Publication

Time-resolved imaging and spatially-resolved spectroscopy of Electrical Discharge Machining Plasmas

2007
Conference Papers

Abstract

Optical spectroscopy of the emission from a plasma created during electrical discharge machining (EDM) showed a strong Ha line coming from neutral hydrogen atoms and continuum radiation. An electron temperature of 0.7 eV and plasma density of 2.1018 cm(3) had been calculated. New spatially-resolved as well as temporal optical emission spectroscopy of the EDM plasmas showed that this density is slightly higher in the plasma center and decrease rapidly with time. The electron temperature remains roughly constant across the plasma. Analysis of the pre-breakdown duration shows that the breakdown mechanism in water may be different from the one in oil.

Official source

https://infoscience.epfl.ch/entities/publication/3eebf101-54d5-4681-8721-4b9723c44e17

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2007
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/3eebf101-54d5-4681-8721-4b9723c44e17

About this result

Related concepts (32)

Raman spectroscopy

Raman spectroscopy (ˈrɑːmən) (named after Indian physicist C. V. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules, although rotational and other low-frequency modes of systems may also be observed. Raman spectroscopy is commonly used in chemistry to provide a structural fingerprint by which molecules can be identified. Raman spectroscopy relies upon inelastic scattering of photons, known as Raman scattering.

Plasma (physics)

Plasma () is one of four fundamental states of matter, characterized by the presence of a significant portion of charged particles in any combination of ions or electrons. It is the most abundant form of ordinary matter in the universe, being mostly associated with stars, including the Sun. Extending to the rarefied intracluster medium and possibly to intergalactic regions, plasma can be artificially generated by heating a neutral gas or subjecting it to a strong electromagnetic field.

Electric discharge

In electromagnetism, an electric discharge is the release and transmission of electricity in an applied electric field through a medium such as a gas (ie., an outgoing flow of electric current through a non-metal medium). The properties and effects of electric discharges are useful over a wide range of magnitudes. Tiny pulses of current are used to detect ionizing radiation in a Geiger–Müller tube. A low steady current can be used to illustrate the spectrum of gases in a gas-filled tube.

Related publications (6)

Time-resolved imaging and spatially-resolved spectroscopy of Electrical Discharge Machining Plasmas

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