Publication

Optical emission spectroscopy of electrical discharge machining plasma

Christoph Hollenstein, Antoine Descoeudres
2004
Journal Articles

Abstract

Plasma created during EDM is systematically investigated with optical emission spectroscopy. Typical spectra show a strong H,,, and continuum radiation, with many lines emitted by impurities coming from electrode and workpiece materials. The dielectric molecules are cracked by the discharge. Time-resolved spectroscopy shows that the electron density is extreme at the beginning of the discharge. This causes merging of lines, strong Stark broadening and shift of the H,, line. The electron temperature is low and remains roughly constant around 0.7 eV The low temperature, the high density and other spectroscopic evidences prove that the EDM plasma is non-ideal. (C) 2004 Elsevier B.V. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/9f3e1f41-9a07-4e26-8552-89fd3194594b

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Christoph Hollenstein, Antoine Descoeudres
2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/9f3e1f41-9a07-4e26-8552-89fd3194594b

About this result

Related concepts (32)

Emission spectrum

The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an electron making a transition from a high energy state to a lower energy state. The photon energy of the emitted photon is equal to the energy difference between the two states. There are many possible electron transitions for each atom, and each transition has a specific energy difference. This collection of different transitions, leading to different radiated wavelengths, make up an emission spectrum.

Corona discharge

A corona discharge is an electrical discharge caused by the ionization of a fluid such as air surrounding a conductor carrying a high voltage. It represents a local region where the air (or other fluid) has undergone electrical breakdown and become conductive, allowing charge to continuously leak off the conductor into the air. A corona discharge occurs at locations where the strength of the electric field (potential gradient) around a conductor exceeds the dielectric strength of the air.

Infrared spectroscopy

Infrared spectroscopy (IR spectroscopy or vibrational spectroscopy) is the measurement of the interaction of infrared radiation with matter by absorption, emission, or reflection. It is used to study and identify chemical substances or functional groups in solid, liquid, or gaseous forms. It can be used to characterize new materials or identify and verify known and unknown samples. The method or technique of infrared spectroscopy is conducted with an instrument called an infrared spectrometer (or spectrophotometer) which produces an infrared spectrum.

Related publications (32)

Optical emission spectroscopy of electrical discharge machining plasma

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