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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences BULETIN OSEANOGRAFI MARINA BERKALA FISIKA SAINS DAN MATEMATIKA YOUNGSTER PHYSICS JOURNAL
Indras Marhaendrajaya
Physics Department, Faculty Of Sciences And Mathematics, Diponegoro University
Earth & Planetary Sciences Mathematics Physics

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Sudut Putar Jenis Elektrooptis pada Bensin dan Spiritus Riyani, Riyani; Marhaendrajaya, Indras; Firduasi, K. Sofjan
BERKALA FISIKA Vol 11, No 1 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

In this paper, we measured the specific electro optic rotary power h of petroleum and spiritus solution in static external electric field Eex using Kerr Effect. The magnitude field to induce the samples is produced by two parallel plates (3 ´ 4 cm2) applied on varied DC high voltage 0-10 kV. Variation of NaCl solution is held on 5%, 10%, until 35%. The light source used to observe change of polarization angle is diode pointer laser 654 nm in wavelength. From the result of experiment we obtained that theh’s value of petrol is (0.1040.008) o/V and for spiritus is (0.0660.006) o/V, indicates that Petrol optics more active than spiritus one.   Key words: non-linear optics, external electrics field, specific electro optic rotary power
Pengukuran Panjang Koherensi Menggunakan Interferometer Michelson Setyaningsih, Agustina; Marhaendrajaya, Indras; Firdausi, K. Sofjan
BERKALA FISIKA Vol 10, No 4 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A simple measurement of coherence length of He-Ne laser, red diode laser, and green diode laser using Michelson interferometer has been conducted. The steps in this research were setting up the Interferometer by places movable mirror on mirror rail. To determine the coherence length of the laser’s light, movable mirror has been shifted until the interference fringes disappear on the screen. Results of measurement for the coherence length of He-Ne laser I is  cm, He-Ne laser II is  cm, red diode laser I is cm, and green diode laser II is  cm. Keywords: Coherence, coherence length.
PENGARUH VARIASI KOMPOSISI BRIKET ORGANIK TERHADAP TEMPERATUR DAN WAKTU PEMBAKARAN Tarsito, Teguh; Sutanto, Heri; Marhaendrajaya, Indras
BERKALA FISIKA Vol 16, No 1 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

It has been carried out to study of influence of variation composition in organic briquetteabout temperature and duration time combustion briquette that was optimum. Briquette had made that was  briquette with composition rice hull, briquette with composition rice hull and sawdust wood rubber that mixed with glue from amylum gel. Experimental method was used in this research. Briquette sample  was burned and measured the temperature of combustion so we gained the values between temperature with combustion briquette duration time of sample briquette,briquette mass before combustion and mass residue of combustion. From the result of this researchthe conclusions can be made were the sample briquette   have  highest temperature of combustionand longest  duration time of  combustion was sample briquette with composition rice hull andwood rubber sawdust = 4 grams : 6 grams with oven  temperatur  100oC because have longestduration time combustion  over temperature  100oC with fluctuation 100°C-150°C was 12 minutes.Keywords :  briquette,  combustion calor, rice hull
SINTESIS DAN KARAKTERISASI MATERIAL MAGNETIK BARIUM HEXAFERRITE TERSUBSTITUSI MENGGUNAKAN TEORI SOLGEL UNTUK APLIKASI SERAPAN GELOMBANG MIKRO PADA FREKUENSI X-BAND Sulistyo, Sulistyo; Marhaendrajaya, Indras; Priyono, Priyono
BERKALA FISIKA Vol 15, No 2 (2012): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The Barium hexaferrite well known by permanen magnet which have prime properties for microwave application. The properties of Barium hexaferrite modified by substitution of MnCo and Ti have been investigated. Material was produced by sol-gel processing. Analysis of composition, crystal structure, refinement, microstructure and grain size, hysterisies and microwave characteristic respectively done by means of EDX, XRD, GSAS, SEM, magnetometers and wave guide at frequency1-17GHz. The formed crystal structure were hexagonal with the grain size is 500 nm, saturation magnetisation, field of coercivities , and remaneninduction respectively is 0.32 T,  3.8 kA/m and 0.04 T. The substitution of Fe3+ ion, resulted on decreasing the value of Ms, Hc , Rr and range of microwave absorbtion respectively. The maximum absorbtion of microwave occured on frequency 13.6 GHz.Keywords : barium hexaferrite, permanen magnet, sol-gel method, microwave
Studi Efek Kerr Untuk Pengujian Tingkat Kemurnian Aquades, Air PAM dan Air Sumur Sukarsono, Kristantyo; Marhaendrajaya, Indras; Firduasi, K. Sofjan
BERKALA FISIKA Vol 11, No 1 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

