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All Journal International Journal of Electrical and Computer Engineering Bulletin of Electrical Engineering and Informatics Jurnal Ilmiah Teknik Elektro Komputer dan Informatika (JITEKI) Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Instrumentasi Makara Journal of Technology International Journal of Electrical, Computer, and Biomedical Engineering (IJECBE)
Retno Wigajatri Purnamaningsih
Departemen Teknik Elektro, Fakultas Teknik, Universitas Indonesia, Depok
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics

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Analysis of Bare Uniform Fiber Bragg Grating Sensor for Measuring Strain on the Landing Gear of the LSU-02 Unmanned Aircraft Anwar, Rudi Choirul; Purnamaningsih, Retno Wigajatri; Rahardjo, Sasono; Hamidah, Maratul; Martha, Aryandi; Firdaus, Muhammad Yusha; Pramudya, Tinova
International Journal of Electrical, Computer, and Biomedical Engineering Vol. 2 No. 3 (2024)
Publisher : Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62146/ijecbe.v2i3.70

Abstract

This paper reports the results of testing a bare uniform FBG sensor for measuring strain occurring on the landing gear of an unmanned aircraft. The landing gear used in this research is made from carbon fiber, known for its high strength and stiffness. The FBG sensor is positioned 20 cm from the center point of the landing gear, specifically at the curved section, to optimize strain detection. Static testing to measure strain was conducted by applying varying mass loads from 0 to 9 kilograms to test the sensor's response to load changes. Measurement results show a constant measurement threshold at a load of 50 grams, indicating sensor stability within that load range, with a measurement resolution of 0.1654 microstrain. Comparison of FBG measurement results with the BLFAB-55 strain gauge sensor revealed a measurement difference of 5.9%. Further research was conducted by introducing disturbances in the form of wind at speeds of 5 m/s and 10 m/s, and temperature disturbances of 30°C and 45°C. The results showed that the 45°C temperature disturbance had the most significant impact on the strain changes measured by the FBG, with an increase in strain value of 265% compared to when there was no disturbance.
Development of a 1550 nm LiDAR System Using Galvanometer and i-ToF Method for Distance Measurement and 2D Object Reconstruction Hutagalung, Febrian Winston; Purnamaningsih, Retno Wigajatri; Nainggolan, Sahat Pandapotan; Rofianingrum, Mefina Yulias; Hapiddin, Asep; Hanto, Dwi
International Journal of Electrical, Computer, and Biomedical Engineering Vol. 3 No. 3 (2025)
Publisher : Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62146/ijecbe.v3i3.129

Abstract

LiDAR (Light Detection and Ranging) is a high-precision distance measurement technology based on laser light reflection. This study develops a galvanometer-based LiDAR system utilizing the indirect Time of Flight (i-ToF) method with 100 MHz sinusoidal modulation and a 1550 nm eye-safe laser diode. The system is designed to measure distance and identify the shape of 2D objects. The system was tested through phase difference measurements, galvanometer response, and flat-surface mapping at distances of 25 cm and 35 cm. The measurement results demonstrate high linearity and stability up to a maximum range of 1.5 meters, in accordance with the 360° phase difference (∆φ) limitation. The measurements of object dimensions in the form of an aluminum foil-covered plate at distances of 25 cm (1.76 cm × 2.63 cm) and 35 cm (2.45 cm × 3.66 cm) indicate that increasing the distance between the object and the system results in a wider coverage area but with reduced spatial resolution. At a distance of 25 cm, the light beam shifts by 0.436 cm/1°∆φ, whereas at 35 cm it shifts by 0.611 cm/1°∆φ. Furthermore, the limited active area of the photodetector was identified as the main factor restricting the detection coverage. This research opens opportunities for further development, particularly in optimizing galvanometer angle adjustments and enhancing the photodetector’s active area to expand coverage and improve measurement accuracy under various operating conditions.
KARAKTERISASI NILAI CURRENT SHUNT 1 MILIOHM PADA RENTANG ARUS UJI 10 A HINGGA 100 A UNTUK MEMBANGUN KETERTELUSURAN MANDIRI STANDAR ARUS DC DI LABORATORIUM SNSU BSN Ashri Khusnul Chotimah; Retno Wigajatri Purnamaningsih; Lukluk Khairiyati
Instrumentasi Vol 49, No 2 (2025)
Publisher : National Standardization Agency of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31153/instrumentasi.v49i2.808

Abstract

Telah dilakukan karakterisasi nilai current shunt miliohm pada rentang arus uji 10 A hingga 100 A yang digunakan sebagai standar arus DC di Laboratorium SNSU BSN. Pengukuran dilakukan menggunakan metode komparasi terhadap standar resistor 1 miliohm dan 10 miliohm melalui Direct Current Comparator (DCC) Resistance Bridge dan High Current Range Extender. Hasil karakterisasi menunjukkan bahwa nilai current shunt berada pada rentang 0,999873 miliohm hingga 1,000029 miliohm dengan ketidakpastian pengukuran 0,000058 miliohm. Tren hasil pengukuran menunjukkan adanya kenaikan pada nilai current shunt dengan persamaan linier y = 1,8301789E-6x + 0,99984. Selanjutnya, hasil pengukuran dibandingkan dengan laboratorium SCL Hong Kong dan KRISS Korea. Berdasarkan analisis Error normalised (En) diperoleh nilai yang menunjukkan kesesuaian hasil pengukuran dengan kedua laboratorium tersebut.  
Characterization of Fiber Bragg Grating Accelerometer for Underwater Vibration Detection Juan Michael Kane Gani; Retno Wigajatri Purnamaningsih; Sasono Rahardjo
Jurnal Penelitian Pendidikan IPA Vol 10 No 6 (2024): June
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i6.7760

