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All Journal Indonesian Journal of Geography Jurnal ILMU DASAR JOURNAL AGRIBUSINESS Journal of Mathematical and Fundamental Sciences Jurnal Spektra Spektra: Jurnal Fisika dan Aplikasinya Neutrino Jurnal Otomasi, Kontrol, dan Instrumentasi Risalah Fisika Sainstek : Jurnal Sains dan Teknologi Pillar of Physics: Jurnal Berkala Ilmiah Fisika
Mitra Djamal
Institut Teknologi Bandung
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Mathematics Physics Other

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Desain Prototype Sensor Pergeseran Tanah dengan Menggunakan Sensor LVDT (Linear Variable Differential Transformer) Jefriyanto, Wilson; Saka, Bergita Gela M.; Djamal, Mitra
Neutrino Vol 2 No 1 (2019)
Publisher : LPPM UKI Toraja

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (400.579 KB)

Abstract

Telah dikembangkan sensor Linear Variabel Differential Transformer (LVDT) yang merupakan sensor posisi yang dapat dijadikan sebagai sensor pergeseran tanah.. Perkembangan sensor LVDT banyak mengalami perkembangan dan sudah mulai diproduksi dalam bentuk prototipe, namun harga jualnya masih tergolong mahal sehingga tidak mudah untuk mendapatkannya. Pada penelitian ini sensor LVDT dibuat dengan menggunakan bahan yang terjangkau sehingga harganya lebih murah.. Sensor LVDT ini telah dikalibraqsi dengan membandingkan pengukuran jarak menggunakan mistar. Hasil dari penelitian ini yaitu telah berhasil membuat rancangan desain prototype sensor LVDT yang memiliki spesifikasi nilai skala terkecil (NST) 0.1 mm dengan jangkauan pengukuran sampai 140 mm.
Pembuatan prototipe sensor potensial listrik sebagai perangkat penunjang pada Receiver Controlled Source Electromagnetic Indrasari, Widyaningrum; U, Umiatin; Djamal, Mitra; Trihatmoko, Danang
Jurnal Spektra Vol 11, No 1 (2011): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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Abstract

Telah dilakukan pembuatan dan karakterisasi prototype sensor potensial listrik. Berdasarkan kalibrasi sensor potensial listrik X  terhadap kalibrator kesalahan absolut maksimum dan kesalahan relatif maksimum pada kenaikkan tegangan input kalibrator masing-masing yaitu mencapai 0,013 V - 0,0288V dan 0,21% - 0,41% pada daerah kerja 0,041V-0,05V. Kesalahan absolut maksimum dan  kesalahan relatif maksimum dengan penurunan tegangan input kalibrator masing-masing yaitu mencapai 0,011V-0,034V dan 0,025% - 0,034% pada daerah kerja 0,035V - 0,049V. Sensor potensial listrik yang diperoleh pada penelitian ini memenuhi syarat untuk  digunakan sebagai perangkat penunjang receiver Controlled Source Electromagnetic (CSEM). Kata kunci: Sensor potensial listrik, kalibrasi, CSEM, receiver.
Designing and Development of 30 KV DC Rectifier Amplifier for Polling Optimization on PVDF Thin Film Hartono, Ambran; Djamal, Mitra; Satira, Suparno; Bahar, Herman; Ramli, Ramli; Dadang, Dadang
Jurnal ILMU DASAR Vol 15 No 1 (2014)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (734.167 KB) | DOI: 10.19184/jid.v15i1.624

Abstract

DC high voltage amplifier is one of the important components to support of PVDF thin films polling equipment. Hardware polling is a very important tool in the characterization of PVDF thin films to increase piezoelectric properties. The existence of the problem will be difficult to obtain a high voltage DC sources of lead in the market encouraged us to design and create high-voltage DC source. In research that has been done I've been able to design and create high-voltage amplifier 30 KV DC as a producer of high electric field. To validate the performance of this high voltage DC amplifier has created further testing and measuring the output voltage. Testing is performed to determine the precision, accuracy and stability of the output voltage of the amplifier for more than 60 minutes. From the test results and output measurements performed show that the relative error of 4.5%. Tool output stability is good enough for a span of 30 minutes. This indicates that the design and manufacture of high DC voltage gain have been successful.   Keywords: DC Amplifier, Electric field, High voltage, Polling, PVDF Film
PEMBUATAN DAN KARAKTERISASI DATA LOGGER PADA SISTEM DETEKSI PERANGKAT ELEKTROMAGNETIK INDUKSI Indrasari, Widyaningrum; Nanda, Rahmondia; Djamal, Mitra
Jurnal Spektra Vol 16, No 1 (2015): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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Abstract

