Rinda Hedwig

Rinda Hedwig
Binus University | binus · Department of Computer Engineering

Dr. of Engineering

About

87
Publications
34,704
Reads
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953
Citations
Citations since 2017
22 Research Items
554 Citations
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
Additional affiliations
January 2004 - present
Maju Makmur Mandiri Research Center
Position
  • Researcher
September 1997 - present
Maju Makmur Mandiri Research Center
Position
  • Spectrochemical Analysis using High Power Pulse Laser
Education
September 1999 - September 2002
University of Indonesia
Field of study
  • Opto-Electrotechniques and Laser Applications
September 1996 - September 1998
University of Indonesia
Field of study
  • Opto-Electrotechniques and Laser Applications
September 1991 - September 1995
Binus University
Field of study
  • Computer Engineering

Publications

Publications (87)
Article
Full-text available
Self-absorption, which is known to severely disturb identification of the emission peak intensity in emission-based spectroscopy, was first studied using ordinary single pulse laser-induced breakdown spectroscopy (LIBS). It was found that severe self-absorption, with an evident self-reversal, occurs in the resonance emission lines of high concentra...
Article
Several experiments are performed to explore the possible benefits of using bamboo charcoal as a sample holder for rapid powder analysis using laser-induced breakdown spectroscopy at low-pressure helium ambient gas. Standard powdered samples such as ZnS and CuSO4 are used to demonstrate the feasibility of using cheap and widely available bamboo cha...
Article
Full-text available
Laser-induced breakdown spectroscopy (LIBS) to detect the light elements such as lithium (Li) and boron (B) and heavy elements such as copper (Cu) and lead (Pb) in raw fish samples is reported in this work. This is made possible by understanding that the soft target absorbs recoil energy and as a result, the ablated atoms gushing from the soft targ...
Article
Full-text available
A series of experiments are conducted for the study of time-dependent variations of major emission from the metastable excited He generated in various experimental conditions. Different Nd:YAG laser pulse widths and pulse energies, as well as purity of the He gas, are employed for studying quenching effects including the use of a Cu target in an ex...
Article
Full-text available
Global pollution from toxic metal waste has resulted in increased research on toxic metal adsorption. A cellulose acetate–polyurethane (CA–PU) film adsorbent was successfully prepared in this research. The cellulose acetate–polyurethane film adsorbent was prepared with a polycondensation reaction between cellulose acetate and methylene diphenyl dii...
Article
Full-text available
The use of polymeric material in heavy metal removal from wastewater is trending. Heavy metal removal from wastewater of the industrial process is of utmost importance in green/sustainable manufacturing. Production of absorbent materials from a natural source for industrial wastewater has been on the increase. In this research, polyurethane foam (P...
Article
Full-text available
A unique approach for achieving total suppression of the self-absorption effect in laser-induced breakdown spectroscopy (LIBS) has been demonstrated employing a previously published technique of laser-induced plasma spectroscopy utilizing a helium (He) metastable excited state (LIPS-He*).This achievement was attained by the use of the He metastable...
Article
Full-text available
A study is conducted on the detailed static and dynamic characteristics of plasma and the resulting emission spectral qualities generated by a femtosecond (fs) laser irradiation compared with those produced by nanosecond (ns) laser irradiation at a reduced ambient air pressure of 0.65 kPa. It is shown that both plasmas feature a tiny primary and a...
Article
Presented in this paper are the results of practical application of laser-induced breakdown spectroscopy to sensitive detection of rare earth elements (REEs) in trace amounts using a Cu subtarget supported stainless steel micro mesh (SSMM) powder sample holder. Powder samples containing separately a number of REEs (Yb, Y, Eu, and La) are measured u...
Article
Full-text available
This study is aimed at elucidating the physical processes responsible for the excellent spectral qualities in terms of full width at half maximum (FWHM) and signal to noise (S/N) ratio shown in a special double pulse laser induced spectroscopy. A part from the use of atmospheric He ambient gas, the achievement is due to the first laser for generati...
Article
Full-text available
Laser ablation chemical and spectroscopic studies of Calotropis procera, Chenopodium ambrosioides, and Nerium indicum leaves was performed using 1064 nm Nd: YAG laser in air at different pressure and time delay. These medicinal plant's leaves are used by local people for different diseases. The knowledge of medicinal and toxic metals in these plant...
