Articles
<![CDATA[Desain dan Pengembangan Fluxgate Magnetometer dan Beberapa Aplikasinya ]]>
<![CDATA[Suyatno, Suyatno]]>;
<![CDATA[Djamal, Mitra]]>;
<![CDATA[Yulkifli, Yulkifli]]>;
<![CDATA[Setiadi, Rahmondia N.]]>
<![CDATA[ Jurnal Fisika dan Aplikasinya Vol 4, No 1 (2008) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS ]]>
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DOI: 10.12962/j24604682.v4i1.947
<![CDATA[Telah dilakukan pembuatan dan pengembangan sensor magnetic fluxgate yang terdiri dari dua buah probe, berupa kumparan eksitasi, kumparan sekunder (pick-up) dan inti terbuat dari bahan vitrovac. Dengan menggunakan metode harmonisa kedua, penggunaan sensor ini adalah untuk mengukur besarnya medan magnetik, pengukuran arus pada penghantar dan pengukuran jarak. Pada pengukuran medan magnet didapatkan nilai pengukuran B hingga 20 nT dengan sensitifitas 533,94 mV/μT, dengan kesalahan absolut 200 mV dan kesalahan relatif 2,76%, sedang untuk pengukuran jarak, sensor ini mampu melakukan pengukuran jarak sampai pada jarak 13,8 mm dengan resolusi sampai pada 10 μm dan kesalahan absolut 0,16 mm serta kesalahan relatif sebesar 3,4%.]]>
<![CDATA[SENSOR MAGNETIK FLUXGATE, KARAKTERISTIK DAN APLIKASINYA ]]>
<![CDATA[Mitra Djamal]]>;
<![CDATA[Suyatno Suyatno]]>;
<![CDATA[Yulkifli Yulkifli]]>;
<![CDATA[Rahmondia N. Setiadi]]>
<![CDATA[ Jurnal Sains Materi Indonesia EDISI KHUSUS: OKTOBER 2007 ]]>
Publisher : <![CDATA[Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency ]]>
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DOI: 10.17146/jusami.2007.0.0.5145
<![CDATA[SENSOR MAGNETIK FLUXGATE, KARAKTERISTIK DAN APLIKASINYA. Telah dilakukan pembuatan dan pengembangan sensor magnetik fluxgate berdasarkan prinsip harmonisa ke dua. Sensor ini mempunyai inti yang terbuat dari bahan khusus vitrovac 6025, dan dua buah probe, yakni probe untuk kumparan primer (pengeksitasi atau excitation coil) dan probe untuk kumparan sekunder (penangkap atau pick-up coil). Sensor ini memiliki sensitivitas yang meningkat dengan meningkatnya jumlah lilitan kumparan sekunder dan/atau meningkatnya suhu operasi. Dalam makalah ini akan ditunjukkan beberapa aplikasi dari sensor magnetik fluxgate, misalnya untuk mengukur kuat medan magnet lemah, kuat arus dan jarak. Pada pengukuran kuat medan magnet lemah dilakukan pengukuran pada daerah -20 μT sampai dengan +20 μT dan diperoleh ketelitian hingga 20 nT dengan sensitivitas 533,94 mV/ μT dan kesalahan relatif 2,76%. Untuk pengukuran jarak, sensor ini mampu melakukan pengukuran perubahan jarak hingga 5 mm dengan resolusi 10 μm dan kesalahan relatif sebesar 3,4%. Sedangkan untuk pengukuran kuat arus, fluxgate magnetometer mampu melakukan pengukuran arus (0 mA hingga 1900 mA) dengan kesalahan relatif < 4,6%]]>
<![CDATA[PENGEMBANGAN SENSOR MAGNETIK MAGNETORESISTIF (MR) UNTUK APLIKASI KOMPAS ELEKTRONIK ]]>
<![CDATA[Lazuardi Umar]]>;
<![CDATA[Rahmondia Nanda Setiadi]]>;
<![CDATA[Siska Maulana]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 12, No 11 (2015) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.12.11.759-763
<![CDATA[Dewasa ini sangat dibutuhkan peralatan-peralatan elektronik yang dapat memudahkan manusia dalam melakukan aktivitas. Pembuatan kompas ini menggunakan sensor medan magnet yaitu sensor HMC5883L. Alat telah diuji dan dikalibrasi menggunakan kalibrator standar medan magnet yaitu Teslameter FH51. Dalam penentuan arah sensor HMC5883L dihubungkan dengan Arduino Uno yang dihubungkan ke PC dengan menjalankan aplikasi perangkat lunak berbasis Visual C++. Sensor HMC5883L mengandalkan efek magnetoresistif dengan sensitivitas linearitas untuk mengukur medan magnet bumi yang lemah. HMC5883L merupakan elemen sensor medan yang yang dilengkapi dengan set/reset dan kompensasi kumparan terintegrasi. Selain elemen sensor, unit pengkondisian sinyal dan unit penentuan arah juga diperlukan untuk membangun sebuah kompas elektronik. Fungsi utama dari unit pengkondisian sinyal adalah amplifikasi sensor sinyal dan kompensasi offset. Kedua teknik kompensasi dapat diimplementasikan hanya dengan mengendalikan set terpadu/ ulang dan kumparan kompensasi HMC5883L tersebut. Teknik kalibrasi juga berhubungan dengan gangguan, deklinasi dan kemiringan yang ditunjukkan. Akhirnya akan menghasilkan sistem kompas yang lengkap.]]>