AbstrakTelah dilakukan pembuatan dan karakterisasi data logger sebagai perangkat akuisisi data digital pada sistem deteksi elektromagnetik induksi. Perangkat dibangun menggunakan ADC (Analog to Digital Converter) 16-bit dengan kecepatan 500 kilo samples per second (ksps). Untuk mengendalikan kerja ADC digunakan prosesor jenis mikrokontroler ATmega64A, sementara sebagai rangkaian pendukung kerja sistem digunakan multiplekser, rangkaian penguat, filter aktif lolos rendah Sallen Key tipe Butterworth, dan program antar muka. Sistem akuisisi data yang dibangun dapat merekam sinyal dengan frekuensi maksimum 10 kHz dari empat saluran masukan (channel). Rentang tegangan yang digunakan adalah ±2,5 Volt dengan resolusi ADC 76 µV, dan dapat mengakuisisi data setiap 2 µs. Hasil karakterisasi menggunakan input tegangan DC dari kalibrator diperoleh kurva keluaran ADC masing-masing channel mempunyai persamaan yang cukup identik dengan gradien sebesar 0,90. Sedangkan hasil karakteristik ADC terhadap sumber tegangan AC dari sensor magnetik fluxgate, menunjukkan adanya distorsi pada sinyal dengan frekuensi > 6 kHz.AbstractIt has been made and characterized data logger as a digital data acquisition devices on the electromagnetic induction detection system. This device was built using the ADC (Analog to Digital Converter) of 16-bit with the speed of 500 kilo samples per second (KSPS). The processors of microcontroller ATmega64A used as a controller of ADCs working. Several electronics circuits was used as a working supporting system, there are a multiplexer circuit, an amplifier circuit, an active low pass filter (Sallen-Key filter type Butterworth), and the interface program. Data acquisition system consists of four channels which is able to record the signal with a maximum frequency of 10 kHz. The working voltage range used is ± 2.5 Volts, with ADCs resolution of 76 μV, and able to obtain data every 2 μs. The characterization result of ADCs output using a DC voltage input from the calibrator, obtained that ADC output curve of each channel identical equation with a gradient of 0.90. Meanwhile the characterization result of ADCs output using the AC voltage source of fluxgate magnetic sensors, showed a distortion in a signal with a frequency > 6 kHz .Keywords: electromagnetic induction, data logger, ADC, resolution, fluxgate
THE IMPLEMENTATION OF DISAGGREGATION ALGORITHM IN THE ANALYSIS OF ENERGY CONSUMPTION BASED ON THE INTERNET-OF- THINGS TECHNOLOGY H, Husein; Alviori, Aditya; Budiman, Maman; Djamal, Mitra
AGRIBUSINESS JOURNAL Vol 13, No 1 (2019): AGRIBUSINESS JOURNAL
Publisher : Departement of Agribusiness Faculty of Science and Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (537.936 KB) | DOI: 10.15408/aj.v13i1.11869

