Orthorombic (a≠b≠c) to Tetragonal (a=b≠c) structure. Based on the simulation, it can be predicted that the critical concentration of the change of structure occur at Sr concentration about 0.4.