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U SEC. TIME
Fig. 2. Luminosity-time curves for argon flashlamps.
Symbol
Thickness of argon
layer at front of
lamp, cm
0.5 1.0 2.0
fuse which entered the charge through the stem of the funnel. The air in the lamp was flushed out with argon admitted through a tube at the rear of the lamp.
Microsecond Photographs
Figure IB shows a picture of the argon flashlamp about 0.5 /xsec after the maximum intensity of the flash. It may be observed that the luminosity is slightly more intense, and perhaps near the maximum, around the circumference of the face, that is, in the narrow outer region slightly removed from the im
mediate frontal effect of the explosive. (The front of the lamp had an inside diameter about 0.5 in. greater than that of the explosive charge.) Also evident in the picture is what appears to be a small hole at the center and front of the charge where a 0.5-cm spacer was located. (This spacer was made of cork rather than gelatin.) No light is evident lateral to the direction of propagation of the detonation at the instant of this photograph.
Figures 1C and ID are pictures of the lamp taken about 3 and 7 /xsec, respectively, after the highly actinic flash from the front. In the approximate exposure time of 1 ptsec, the hot explosive gases are not sufficiently actinic to appear luminous; and accordingly, the gas cloud pouring out of the front appears black. As the explosion gas spreads out laterally, it obscures the lateral actinic flash in the
Winning and Edgerton: Explosive Argon Flashlamp
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