Karakteristik Fisik Plasma dalam Laser-Induced Breakdown Spectroscopy (LIBS) Menggunakan Laser Neodymium:Yttrium-Aluminum-Garnet (Nd-YAG) Pada Sampel Daging Kerang Sungai

2018 ◽  
Vol 2 (1) ◽  
pp. 9-14
Author(s):  
Nasrullah Idris, Tjoet Nia Usmawanda, Herman, Kurnia Lahna, Muliadi Ramli
Keyword(s):  
Thermal Equilibrium ◽  
Local Thermal Equilibrium ◽  
Laser Induced Breakdown Spectroscopy ◽  
Plasma Laser ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Abstrak – Teknik LIBS akan dipakai untuk analisis sampel daging kerang sungai karena diperkirakan kerang sungai dapat memberi petunjuk mengenai polusi logam berat akibat limbah penambangan emas tradisional. Namun, karakteristik-karakteristik plasma LIBS yaitu suhu, densitas elektron dan derajat ionisasi, ditentukan oleh berbagai parameter termasuk jenis sampel. Daging kerang termasuk sampel yang rumit karena banyak mengandung air dan secara umum mengandung elemen-elemen organik utama sama (C, H, O, dan N). Studi ini dilakukan untuk mengestimasi suhu dan densitas elektron plasma yang dibangkitkan pada sampel daging kerang sungai. Perangkat LIBS utama yang digunakan dalam studi ini adalah sebuah laser Nd-YAG dan sebuah detektor optik kanal banyak. Sampel kerang sungai diambil dari Sungai Panga, Kabupaten Aceh Jaya, Aceh, Indonesia yang berhulu di pegunungan Gunong Ujeun, salah satu lokasi penambangan emas tradisional di Aceh Jaya. Estimasi suhu dan densitas elektron plasma dilakukan dengan plot Boltzmann menggunakan garis-garis emisi spektral besi, Fe. Ditemukan bahwa suhu plasma dan densitas elektron plasma cenderung berfluktuasi, namun demikian secara umum suhu dan densitas elektron plasma relatif lebih rendah dibandingkan suhu dan densitas plasma yang dibangkitkan dari sampel padat lainnya. Suhu dan densitas elektron plasma tersebut memenuhi kriteria Maxwell dan kriteria Mcwhriter untuk plasma laser berada dalam kondisi kesetimbangan termal lokal (local thermal equilibrium, LTE).Kata kunci: teknik sepektroskopi plasma laser, suhu plasma, densitas elektron plasma, daging kerang, laser Nd-YAG

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.

Characterization of Amethysts from Sukamara, Central Kalimantan, Using Laser-Induced Breakdown Spectroscopy (LIBS)

2020 ◽  
Vol 1 (2) ◽  
pp. 5-8
Author(s):  
Komang Gde Suastika, Heri Suyanto, Gunarjo, Sadiana, Darmaji
Keyword(s):  
Emission Intensity ◽  
Laser Energy ◽  
Emission Spectra ◽  
Atomic Emission ◽  
Laser Induced Breakdown Spectroscopy ◽  
Chemical Formula ◽  
Central Kalimantan ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Abstract - Laser-Induced Breakdown Spectroscopy (LIBS) is one method of atomic emission spectroscopy using laser ablation as an energy source. This method is used to characterize the type of amethysts that originally come from Sukamara, Central Kalimantan. The result of amethyst characterization can be used as a reference for claiming the natural wealth of the amethyst. The amethyst samples are directly taken from the amethyst mining field in the District Gem Amethyst and consist of four color variations: white, black, yellow, and purple. These samples were analyzed by LIBS, using laser energy of 120 mJ, delay time detection of 2 μs and accumulation of 3, with and without cleaning. The purpose of this study is to determine emission spectra characteristics, contained elements, and physical characteristics of each amethyst sample. The spectra show that the amethyst samples contain some elements such as Al, Ca, K, Fe, Gd, Ba, Si, Be, H, O, N, Cl and Pu with various emission intensities. The value of emission intensity corresponds to concentration of element in the sample. Hence, the characteristics of the amethysts are based on their concentration value. The element with the highest concentration in all samples is Si, which is related to the chemical formula of SiO2. The element with the lowest concentration in all samples is Ca that is found in black and yellow amethysts. The emission intensity of Fe element can distinguish between white, purple, and yellow amethyst. If Fe emission intensity is very low, it indicates yellow sample. Thus, we may conclude that LIBS is a method that can be used to characterize the amethyst samples.Key words: amethyst, impurity, laser-induced, breakdown spectroscopy, characteristic, gemstones

Research progress on portable laser-induced breakdown spectroscopy

2020 ◽  
Vol 13 (6) ◽  
pp. 1-18
Author(s):  
ZENG Qing-dong ◽  
◽  
YUAN Meng-tian ◽  
ZHU Zhi-heng ◽  
CHEN Guang-hui ◽  
...  
Keyword(s):  
Research Progress ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown
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