抄録
The total time-lag τ necessary for building up strong continuous spectral emission after a flash tube is triggered consists of the time-lag τi in the discharge current and the delay-time τl in the light emission after the discharge is started, that is, τ=τi+τl. Both the values of τi and τl increase with increase of the gas pressure p and the electrode distance d, and decrease with the increase of the voltage V applied to the main electrodes.
In this study, the value of τi and its fluctuation have been determined by varying the triggering intensity for flash tubes filled with various rare gases. It is made clear that τi tends to approach a certain definite value characterized by p, d, V and the nature of gas and that the fluctuations become smaller with the increase of the triggering intensity. When a flash tube is used as the light source in high-speed photography, it is pointed out that the triggering intensity should be chosen correctly according to the discharge conditions such as p, d, V and the nature of gas.
The experimental results of τi have been analyzed qualitatively on the assumption that the discharge in a flash tube may be looked upon as a simple Townsend discharge.