Article
We report the results of an experimental study of food analysis using Nd:YAG nanosecond (ns) laser at various pulse energies in atmospheric ambient air and He ambient gas at different pressures. In contrary to previous results indicating the unfavorable applications of LIBS to food analysis using lower pulse energies and atmospheric ambient air, th...
Article
The laser induced breakdown spectroscopy (LIBS) experiment with a unique double pulse setup and operational procedure in low pressure (3 kPa) He ambient gas is performed for the study on the detection of light elements such as hydrogen (H) and deuterium (D) as well as elements of high excitation energies such as fluorine (F) and chlorine (Cl) which...
Article
Carbon detection is usually difficult to carry out with high sensitivity and minimally destructive effect. While the conventional laser induced breakdown spectroscopy (LIBS) method operated with atmospheric ambient air is well known as a powerful and versatile analytical tool, it suffers nevertheless from the low sensitivity of C detection when mea...
Article
Full-text available
Heavy metal pollution in water, especially in the North Jakarta area, has become severe from time to time. A heavy metal adsorbent is one of the alternative solutions to clean the waste water from industries before it is released into the environment. In this paper, we create pectin that has been proven to be an effective absorbent for heavy metal...
Article
Full-text available
A wide coverage spectral investigation on the muscle of river calm sample has been carried out using laser-induced breakdown spectroscopy for examining the overall profile of the emission spectra from the produced plasma. The basic apparatus of LIBS system used is a Nd-YAG laser and wide coverage optical multichannel analyzer (OMA) system. The rive...
Article
A time-resolved spectroscopic study is performed by using 125–500 micro-Joule (µJ) ps laser focused directly without the aid of microscope on a Cu plate sample in a variety of low-pressure ambient gases including air, helium and argon. It is shown that the ultrashort µJ laser-induced low-pressure plasma in Ar ambient gas exhibits the typical charac...
Article
An experimental study is performed on the time-dependent intensity variations of Zn emission focusing on the triplet (Zn I 481.0 nm) and singlet (Zn I 636.2 nm) emission lines induced under three experimental conditions. A single nanosecond (ns) Nd:YAG laser in standard laser-induced breakdown spectroscopy (LIBS) setup is employed for the investiga...
Article
An experimental study is conducted in search of the much needed experimental method for practical and minimally-destructive analysis of Hydrogen (H) and Deuterium (D) in nuclear power plant. For this purpose, a picosecond (ps) Nd-YAG laser is employed and operated with 300 µJ - 500 µJ output energies in a variety of ambient gases at various gas pre...
Conference Paper
The elemental detection of green bean of arabica and robusta coffee from Gayo Highland, Aceh-Indonesia, has been identified by using fundamental Nd-YAG Laser at 10 Torr of surrounding air gas pressure for distinguishing the characteristics of both coffees. As the preliminary study, we have detected the elements of K 766.49 nm, Na 588.9 nm, Ca 393.3...
Article
Full-text available
Detection of oil pollution in soil has been carried out using laser-induced breakdown spectroscopy (LIBS). A pulsed neodymium-doped yttrium aluminum garnet (Nd:YAG) laser (1,064 nm, 8 ns, 200 mJ) was focused onto pelletized soil samples. Emission spectra were obtained from oil-contaminated soil and clean soil. The contaminated soil had almost the s...
Article
This report presents the results of laser-induced breakdown spectroscopy (LIBS) study on biological and food samples of high water content using a picosecond (ps) laser at low output energy of 10 mJ and low-pressure helium ambient gas at 2 kPa. Evidence of excellent emission spectra of various analyte elements with very low background is demonstrat...
Article
An experimental study is performed on the comparative advantages of nanosecond (ns) and picosecond (ps) lasers in laser-induced breakdown spectroscopy (LIBS) analysis. The experiment focused on the relative efficiencies of the plasma emission induced by the two lasers in low-pressure Ar ambient gas for samples of various hardnesses. It is shown tha...
Article
Full-text available
A time-resolved spectroscopic study is performed on the enhancement signals of He gas plasma emission using nanosecond (ns) and picosecond (ps) lasers in an orthogonal configuration. The ns laser is used for the He gas plasma generation and the ps laser is employed for the ejection of fast electrons from a metal target, which serves to excite subse...
Article
An experimental study is conducted on the possibility and viability of performing hardnessmeasurement of the various stone and chert samples in low pressure (600 Pa) CO2 ambient gas, a condition that is encountered in the Mars atmosphere. For this study, a nanosecond Nd-YAG laser is employed to generate plasma emission from the samples with differe...
