An air-gap flash is a photographic light source capable of prod... - dofaq.co
air gap flash

An air-gap flash is a photographic light source capable of prod...

wikipedia - 06 Oct 2015
An air-gap flash is a photographic light source capable of producing sub-microsecond light flashes, allowing for (ultra) high-speed photography. This is achieved by a high-voltage (20 kV typically) electric discharge between two electrodes over the surface of a quartz (or glass) tube. The distance between the electrodes is such that a spontaneous discharge does not occur. To start the discharge a high-voltage pulse is applied on an electrode inside the quartz tube.

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