<![CDATA[PENINGKATAN SENSITIVITAS SENSOR KOIL DATAR MEMPERGUNAKAN SOFT MAGNETIC VITROVAC ]]>
<![CDATA[Tengku Emrinaldi]]>;
<![CDATA[Defrianto]]>;
<![CDATA[Sultan Fiddunya Fiddunya]]>;
<![CDATA[Rahmondia N. Setiadi]]>;
<![CDATA[Lazuardi Umar]]>
<![CDATA[ JOURNAL ONLINE OF PHYSICS Vol. 5 No. 1 (2019): JOP (Journal Online of Physics) Vol 5 No 1 ]]>
Publisher : <![CDATA[Prodi Fisika FST UNJA ]]>
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DOI: 10.22437/jop.v5i1.7986
<![CDATA[This study reports the design of non-magnetic plate thickness sensors based on Eddy Current principld in the form of flat coils. The principle used in the Eddy Current sensor is a change of mutual coil inductance due to the presence of objects in the magnetic field. The coil is made up of single and double layer coil designed using Corel Draw Software based on printed circuit board (PCB) material with dimensions of 152.4 mm x 101.6 mm, which has a track distance of 0.125 m. Single and double layer coil inductance evaluations are carried out using the EVB LDC 1000 L/V Converter module which converts plate thickness into inductance values. The addition of a 30 mm Vitrovac thin film mounted in the direction of the winding in the 2 mm diameter coil core has been carried out to increase the sensitivity value of the sensor which gives an increase in sensitivity value of S = 0.321 uH / mm or 33.2%. The coil is able to measure plate thickness up to 10mm well.]]>
<![CDATA[PENGEMBANGAN DETEKSI ONLINE GAS KARBONDIOKSIDA MENGGUNAKAN CO2 METER VOLTCRAFT CM-100 ]]>
<![CDATA[Sri Handayani]]>;
<![CDATA[Lazuardi Umar]]>;
<![CDATA[Rahmondia Nanda Setiadi]]>
<![CDATA[ Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 2 (2015): Wisuda Oktober 2015 ]]>
Publisher : <![CDATA[Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam ]]>
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<![CDATA["> Air pollution is one of environmental contaminations occurred by various factors, outside and inside the room. Based on NIOSH (National Institute for Occupational Safety and Health), the safe level of Carbondioxide for humans is less than 1000 ppm. In this study one sample component is developed that can measure and monitor the levels of Carbondioxide, and a moisture level inside the room by online service. this uses a Carbondioxide meter and SHT11 sensor-based microcontroller ATmega8535. The development of Carbondioxide consists of two stages of process, namely, a design and construction of the air quality monitoring systems, and data acquisition. There are four scenarios for collecting data smoky weather, rain weather, measurements of carbon dioxide levels in the room with variations of ventilation and variations in the number of occupants in the room. The research sucsesfully designs the component. It can be seen from the amount of Carbondioxide stage and humidity levels. The amount of Carbondioxide concentration on the smoke state the maximum is 621 ppm while the minimum value is 426 ppm. For intersection of accupant and ventilation variable, the maximum and minimum Carbondioxide is 1535 ppm and 467 ppm respectively. The moisture measurement scenario with SHT11 sensor for smoky weather has maximum value at 83.9%, the moisture with a minimum is at 71.0%, on the rain weather maximum value obtained at 85.8% and 77.3% for minimum. While the occupant’s variation and variation of ventilation obtained maximum humidity value at 82.7% with a minimum value at 68.7%.]]>
<![CDATA[AUTOMATISASI KALIBRASI SENSOR SUHU PTC DAN NTC MEMPERGUNAKAN SUMBER TEGANGAN TERPROGRAM DAC7611 ]]>
<![CDATA[Herman Syahputra]]>;
