scholarly journals Analisis Korosifitas Baja Ringan dengan Metoda Laser Induced Breakdown Spectroscopy (LIBS)

Kappa Journal ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 1-9
Author(s):  
Siti Raudatul Jannah ◽  
◽  
Ni Nyoman Ratini ◽  
Windarjoto Windarjoto ◽  
Hery Suyanto ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Dissolved Oxygen ◽  
Mild Steel ◽  
Metal Surface ◽  
Delay Time ◽  
Electrochemical Reaction ◽  
Protective Layer ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Method has been carried out. Research is done on mild steel zincalume type with immersion treatment (NaCl 3.5%) for 10 days, and 30 days and without immersion. Mild steel is laser irradiated (Nd-YAG 1064 nm, 7 ns) with energy of 120 mJ, and the data is taken with an accumulation of 3, delay time of 0.5 µs. Elements identification is done by taking data from up to 75 μm from the surface. The results of the analysis with LIBS showed immersion for 10 days, the corrosion rate and hardness of mild steel increased with 30 days immersion. The increase in the corrosion rate of mild steel is indicated by decreasing the value of dissolved oxygen intensity, the electrochemical reaction is fast. The decrease in the corrosion rate is indicated by the increase in the intensity value of Zn and Al elements associated with the formation of a passive film on the metal surface as a protective layer to protect further corrosion attacks.

Detection of trace substances adhered to a metal surface by laser-induced breakdown spectroscopy

2017 ◽  
Vol 32 (3) ◽  
pp. 609-615 ◽  
Author(s):  
Yoshizo Kawaguchi ◽  
Hideki Ohmura ◽  
Tadatake Sato
Keyword(s):  
Aluminum Alloy ◽  
Metal Surface ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Laser-induced breakdown spectroscopy (LIBS) was applied to inspect trace substances on aluminum alloy surfaces.

Temporal Gating for the Optimization of Laser-Induced Breakdown Spectroscopy Detection and Analysis of Toxic Metals

2001 ◽  
Vol 55 (10) ◽  
pp. 1312-1319 ◽  
Author(s):  
Brian T. Fisher ◽  
Howard A. Johnsen ◽  
Steven G. Buckley ◽  
David W. Hahn
Keyword(s):  
Toxic Metals ◽  
Delay Time ◽  
Atomic Emission ◽  
Metal Species ◽  
Laser Induced Breakdown Spectroscopy ◽  
Experimental Conditions ◽  
Breakdown Spectroscopy ◽  
Select Group ◽  
Delay Times ◽  
Laser Induced Breakdown

Optimal temporal gating for laser-induced breakdown spectroscopy (LIBS) analysis was investigated for a select group of toxic metals, namely the Resource Conservation and Recovery Act (RCRA) metals arsenic, beryllium, cadmium, chromium, lead, and mercury. The differing rates of decay between the continuum plasma emission and the atomic emission were used as a means to maximize the signal-to-noise ratio of the atomic emission lines for these six metal species. Detection windows were investigated corresponding to delay times from 2 to 50 μs following the plasma-initiating laser pulse. For the current experimental conditions, it is concluded that the relatively short delay time of 12 μs is optimal for the detection of arsenic, beryllium, cadmium, and mercury, while a longer delay time of 50 μs is optimal for the detection of chromium and lead. The reduced atomic emission intensity at relatively long delay times is compensated for by the use of long detector gate widths. Estimated detection limits are reported for the six metal species based on the optimized temporal gating and ensemble averaging of multiple laser pulses, and the implications for simultaneous metals monitoring are discussed.

Laser-Induced Breakdown Spectroscopy Analysis of Lead Aerosol in Nitrogen and Air Atmosphere

2017 ◽  
Vol 72 (4) ◽  
pp. 584-590 ◽  
Author(s):  
Daniele A. Redoglio ◽  
Natascia Palazzo ◽  
Francesca Migliorini ◽  
Roberto Dondè ◽  
Silvana De Iuliis
Keyword(s):  
Laser Pulse ◽  
Delay Time ◽  
Plasma Temperature ◽  
Laser Induced Breakdown Spectroscopy ◽  
Experimental Conditions ◽  
Breakdown Spectroscopy ◽  
Air Atmosphere ◽  
Laser Induced Breakdown ◽  
Carrier Gases ◽  
Pb Concentration