Abstract

The effort to reduce the mass energy usage without involvement of consumers is not effective. Thereby, creating a pathway for anyone of consumer to be much more involved in the energy-saving effort. The implementation of disaggregation algorithm in the analysis of energy consumption is to recognize when and which appliance has the largest energy consumption and being able to control the state of all appliances from anywhere. In this research, the principle of disaggregation is event-based and low-sampling data frequency. A KWH-meter is used to send power data to the cloud server via MQTT protocol. The cloud server gathers the energy-consumption data, analyses them and then disaggregates them. The output of the disaggregation algorithm would tell the state (on/off), the average power and the percentage of energy consumed by each appliances. The output will then be sent from the cloud server to Android Apps via MQTT protocol. Then the consumer can easily access and control the energy consumption from their smartphone after knowing it through the disaggregation algorithm.
Multi-wavelength Fibril Dynamics and Oscillations above Sunspot-II Wave Propagation Signature Mumpuni, Emanuel Sungging; Herdiwijaya, Dhani; Djamal, Mitra; Djamaluddin, Thomas
Journal of Mathematical and Fundamental Sciences Vol. 50 No. 3 (2018)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2018.50.3.4

Abstract

In this work, the dynamics of one particular fibril were investigated through high-resolution multi-wavelength images with high cadence obtained from the Dutch Open Telescope. Based on exceptional observation data of Active Region 10789, 13th July 2005, we investigated the alternating fibril pattern using tomography of the multi-wavelength band, consisting of the hydrogen alpha line center and also the blue wing, the calcium II H line, and the G-band. Phase difference and coherence analyses were conducted for several points along the fibril and (k, ω) analysis was conducted to understand the wave interaction and its mechanism in the propagation process. Our findings suggest short- to long-period transitions along the fibril with coherence in 10-min oscillations in the penumbra.
Pengukuran Medan Magnet Lemah Menggunakan Sensor Magnetik Fluxgate dengan Satu Koil Pick-Up Djamal, Mitra; Setiadi, Rahmondia Nanda
Journal of Mathematical and Fundamental Sciences Vol. 38 No. 2 (2006)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2006.38.2.2

Abstract

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%.
PEMBUATAN DAN KARAKTERISASI DATA LOGGER PADA SISTEM DETEKSI PERANGKAT ELEKTROMAGNETIK INDUKSI Indrasari, Widyaningrum; Nanda, Rahmondia; Djamal, Mitra
Spektra: Jurnal Fisika dan Aplikasinya Vol 16 No 1 (2015): SPEKTRA, Volume 16 Nomor 1, Juni 2015
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (248.601 KB)

Abstract

Abstrak Telah dilakukan pembuatan dan karakterisasi data logger sebagai perangkat akuisisi data digital pada sistem deteksi elektromagnetik induksi. Perangkat dibangun menggunakan ADC (Analog to Digital Converter) 16-bit dengan kecepatan 500 kilo samples per second (ksps). Untuk mengendalikan kerja ADC digunakan prosesor jenis mikrokontroler ATmega64A, sementara sebagai rangkaian pendukung kerja sistem digunakan multiplekser, rangkaian penguat, filter aktif lolos rendah Sallen Key tipe Butterworth, dan program antar muka. Sistem akuisisi data yang dibangun dapat merekam sinyal dengan frekuensi maksimum 10 kHz dari empat saluran masukan (channel). Rentang tegangan yang digunakan adalah ±2,5 Volt dengan resolusi ADC 76 µV, dan dapat mengakuisisi data setiap 2 µs. Hasil karakterisasi menggunakan input tegangan DC dari kalibrator diperoleh kurva keluaran ADC masing-masing channel mempunyai persamaan yang cukup identik dengan gradien sebesar 0,90. Sedangkan hasil karakteristik ADC terhadap sumber tegangan AC dari sensor magnetik fluxgate, menunjukkan adanya distorsi pada sinyal dengan frekuensi > 6 kHz. Abstract It has been made and characterized data logger as a digital data acquisition devices on the electromagnetic induction detection system. This device was built using the ADC (Analog to Digital Converter) of 16-bit with the speed of 500 kilo samples per second (KSPS). The processors of microcontroller ATmega64A used as a controller of ADC's working. Several electronics circuits was used as a working supporting system, there are a multiplexer circuit, an amplifier circuit, an active low pass filter (Sallen-Key filter type Butterworth), and the interface program. Data acquisition system consists of four channels which is able to record the signal with a maximum frequency of 10 kHz. The working voltage range used is ± 2.5 Volts, with ADC's resolution of 76 μV, and able to obtain data every 2 μs. The characterization result of ADC's output using a DC voltage input from the calibrator, obtained that ADC output curve of each channel identical equation with a gradient of 0.90. Meanwhile the characterization result of ADC's output using the AC voltage source of fluxgate magnetic sensors, showed a distortion in a signal with a frequency > 6 kHz . Keywords: electromagnetic induction, data logger, ADC, resolution, fluxgate
The Reliability of Wireless Sensor Network on Pipeline Monitoring System Prihtiadi, Hafizh; Djamal, Mitra
Journal of Mathematical and Fundamental Sciences Vol. 49 No. 1 (2017)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2017.49.1.5

