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All Journal International Journal of Electrical and Computer Engineering BERKALA FISIKA Bulletin of Electrical Engineering and Informatics Jurnal Fisika Unand Telaah Science and Technology Indonesia Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Ilmu Fisika Journal Of Management Science (JMAS) Journal of Technomaterial Physics Journal of Artificial Intelligence and Digital Business Science, Technology, and Communication Journal
Bambang Widiyatmoko
Group THz-Photonics- Bidang Instrumentasi Fisis dan Optoelektronika Pusat Penelitian Fisika – Lembaga Ilmu Pengetahuan Indonesia (LIPI)
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Physics

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PENGEMBANGAN SISTEM MONITORING ALIRAN DAN KUALITAS AIR SUNGAI MENGGUNAKAN PELAMPUNG BERBASIS SMART ENVIRONMENT Nasution, Subhan Fahmi; Harmadi, Harmadi; Suryadi, Suryadi; Widiyatmoko, Bambang
Jurnal Ilmu Fisika Vol 16 No 1 (2024): March 2024
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.16.1.1-12.2024

Abstract

Efficient and accurate river water quality monitoring is needed to support laboratory testing based on on-site sampling. Therefore, we have developed a monitoring system for river flow and water quality using sensor-equipped buoys and the Internet of Things (IoT) concept. An ESP32 NodeMCU microcontroller integrated with WiFi and compatible with Arduino IDE is used in the system. The buoy is equipped with GPS to determine the position and flow speed and sensors to measure water quality parameters of pH and temperature. Data on position, flow velocity, and water quality parameters are transmitted over a WiFi network using the MQTT protocol. The data is recorded by the buoy and uploaded and displayed on the adafruit.io platform. Positioning was done by comparing the values displayed on the Neo-6M GPS with the Maps application on the smartphone. The results show that the GPS coordinate values are accurate. The water quality parameter values obtained have an error rate of 3.3% for the pH sensor and 1.02% for the temperature sensor. Thus, the system we have developed has the potential to be used as a substitute for field sampling-based river water quality monitoring systems.
Analysis of the Management of zakat and asn infaq in the City of Cilegon Banten Widiyatmoko, Bambang; Bahri, Syaeful; Syarifuddin, Efi
Junal Ilmu Manajemen Vol 7 No 1 (2024): January: Management Science and Field
Publisher : Institute of Computer Science (IOCS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35335/jmas.v7i1.410

Abstract

One of the pillars of Islamic philanthropy is Zakat. Undoubtedly, it must be done correctly and comply with applicable sharia. The aim of this research is to describe how Zakat and Infaq are managed for ASN Cilegon City and how effective and efficient Zakat management is in Baznas Cilegon City Banten. The approach taken in this research uses a qualitative approach with the literature study method (case study). Data sources in research collect two sources, namely primary and secondary. Primary informants directly include (the community, ASN and Cilegon City Baznas administrators). Secondary, namely strengthening data from primary such as: Journal articles, E-Books, Online Proceedings, magazines, newspapers and other internet media. Meanwhile, data collection techniques include observation interviews, documentation and triangulation. The analysis technique used in this research is using Miles and Huberman's theory of data reduction, data display, data verification and drawing conclusions. So, this research resulted in optimizing the distribution of Baznas, the efficiency of distributing Zakat funds, the percentage of distribution efficiency levels, the percentage of Cilegon City Zakat management. So, it can be concluded that Cilegon City Baznas maximizes existing human resources (HR) both internally and externally to Baznas itself. Research findings show that optimization can be said to be quite optimal. For 2018–2022, the average distribution efficiency of zakat funds is 95.8%.
Investigation of Transmission and Reflection of Single Mode Fiber Bragg Grating Irawan, Dedi; Saktioto; Azhar; Hanto, Dwi; Widiyatmoko, Bambang
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.v10i6.7209

Abstract

The use of Single Mode Fiber Bragg Grating (SMFBG) has been increasing in recent years due to its compact size, low cost, fast response and immunity to electromagnetic interference. It is commonly integrated into medical devices for long-distance light transmission and collection due to its high flexibility, low propagation loss, compatibility and tolerance to electromagnetic interference. SMFBG is a device made of thin glass material that is used as a medium for transmitting information in the form of light signals sourced from lasers or LEDs from one location to another. It consists of 3 main components, namely core with a certain grating, blanket (cladding) and jacket (coating). The advantage of optical fiber is that the data when transmitted is converted into light so as to reduce the risk of data damage. Other advantages include very small size, minimal interference with electromagnetic waves, resistance to temperature changes, attenuation when the transmission process is small enough, and large enough bandwidth. The orientation of this literature review is to understand the concept of optical fiber, the concept of reflection and refraction, and how light propagates in optical fiber.
Study of Microbending Loss Single Mode Optic Fiber in Sand Powder Against Pressure Widiyatmoko, Bambang
Journal of Technomaterial Physics Vol. 3 No. 1 (2021): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v3i1.5549