<![CDATA[Lazuardi Umar]]>;
<![CDATA[Rahmondia Nanda Setiadi]]>
<![CDATA[ Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014 ]]>
Publisher : <![CDATA[Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam ]]>
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<![CDATA[A system calibration of PTC and NTC temperature sensor using a preprogrammable voltage source based on DAC7611 was designed. Temperature sensors of PTC typethermistor used was a type of RS and NTC type was B57962 S282 using a standard voltage divider with resistance to both sensors. Sensor voltage was increased with a step interval of 1V and time equilibrium sensors of 120 s. The characteristic of the sensor were modeled in the form of the curve I(U) based on the self-heating effect (Self-Heating). Results of measurements and modeling using automatic and manual calibration showed two curves coincided, but there was a difference of 5,8mA maximum current for the PTC sensor and 0,552mA for NTC sensor. These resultsindicated that the manufacturing of automatic calibration system worked and only had a small difference to the manual calibration. This was due to the difference in temperature of the ambient.]]>
<![CDATA[Pengukuran Medan Magnet Lemah Menggunakan Sensor Magnetik Fluxgate dengan Satu Koil Pick-Up ]]>
<![CDATA[Mitra Djamal]]>;
<![CDATA[Rahmondia Nanda Setiadi]]>
<![CDATA[ Journal of Mathematical and Fundamental Sciences Vol. 38 No. 2 (2006) ]]>
Publisher : <![CDATA[Institute for Research and Community Services (LPPM) ITB ]]>
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DOI: 10.5614/itbj.sci.2006.38.2.2
<![CDATA[A magnetic sensor has been developed for measuring a very low magnetic field. The sensor consists of two primary coils (excitation coil) and one secondary coil (pick-up coil). Primary coil that wound at ferromagnetic core is made symmetry each other. Whereas secondary coil is wound to both of cores. Primary coil drives the core until it saturated. The generated magnetic field from excitation have the contrary direction, so if there is no external magnetic field, the magnetic field inside the secondary coil is symmetry, but if there is an external magnetic field, there will be magnetic field changes inside secondary coil. These changes will induce secondary coil, as a consequence, there will be an induction voltage that acts as signal at the ends of secondary coil. The signal is then differentiated, amplified, inserted to controlled rectifier, integrated, and amplified for the last time. From measurement results, it can be obtained that magnetic sensor can measure magnetic field in the range of measurement from -40 μT to 40 μT, with sensitivity about 346.47 mV/μT and relative error less than 4%.]]>
<![CDATA[FRUIT SWEETNESS CHARACTERIZATION USING IMPEDANCE SPECTROSCOPY METHOD ]]>
<![CDATA[Rahmondia N Setiadi]]>;
<![CDATA[Lazuardi Umar]]>
<![CDATA[ Spektra: Jurnal Fisika dan Aplikasinya Vol 4 No 2 (2019): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 4 Issue 2, August 2019 ]]>
Publisher : <![CDATA[Program Studi Fisika Universitas Negeri Jakarta ]]>
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DOI: 10.21009/SPEKTRA.042.04
<![CDATA[The processing of agricultural products requires technology implementation to increase its production. One way of this technology implementation to increase the production is fruit sweetness measurement, which can be used as a sorting tool of fruit products. The sorting process using this tool can be done with easier way compare than the manual and destructive test. The fruit sweetness is composed of a mixture of sweet molecules fructose, glucose, and sucrose. The measurements of these molecules are usually done with four-point probe and use dc current. In this study, a fruit sweetness characterization using impedance spectroscopy method has been developed and realized, which uses an ac current. By using this method, fruit sweetness level can be characterized based on the impedance measurement on the flesh of a test fruit based on its dielectric properties. The obtained characterization results show that the fruit sweetness level can be measured by the impedance measurement. The obtained impedance is proportional to the concentration of the sweet molecule glucose. This method can characterize the fruit sweetness well and agrees with the calibration result. Therefore, this method can be used to increase agricultural products.]]>
