A transient pulsed arc was studied with narrow band 696.5 nm filters. The arc energy distribution was considered by a ratio: a certain region energy (intensity × region area)/sum. The results indicated a large intensity region appeared with a pulsed arc, which were considered as high-energy regions. They increased while the low-energy regions were compressed. The distribution ratio was changed by the ‘waves rush’ pattern with a large current or pulsed arc. Spurious energy concentration was found at the bottom of the arc. The pulsed arc with 10 kHz at 100 A had optimal characteristics in geometry and energy distribution. The essence of the pulsed arc was considered as constricting energy regions and creating high-energy density. ‘Onion-Kasuga’ algorithm was proposed to reconstruct the arc intensity.
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