In this research was discussed about the ratio of purity level of aquades, running water, and well water by using the Kerr effect. Several substances being used are sugar solutions with the concentration of 10%, 20%, 30%, 40% and 50% for linearity testing, salt solutions with the concentration of 10%, 30% and 50% for the testing of ionic response which be infested by some dipoles of H2O molecules in the salt solution toward the external electrical field, and also aquades, running water and well water as the water samples having the different purity. The external electrical field being given in the substances from zero to 9×105 V/m and awakened by conducting the direct current of electric on the parallel plates. A light beam being used is a diode laser with λ = 645 nm. The result of research was showing that the presence of external electrical field causing the difference of polarization angle indicating the purity level of water kinds since influenced by ions in the water. Based on the ions containing in it have been known that the value of aquades purity is 4 ppm, the value of running water purity is 108 ppm and the value of well water purity is 190 ppm. So, aquades is purer than running water and running water is purer than well water. The average value of polarization angle of aquades, running water, and well water is approximately 0,50º, 0.25º and -0,25º respectively. Key words: Kerr Effect, electrical field, polarization angle
PENGARUH POLARITAS MEDAN LISTRIK EKSTERNAL DAN SUDUT POLARISASI LASER DIODA UNTUK PENGAMATAN EFEK KERR Wibowo, Hari; Sugiyanto, Eko; Firdausi, K. Sofjan; Marhaendrajaya, Indras
BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