<![CDATA[BIOSENSOR SYSTEM DESIGN FOR DISSOLVED OXYGEN MEASUREMENT USING CURRENT MIRROR CIRCUIT ]]>
<![CDATA[Lazuardi Umar]]>;
<![CDATA[Rahmondia N Setiadi]]>;
<![CDATA[Arfianti]]>;
<![CDATA[Tetty M Linda]]>
<![CDATA[ Spektra: Jurnal Fisika dan Aplikasinya Vol 4 No 2 (2019): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 4 Issue 2, August 2019 ]]>
Publisher : <![CDATA[Program Studi Fisika Universitas Negeri Jakarta ]]>
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DOI: 10.21009/SPEKTRA.042.05
<![CDATA[A biosensor system using a current mirror circuit has been designed and characterized. Biosensor system usually implements an amperometric circuit such as a trans-impedance topology to measure current flowing in the solution due to the contained dissolved oxygen. The trans-impedance circuit implemented for the biosensor has some drawbacks and disadvantages. The implementation of this circuit exhibits rather high noise, besides the impracticality of the power supply used due to bipolar voltage need to allow negative voltage output. In this paper, a classical current mirror circuit is used to convert the flowing current in the solution. The use of the classical current mirror circuit is aimed to obtain lower noise level, besides the easiness in providing the power supply for the system, since the circuit consists only of small number of active components and does not need a bipolar power supply. The measurement is performed utilizing an algae species as a bio-receptor for the measured dissolved oxygen. By utilizing this circuit, the biosensor measurement system can be optimized with better precision and noise performance. Consequently, the dissolved oxygen measurements can be improved and achieve good results. Besides, the system can detect the changes in dissolved oxygen due to the photosynthetic process of the algae.]]>
<![CDATA[MULTI-CHANNEL FRY COUNTER DESIGN USING OPTOCOUPLER SENSOR ]]>
<![CDATA[Lazuardi Umar]]>;
<![CDATA[Yanuar Hamzah]]>;
<![CDATA[Rahmondia N Setiadi]]>
<![CDATA[ Spektra: Jurnal Fisika dan Aplikasinya Vol 4 No 2 (2019): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 4 Issue 2, August 2019 ]]>
Publisher : <![CDATA[Program Studi Fisika Universitas Negeri Jakarta ]]>
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DOI: 10.21009/SPEKTRA.042.06
<![CDATA[This paper describes a design of a fry counter intended to be used by consumption fish farmer. Along this time, almost all the fry counting processes are counted by manual, which is done by human. It is requiring much energy and needs high concentration; thus, can cause a high mental and emotional exhaustion for the fry counting worker. Besides that, the human capability and capacity for counting the are limited to a low number. A fry counter design in this study utilizes a multi-channel optocoupler sensor to increase the counting capacity. The multi-channel fry counter counting system is developed as a solution to a limited capacity of available fry counter. This design uses an input signal extender system for the sensor. The design is based on the interrupt combiner to accommodate multi-channel sensor used. Besides, the transmitter beam's angle is adjusted to deal with the deflection due to water surface. From the experiment, multi-channel sensor can be implemented and high accuracy level could be obtained on the counting and channel number detection, therefore, this design can be implemented and could help farmers to increase the production capacity of consuming fish.]]>