Abstract

Research has been carried out to further investigate specifically the effect of sand powder, both the size of the sand grains and the thickness of the sand powder on the photodetector output as an advanced study of the single-mode optical fiber microbending loss theory in sand grains to pressure. This was done to investigate the response of optical fibers due to microbending loss to the load and determine the size of the sand particles that are most effectively used as a compiler of load sensors. The principle works to test the response of load sensors based on single-mode fiber optic microbending loss in the form of photodetector output when given a large variety of pressure. The method used in this research is to observe the reduction in the intensity of the light transmitted through optical fibers in the form of a voltage drop that is read by MMD that is connected to the photodetector. The reduced light intensity shows that the load sensor experiences optical attenuation of the laser as a light source with a wavelength of 1550 nm and a power of 1.47 mW. Microbending loss is caused by mechanical pressure that can change the direction of optical signal transmission and the radius of the curve is equal to or less than the diameter of a bare optical fiber. Observations were made using 12 load sensors with variations in the size of the sand grains in each diameter of the hose. The results of this study obtained the size of the most effective grains of sand providing microscopic curvature in the optical fiber that is 0.05 mm in terms of the correlation between the response of sensors with various diameters to changes in pressure.
Design and characterization of a graphene-coated fiber Bragg grating gas sensor for low-concentration methane and carbon dioxide detection Irawan, Dedi; Hanto, Dwi; Widiyatmoko, Bambang
Science, Technology, and Communication Journal Vol. 6 No. 2 (2026): SINTECHCOM Journal (February 2026)
Publisher : Lembaga Studi Pendidikan dan Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v6i2.355

Abstract

Early detection and accurate monitoring of methane (CH4) and carbon dioxide (CO2) at low concentrations are essential for industrial safety, environmental monitoring, and greenhouse gas mitigation. Conventional gas sensors, including electrochemical and semiconductor types, suffer from environmental sensitivity, frequent calibration needs, and limited long-term stability. Therefore, more stable, sensitive, and intrinsically safe sensing technologies are required, especially for high-risk environments. Fiber Bragg grating (FBG) sensors offer key advantages as passive optical devices that are immune to electromagnetic interference, compact, and capable of multiplexed operation. This study presents the design and characterization of a graphene-coated FBG sensor for low-concentration CH4 and CO2 detection. The FBG was fabricated using the phase mask technique, followed by cladding etching to enhance evanescent field interaction with the surrounding medium. A graphene layer was synthesized via chemical vapor deposition (CVD) and transferred onto the etched fiber surface to serve as the active sensing layer. Gas adsorption on graphene induces refractive index variations, producing measurable Bragg wavelength shifts monitored by a high-resolution optical interrogator. Experiments were conducted at concentrations up to 100 ppm under controlled temperature and humidity conditions. Results show sensitivities of 12.4 pm/100 ppm for CO2 and 9.7 pm/100 ppm for CH4, with strong linearity (R2 > 0.98), fast response time (< 15 s), low hysteresis, and good long-term stability. The proposed FBG-graphene sensor demonstrates strong potential for reliable real-time gas monitoring in industrial and environmental applications.
Co-Authors Aditya Dwi Prasetio, Aditya Dwi Andi Setiono Azhar Azhar Azhar dedi irawan Dwi Bayuwati Dwi Hanto Dwi Hanto Fitmawati Fitmawati Harmadi Harmadi Harmadi Haryono, Wasis Husdi, Irwan Rawal Imam Mulyanto Iyon T. Sugiarto, Iyon T. Marwin, Azwir Muhammad Sahal Nasution, Subhan Fahmi Nelfyenny, Nelfyenny Prabowo Puranto Ramadhan, Khaikal Rodhiah, Salsa Ariani Rofianingrum, Mefina Y. Saktioto Saktioto Saktioto Samudra, Achdiyat Ilyasa Satrio, Teguh Suryadi Suryadi Sutoyo Sutoyo Sutoyo Syaeful Bahri Syarifuddin, Efi Syawal, Rio Mulya Thomas B. Waluyo, Thomas B.