Triple-Probe measurement of the short duration arc plasma generated by melting down the thin wire fuse element under the atmospheric pressure has been carried out. The time depending electron temperature as well as the electron density of the plasma were successfully obtained by carefully reducing the noises into the probe circuit using an optical isolation amplifier. Experimental results show that:
(1)The electron temperature shows about 30000 [K] immediately after generation of the arc plasma and decreases to approximately 10000[K] after 1.5 [ms] of the discharge. This value of 10000[K] was the same irrespective of the values of initially applied voltages and currents for melting the fuse element.
(2)The electron density shows about 1016 [cm-3] immediately after the generation of the arc plasma and also decreases to approximately a constant value of 1015 [cm-3] after 1 [ms] of the discharge. The radius of the arc plasma column first expands to about5 [mm] at beginning of the discharge and then shrinks to about 3 [mm] before disappearing. All data are presented and discussed.
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