Abstract

In this paper, the results of the characterization of a Fiber Bragg Grating (FBG) Accelerometer for detecting vibrations underwater are reported. The FBG Accelerometer, consisting of three FBGs, is utilized to detect underwater vibrations in three-dimensional directions. A water pump, with positions varied from 0 to 10 cm, is employed as the vibration source. Furthermore, the experimental results are presented in the form of the peak wavelength shift reflected by the FBG (ΔλB) and frequency. From the experiment results, it is shown that with increasing distance, ΔλB decreases linearly with successive gradients of 0.0058 nm/cm; 0.0059 nm/cm; and 0.0045 nm/cm. for FBG X, Y, and Z. It is also shown that with increasing distance, there is a decrease in frequency from 50 Hz for FBGs X, Y, and Z to 39 Hz; 38 Hz; and 40 Hz for FBGs X, Y, and Z respectively.
Design of a 1x4 Optical Power Divider Based on Y-Branch Using III-Nitride Semiconductor Nauval Franata; Retno Wigajatri Purnamaningsih
Jurnal Ilmiah Teknik Elektro Komputer dan Informatika Vol. 8 No. 1 (2022): March
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/jiteki.v8i1.23646

Abstract

Optical communications are identified as a technology that is able to meet future demands. As a passive component of optical communication, optical power dividers play an essential role. We propose a novel 1x4 optical power divider design, which is a combination of an optical power divider design using a Y-branch and an optical power divider using rectangular waveguides utilizing mode coupling phenomena from our previous researched designs. The 1x4 optical power divider design using three Y-branches and utilizing mode coupling phenomena is described in this work. The design consists of three sections: an input Y-branch, rectangular waveguides, and two output Y-branches. By utilizing mode coupling phenomena with 3 rectangular waveguides, the optical power was transferred from one waveguide to its adjacent, so we obtained a wider splitting angle at the input Y-branch. The design was optimized using the beam propagation method (BPM) at a wavelength for optical communication of λ = 1.55 µm. We optimized various parameters such as the width and thickness of the waveguide, splitting angles, coupling gaps, and coupling lengths by doing numerous experiments. The result shows that the proposed design was successfully split into four outputs with 0.14 dB power imbalance at four output ports and 0.12 dB excess loss through the design. The excess loss and power imbalance at varied wavelengths were also observed. The distribution of excess loss and power imbalance is almost stable through the C-band range (1530-1565 nm). The proposed design shows the possibility of a new wide-angle optical power divider design and demonstrates the development possibilities of optical interconnections at wavelengths of 1530-1565 nm.
Experimental Characterization of a Tri-Axial FBG Accelerometer for Underwater Thruster-Induced Vibration Detection Muhammad Alif Rahman Sukapraja; Retno Wigajatri Purnamaningsih; Sasono Rahardjo; Maristya Rahmadiansyah; Tinova Pramudya
International Journal of Electrical, Computer, and Biomedical Engineering Vol. 4 No. 1 (2026)
Publisher : Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62146/ijecbe.v4i1.226

Abstract

This paper presents an experimental engineering validation of a tri-axial Fiber Bragg Grating (FBG) accelerometer for detecting thruster-induced vibrations in submerged environments. The sensor integrates three orthogonally arranged FBG elements within a compact, waterproof housing, enabling vibration measurements along three spatial directions. Experiments were conducted using a DC thruster as a repeatable vibration source under both free-air and underwater conditions. Comparative results show a marked increase in Bragg wavelength shift (ΔλB) when submerged, with peak-to-peak variations reaching approximately 0.0267 nm on non-primary axes and up to 0.1005 nm on the axis aligned with the excitation, compared to approximately 0.0044 nm in free air. Sensor sensitivity, repeatability, and hysteresis were evaluated through cyclic loading-unloading tests. The maximum hysteresis observed was 0.0053 nm, corresponding to approximately 5% of the full-scale wavelength shift, indicating stable and predominantly elastic behavior.
Co-Authors Andrianto Handojo Anwar, Rudi Choirul Ashri Khusnul Chotimah Dimitris Pavlidis, Dimitris Dini Andiani Dini Andiani, Dini Dini Marhaeni Elecevani Dwi Hanto Elhadj Dogeche, Elhadj Elhadj Dogheche Elhadj Dogheche Firdaus, Muhammad Yusha Franata, Nauval Hamidah, Maratul Hapiddin, Asep Hendrik Kurniawan Hutagalung, Febrian Winston Irma Saraswati Irwan Kustianto Juan Michael Kane Gani Junivan Sulistianto Luh Putu Ratna Sundari Lukluk Khairiyati Maratul Hamidah Maristya Rahmadiansyah Martha, Aryandi Mefina Yulias Rofianingrum Muhammad Alif Rahman Sukapraja Muhammad Yusha Firdaus Nainggolan, Sahat Pandapotan NB Prihantini Nibras Yayienda Nji Raden Poespawati Nyi Raden Poespawati Nyi Raden Poespawati, Nyi Pramudya, Tinova Prihantini, Nining Betawati Rizqy Pratama Rahman Sasono Rahardjo Sasono Rahardjo Sasono Rahardjo Sasono Rahardjo, Sasono Setyawan, Rahmatul Yoga Tinova Pramudya Tomy Abuzairi