It's called trial and error.
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This is how the shutter works not when the electrical current is applied. How is the timing of the application of the current decided and how is it executed?
I read all this and more b4 asking.
As you’ve probably noticed, if one takes two pieces of polarized glass (such as the lenses from polarized sunglasses) and lays them atop one another at 90° angles, no light is able to pass through. This is because each one filters out light which is not polarized to its polarization axis, so the combination of the two lenses filters out 100% of the light. Edgerton ‘s rapatronic camera appears to have used this property in combination with a Kerr cell– a nifty and obscure optical element which rotates light’s plane of polarization when a high-voltage field is applied.
The rapatronic camera lens included two perpendicular polarizers, which prevented any light from entering… but sandwiched in between them was a Kerr cell. When the Kerr cell was energized, it affected all of the light which passed through the first polarizer by rotating its plane of polarization by 90°, realigning the light to match the second polarizer. This allowed the light to pass through both polarizers whenever the Kerr cell was provided with electricity, which is exactly what was done for 10 nanoseconds at the critical moment. This assembly provided an extremely fast non-mechanical shutter, exposing the film to the light for a minuscule fraction of time.
I suppose, if he had a patent on it, you could probably find the solution you’re seeking by going to the US Patent Offce web site.
It's called trial and error.
Click Here:http://simplethinking.com/home/rapatronic_photographs.htm
I’d think that an electronic circuit triggered by the detonation signal would delay the camera shutter firing to occur at a specific time after the bomb was detonated. With multiple cameras triggered at different delays, a time sequence of the explosion could be captured.