An identification of non linear optics of some material has been carried out. The samples used here are mineral water, salt solution, and sugar solution for various concentrations. A static applied external field E is adjusted to left and right direction. And also, the direction of electric field of laser is varied against E. The magnitude of E used in the experiment is produced by a DC high voltage (0-10 kV) applied on two identical parallel plates. A source of light to the samples is a diode laser of 645 nm and 5 mW. The change of polarization angle of laser b after through the samples is the optical property to be identified. Both of mineral water and salt solution, the effect of polarity of E shows identical results of b vs. E. In case of sugar solution, we obtain a positive gradient for right polarity and negative gradient for left polarity of E. Key words: non linear optics, polarization, polarization angle, Kerr Effect
Sifat Optis Tak-Linear Pada Material KDP Setyawan, Rahmadi; Setiawati, Evi; Marhaendrajaya, Indras; Firdausi, K. Sofjan
BERKALA FISIKA Vol 11, No 3 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Non-linier optical properties of transparent material Kalium Di- hydrogen Phosphate (KDP) have been identified under the influence of external magnetic fields at wavelength 632.8 nm and 532 nm by using Faraday Effect method. The external  magnetic fields used in this experiment is produced from coils with total turns of 810, wire diameter of 0,8 mm, and soft magnet core, and is flowed by maximum AC current 5 A. The magnitude of magnetic fields can be produced is 194.23 mT. The optical property measured here is rotation of polarization angle ß of the laser beam after passed the transparent material. From the experiment, it is obtained Verdet’s constant value for transparent material KDP is (12.60 ± 0.59) min/G-cm at  = 632.8 nm and (14.93 ± 0.73) min/G-cm at  = 532 nm.   Key words: non-linier optic, KDP, magnetic fields, polarization, Verdet’s constant
Penentuan Tebal Bahan Transparan (ZnO) Menggunakan Interferometer Michelson Edy Nugroho, Sulung; Firdausi, K. Sofjan; Marhaendrajaya, Indras
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Thickness’ determination of ZnO material on a substrate (microscope slide) by using Michelson Interferometer has been carried out. The material used in the research was ZnO transparent material deposited on a 1 mm-thickness of a microscope slide.  Refractive index of the microscope slide and the thickness of ZnO were measured by counting the fringes transitions as the materials rotated large as , on the other words, fringes transitions   as function of sinus incident angles  of laser ray, .  Incident angles of laser ray, which are used in the measurement of  ZnO transparent material thickness on microscope slide, are 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, and 10°.  Laser ray used in this research was He-Ne laser, which has 633 nm and its output power was < 1 mW. The results of this research show that there were  fringes transitions as research-materials rotated large as .  The measured fringes transitions still have remarkable agreement with the theoretical fringes transitions.  As the incident angles increases, the fringes transitions  will increase as well as.  The thickness of the ZnO thin film, which is resulted from the research, is equal to (6.0 ± 1.8) × 10-5 m.
Efek Magnetooptis Pada Lapisan AgBr Terekspos Sulistyo, Respita; Firdausi, K. Sofjan; Marhaendrajaya, Indras
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The non linear optic characteristic from several transparent medium (film plate and glass) under influence of external magnetic field and variation of wavelengths, have been identified. In this experiment, the developed AgBr film is deposited on a hologram. The magnetic field has been produced by coils which connected to slide regulator (0-240V). The maximum value of magnetic field is about 182,0 mT. Light sources used are He-Ne Laser with a wavelength of 633 nm and 1 mW in power, and green laser pointer with a wavelength of 532 nm and power less than 5 mW. The optical characteristic measured in this experiment is the rotation of electric field, of the transmitted laser beam due to applied external magnetic field to the medium. The experiment result shows that  is dependent linearly on magnetic fields. The Verdet constant is proportional with wavelength of the light. Measured values for Verdet constant (V) at 632,8 nm is (0,487300,00070) min/G-cm and at 532 nm is (0,261700,00056) min/G-cm for glasses material and the values for Verdet constant at 632,8 nm is (0,328500,00060) min/G-cm  and at 532 nm is (0,156900,00039) min/G-cm for film plate.   Key words:Magnetooptical effect, non linear optic, Verdet constant
Review Studi Difraksi Fresnel Menggunakan Celah Bentuk Lingkaran Rosyidah, Arinar; Marhaendrajaya, Indras; Firduasi, K. Sofjan
BERKALA FISIKA Vol 11, No 2 (2008): Berkala Fisika
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Abstract

The Fresnel Diffraction has been reviewed to measure the wavelenght of monochromatic light sources. The change of circle fringe’s number is obtained by the change of the distance between source and slits, and the change of fringe’s radius. We used here the diode green pointer laser and red pointer laser as light sources with 1 mW in power. From the measurement, we obtained that the wavelenght of green laser and red pointer laser are still in the range of literature values. Key words: Fresnel diffraction, Fresnel zone.
Co-Authors Agung Cahyono Agus Subagio Annisa Fadillah Anugrah Rahma Ari Wiganti Arinar Rosyidah Eko Hidayanto Eko Sugiyanto Evi Setiawati Hadi Endrawati Hari Wibowo Heri Sutanto Hermin Pancasakti Kusumaningrum Imam Misbach Istianah Istianah K. Sofjan Firdausi K. Sofjan Firduasi Kristantyo Sukarsono Muhammad Iskandar Zulkarnain Muhammad Zainuri Pandji Triadyaksa Priyono Priyono Rahmadi Setyawan Respita Sulistyo Riyani Riyani Robertus Triaji Mahendrajaya Setyaningsih , Agustina Sulistyo Sulistyo Sulung Edy Nugroho Teguh Tarsito Vincensius Gunawan S.K. Wahyu Dewi Utari Haryanti Widianingsih Widianingsih Yuvita Muliastuti Zaenal Arifin