Conference Paper
This work is intended to asses the capability of LIBS for the detection of the tsunami sediment contamination in soil.LIBS apparatus used in this work consist of a laser system and an optical multichannel analyzer (OMA) system. The soil sample was collected from in Banda Aceh City, Aceh, Indonesia, the most affected region by the giant Indian Ocean...
Article
Full-text available
We have conducted an experimental study exploring the possible application of laser-induced breakdown spectroscopy (LIBS) for practical and highly sensitive detection of metal impurities in water. The spectrochemical measurements were carried out by means of a 355 nm Nd-YAG laser within N<sub>2</sub> and He gas at atmospheric pressures as high as 2...
Article
Full-text available
We report in this paper the results of an experimental study on the spectral and dynamical characteristics of plasma emission induced by 1 mJ picoseconds (ps) Nd-YAG laser using spatially resolved imaging and time resolved measurement of the emission intensities of copper sample. This study has provided the experimental evidence concerning the dyna...
Article
Full-text available
We report the results of experimental study on CN 388.3 nm and C I 247.8 nm emission characteristics using 40 mJ laser irradiation with He and N2 ambient gases. The results obtained with N2 ambient gas show undesirable interference effect between the native CN emission and the emission of CN molecules arising from the recombination of native C abla...
Article
Full-text available
A systematic study has been performed on the spectral characteristics of the full spectrum of He emission lines and their time-dependent behaviors measured from the He gas plasmas generated by a nanosecond neodymium-doped yttrium aluminum garnet laser. It is shown that among the major emission lines observed, the triplet He(I) 587.6 nm emission lin...
Article
Full-text available
— Face verification, a part of security systems, is widely used in many applications. This biometric application is more hygienic comparing with other biometric systems since there is no direct contact between face and camera. Moreover, it is a low cost setup. A sparse representation algorithm as a part of compressive sensing was used in this paper...
Article
Full-text available
— One of the main problems in current Global Positioning System (GPS) is the slow duration on updating the position. Moreover, current system uses two separated devices for a single purpose which consumes more power. This research develops a GPS tracking system which provides real time current position information by using High Speed Downlink Packe...
Article
Full-text available
A systematic study has been performed on the spectral characteristics of the full spectrum of He emission lines and their time-dependent behaviors measured from the He gas plasmas generated by a nanosecond neodymium-doped yttrium aluminum garnet laser. It is shown that among the major emission lines observed, the triplet He(I) 587.6 nm emission lin...
Article
Full-text available
Due to its superior advantageous over the conventional analytical tools, laser-induced breakdown spectroscopy (LIBS) technique nowadays is becoming an emerging analytical tools and it is expected to be new future super star of analytical tool. This technique is based on the use of optical emission from the laser-induced plasma for analyzing spectr...
Article
Full-text available
Solar energy is one form of the renewable energy which is very abundant in regions close to the equator. One application of solar energy is for street light. This research focuses on using the maximum power point tracking technique (MPPT), particularly the perturb and observe (P&O;) algorithm, to charge battery for street light system. The proposed...
Article
Full-text available
— Global Positioning System (GPS) in smart phone is a common application that is used in determining the position of the user. However, the navigation is still limited to open street and cannot be used in certain closed area such as in a sport club, playground or parks. In this research we develop an application based on Android which can determine...
Article
Full-text available
An experimental study has been performed on the pressure-dependent plasma emission intensities in Ar, He, and N2 surrounding gases with the plasma induced by either nanosecond (ns) or picosecond (ps) yttrium aluminum garnet laser. The study focused on emission lines of light elements such as H, C, O, and a moderately heavy element of Ca from an aga...
Article
Full-text available
A time-resolved orthogonal double pulse laser-induced breakdown spectroscopy (LIBS) with helium surrounding gas is developed for the explicit demonstration of time mismatch between the passage of fast moving impurity hydrogen atoms and the formation of thermal shock wave plasma generated by the relatively slow moving major host atoms of much greate...
Article
Full-text available
This research focused on enhancing K-SVD (EKSVD) algorithm to get optimum denoising process for an image. The new algorithm used emphasizes dictionary learning process in which it can reduce the noise at 0.05% low which almost equal to ordinary K-SVD algorithm. Moreover, EKSVD was able to reduce the time process for denoising for 40% faster than th...