In this work, laser-induced breakdown spectroscopy (LIBS) is applied for quantitative measurements of Pb in aerosols. In order to investigate the carrier gas role and, in particular, the effect of O2 addition to the gas itself, measurements are carried out in nitrogen and air atmosphere. Aerosol particles are produced by nebulizing Pb(CH3COO)2 * 3H2O aqueous solutions of known concentration and the atomic line of 405.8 nm is detected as Pb signature. The plasma generated with the laser pulse is characterized in terms of plasma temperature and electron density, showing no substantial differences with the two carrier gases used. The behavior of the LIBS signal as a function of the delay time with respect to the laser pulse is investigated changing the environmental conditions and, in particular, the Pb concentration values. The different trends registered in the case of relatively short (up to 20 μs) and long delay time, resulting to be the same whatever the Pb concentration value, could have a significant effect on the calibration curve performed in different experimental conditions.

scholarly journals Analysis of Pollution in High Voltage Insulators via Laser-Induced Breakdown Spectroscopy

Molecules ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 822 ◽  
Author(s):  
Xinwei Wang ◽  
Shan Lu ◽  
Tianzheng Wang ◽  
Xinran Qin ◽  
Xilin Wang ◽  
...  
Keyword(s):  
High Voltage ◽  
Delay Time ◽  
Energy Intensity ◽  
Laser Energy ◽  
Spectral Characteristics ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Pollution Detection ◽  
Deposit Density

Surface pollution deposition in a high voltage surface can reduce the surface flashover voltage, which is considered to be a serious accident in the transmission of electric power for the high conductivity of pollution in wet weather, such as rain or fog. Accordingly, a rapid and accurate online pollution detection method is of great importance for monitoring the safe status of transmission lines. Usually, to detect the equivalent salt deposit density (ESDD) and non-soluble deposit density (NSDD), the pollution should be collected when power cut off and bring back to lab, time-consuming, low accuracy and unable to meet the online detection. Laser-induced breakdown spectroscopy (LIBS) shows the highest potential for achieving online pollution detection, but its application in high voltage electrical engineering has only just begun to be examined. In this study, a LIBS method for quantitatively detecting the compositions of pollutions on the insulators was investigated, and the spectral characteristics of a natural pollution sample were examined. The energy spectra and LIBS analysis results were compared. LIBS was shown to detect pollution elements that were not detected by conventional energy spectroscopy and had an improved capacity to determine pollution composition. Furthermore, the effects of parameters, such as laser energy intensity and delay time, were investigated for artificial pollutions. Increasing the laser energy intensity and selecting a suitable delay time could enhance the precision and relative spectral intensities of the elements. Additionally, reducing the particle size and increasing the density achieved the same results.

Element Characterization of AlZnO by Laser Induced Breakdown Spectroscopy (LIBS)

2010 ◽  
Vol 34-35 ◽  
pp. 365-370 ◽  
Author(s):  
Dong Qing Yuan ◽  
Ming Zhou ◽  
Jian Ting Xu
Keyword(s):  
Pulse Energy ◽  
Delay Time ◽  
Signal Intensity ◽  
Element Concentration ◽  
Emission Spectra ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

We calculate the temperature of excited plasma, found that will be enhanced with pulse energy increased. The delay time and the pulse energy were very important to the LIBS signal and define the -0.5μs was very suitable to this experiment, determined the intensity of emission spectra was linear to the pulse energy when the delay time was fixed. By change the delay time, got the emission of bivalence ionization of Zn was just less than 500ns.At last, we had researched the effect of element concentration and the thickness of film on signal intensity. When the concentration of Al being increased from 2.5% to 5%, the intensity of signal enhanced double. At the same time the content of Zn being decreased from 78% to 76%, the intensity of signal had just no change.

Nanosecond laser-induced breakdown assisted by femtosecond laser pre-ionization in air: the effect on spatial resolution and continuous radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20701
Author(s):  
Bo Li ◽  
Xiaofeng Li ◽  
Zhifeng Zhu ◽  
Qiang Gao
Keyword(s):  
Femtosecond Laser ◽  
Spatial Resolution ◽  
Laser Induced Breakdown Spectroscopy ◽  
Nanosecond Laser ◽  
Breakdown Threshold ◽  
Powerful Technique ◽  
Breakdown Spectroscopy ◽  
Continuous Radiation ◽  
Laser Induced Breakdown

Laser-induced breakdown spectroscopy (LIBS) is a powerful technique for quantitative diagnostics of gases. The spatial resolution of LIBS, however, is limited by the volume of plasma. Here femtosecond-nanosecond dual-pulsed LIBS was demonstrated. Using this method, the breakdown threshold was reduced by 80%, and decay of continuous radiation was shortened. In addition, the volume of the plasma was shrunk by 85% and hence, the spatial resolution of LIBS was significantly improved.

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