Abstract

The wireless sensor network (WSN) is an attractive technology, which combines embedded systems and communication networks making them more efficient and effective. Currently, WSNs have been developed for various monitoring applications. In this research, a wireless mesh network for a pipeline monitoring system was designed and developed. Sensor nodes were placed at each branch in the pipe system. Some router fails were simulated and the response of each node in the network was evaluated. Three different scenarios were examined to test the data transmission performance. The results proved that the wireless mesh network was reliable and robust. The system is able to perform link reconfiguration, automatic routing and safe data transmission from the beginning node to the end node.
A Novel Ternary CoFe2O4/CuO/CoFe2O4 as a Giant Magnetoresistance Sensor Ramli, Ramli; Hartono, Ambran; Sanjaya, Edi; Aminudin, Ahmad; Khairurrijal, Khairurrijal; Haryanto, Freddy; Imawan, Cuk; Djamal, Mitra
Journal of Mathematical and Fundamental Sciences Vol. 48 No. 3 (2016)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2016.48.3.4

Abstract

This paper reports the results of a study relating to the synthesis of a novel ternary CoFe2O4/CuO/CoFe2O4 thin film as a giant magnetoresistance (GMR) sensor. The CoFe2O4/CuO/CoFe2O4 thin film was prepared onto silicon substrate via DC magnetron sputtering with the targets facing each other. X-ray diffraction was used to determine the structure of the thin film and a 4-point method was used to measure the MR ratio. The GMR ratio is highly dependent on the ferrimagnetic (CoFe2O4) and nonmagnetic (CuO) layer thickness. The maximum GMR ratio at room temperature obtained in the CoFe2O4/CuO/CoFe2O4 thin film was 70% when the CoFe2O4 and the CuO layer had a thickness of 62.5 nm and 14.4 nm respectively.
Co-Authors Ahmad Aminudin Alviori, Aditya Ambran Hartono Aminah, Nina Siti Ari Setiawan Cut Novianti Rachmi, Cut Novianti DADANG DADANG Danang Trihatmoko, Danang Darmawan, Herlan Dasapta Erwin Irawan, Dasapta Erwin Deny Juanda Puradimaja Djamaluddin, Thomas Evita, Maria Freddy Haryanto H, Husein Hendra Gunawan Herdiwijaya, Dhani Herman Bahar Hufri Hufri iful amri, iful Imam Suyanto Imawan, Cuk irwan meilano Irzaman Irzaman Jefriyanto, Wilson Juneman Abraham Khairurrijal khairurrijal Mahfudz, H Mochammad Tanzil Multazam, Mochammad Tanzil Moh Yasin Mukti, Rino Rakhmata Mulyaningsih, Indrya Mumpuni, Emanuel Sungging Pambudi, Ismail Rizka Perdinan Perdinan, Perdinan Prihtiadi, Hafizh Putra, Heriansyah R. N. Setiadi Rahmondia Nanda Rahmondia Nanda Setiadi Ramli Ramli Retna Apsari, Retna Saka, Bergita Gela M. Sanjaya, Edi Sanjaya, Yogie Sari, Mona Berlian Sari, Mona Berlian Sparisoma Viridi Suparno Satira Suprijadi Suprijadi Suryanto, Wiwit Umiatin U, Umiatin Wahyu Srigutomo Wahyudi Wahyudi Widyaningrum Indrasari, Widyaningrum Yudi Nugraha Bahar Yuliantini, Lia Yuliantini, Lia Yulkifli Yulkifli Zul Anwar