Article
Full-text available
BINUS Square is a dormitory for students of Bina Nusantara University, Jakarta which provides Internet facility with wireless media. Since 2010, there have been many complaints on network performance such as slow connections or frequent break up of connections. Although the configuration and network capacity has been regularly fixed and upgraded, t...
Book
Full-text available
Buku ini merupakan kelanjutan dari buku seri pertama mengenai “Mengenal Alkitab Melalui Eksperimen Sederhana” yang disusun untuk memperingati 25 tahun berdirinya Paroki Santo Agustinus – Karawaci, Tangerang sekaligus untuk membantu guru-guru Sekolah Bina Iman / Sekolah Minggu dalam membangun iman dan kreativitas anak-anak berbasiskan sains. Menyaji...
Book
Full-text available
Buku ini disusun untuk memperingati 25 tahun berdirinya Paroki Santo Agustinus – Karawaci, Tangerang sekaligus untuk membantu guru-guru Sekolah Bina Iman / Sekolah Minggu dalam membangun iman dan kreativitas anak-anak. Menyajikan pengetahuan tentang iman hanya bisa efektif dengan dua cara yaitu menjadi contoh dan memberikan contoh. Seringkali kita...
Article
Full-text available
Our previous work on an innovative method of hydrogen (H) analysis using the specific characteristics of a TEA CO2 laser, “selective detection method of H”, has been improved to realize a high H sensitive analysis with a detection limit of several µg/g. For this purpose, first, we clarified the origin of the H emission disturbance coming from H2O m...
Article
A crucial safety measure to be strictly observed in the operation of heavy-water nuclear power plants is the mandatory regular inspection of the concentration of deuterium penetrated into the zircaloy fuel vessels. The existing standard method requires a tedious, destructive, and costly sample preparation process involving the removal of the remain...
Article
An experimental study of double pulse LIBS is performed for the development of highly sensitive and quantitative analysis of Cl and Ca for the strength evaluation of concrete. The two lasers employed are arranged in orthogonal geometry and operated for delayed ablation with delay time of 10 μs, using He ambient gas at atmospheric pressure. The very...
Article
This paper will discuss the design of a fully autonomous fire fighting robot which is able to navigate through a maze and navigate back to it's starting position. The maze is designed with few obstacles that must be avoided by the robot while navigating. A Modified Line-Maze Algorithm is introduced to navigate the robot through the maze and reach a...
Article
A microcontroller-based seismic shaking intensity meter is developed and tested. This device will be mounted in many high rise building that can be found mainly in big city like Jakarta. The device will record information on earthquake's magnitude in the building which is taken by using accelerometer; later on the data will be compared with the rea...
Article
A web-based open loop remote control robot in this paper is designed for surveillance application. The robot is a prototype of remote control toy car but it is controlled via web and not via radio wave as what we found nowadays. The robot is utilized with a camera where the surveyor can observe surrounding area via web and navigates the robot to re...
Article
Full-text available
The aim of this research is to design and produce a low cost Computer Numerical Control (CNC) machine which is equipped with interchangeable head for many applications especially for small-medium creative industry. The CNC machine has good flexibility where its head can be changed manually and easily between pen (impact-engraver) mounted and CO2 la...
Article
Full-text available
In this research an automobile license plate recognizer is developed in a mobile device based on the android platform to be used as an alternative solution to record road-side transactions, such as parking and fine. The license plate recognition is implemented using artificial neural network, where training of the neural network is carried out in a...
Article
Full-text available
An experimental study on picosecond laser induced plasma spectroscopy of a zircaloy sample with low-pressure surrounding helium gas has been carried out to demonstrate its potential applicability to three-dimensional quantitative micro-analysis of deuterium impurities in zircaloy. This was achieved by adopting the optimal experimental condition asc...
Article
Full-text available
An experiment was performed for the observation of H emission induced in a cooled laser-induced atmospheric pressure gas plasma of He atoms in their metastable excited state. The strong H emission detected clearly established, to the exclusion of other well known major excitation processes, the exclusive contribution of the He-induced excitation (H...
Article
Full-text available
An experimental study of ultraviolet (UV) laser-induced plasma spectroscopy (LIPS) on Ti samples with low-pressure surrounding He gas has been carried out to demonstrate its applicability to quantitative micro-analysis of deuterium impurities in titanium without the spectral interference from the ubiquitous surface water. This was achieved by adopt...