Laser induced graphite plasma kinetic spectroscopy under different ambient pressures

Faridah, Nurul; Salwanie, Nur; Rizvi, S Z H; Chaudary, Kashif Tufail; Aziz, M. S.; Ali, Jalil

doi:10.1063/1.4978825

Cited by 2 publications

References 14 publications

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Laser Induced Plasma: Fundamentals and Characterization

Chaudhary,

Haider,

Roslan

2024

Laser-Based Techniques for Nanomaterials

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Laser-induced plasma (LIP) can be distinguished from other plasmas such as discharge plasma, inductively coupled plasma (ICP), etc. due to its violent expansion into the ambient atmosphere. LIPs are generated as a result of radiation absorption by the target material in solid, liquid, gaseous, or aerosol state, of a high-power laser pulse. The physical and chemical characteristics of the LIP depend on the experimental and ambient conditions, including the laser parameters (spot size, pulse width, wavelength, irradiance, etc.), the nature and state of the target material, and the surrounding environment. LIP is generally analysed by optical emission spectroscopy using high-resolution spectroscopy systems. A typical LIP emission spectrum includes a large number of closely spaced emission lines carrying vital information about the target material. LIPs, as a spectroscopic source experience a fast temporal evolution of their characteristic parameters, from ablation of material to the formation of plasma during absorption of the laser pulse. Apart from the spectroscopic techniques, diverse electrical devices are also used to study the kinetics of LIPs, such as the localized space potential, electron temperature, and density. LIPs have been used for various technological applications in several fields, such as defence, forensics, space exploration, public health, the environment, and more.

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Laser Induced Plasma: Fundamentals and Characterization

Chaudhary,

Haider,

Roslan

2024

Laser-Based Techniques for Nanomaterials

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Laser-induced plasma imaging for low-pressure detection

et al. 2018

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A novel technique based on laser induced plasma imaging is proposed to measure residual pressure in sealed containers with transparent walls, e.g. high voltage vacuum interrupter in this paper. The images of plasma plumes induced on a copper target at pressure of ambient air between 10Pa and 10Pa were acquired at delay times of 200ns, 400ns, 600ns and 800ns. All the plasma images at specific pressures and delay times showed a good repeatability. It was found that ambient gas pressure significantly affects plasma shape, plasma integral intensities and expansion dynamics. A subsection characteristic method was proposed to extract pressure values from plasma images. The method employed three metrics for identification of high, intermediate and low pressures: the distance between the target and plume center, the integral intensity of the plume, and the lateral size of the plume, correspondingly. The accuracy of the method was estimated to be within 15% of nominal values in the entire pressure range between 10Pa and 10Pa. The pressure values can be easily extracted from plasma images in the whole pressure range, thus making laser induced plasma imaging a promising technique for gauge-free pressure detection.

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Laser induced graphite plasma kinetic spectroscopy under different ambient pressures

Cited by 2 publications

References 14 publications

Laser Induced Plasma: Fundamentals and Characterization

Laser Induced Plasma: Fundamentals and Characterization

Laser-induced plasma imaging for low-pressure detection

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