To design effective shielding for spacecraft and to evaluate the risk
posed by debris and meteoroids, we must be able to perform tests in
the laboratory. Hypervelocity Impact testing has some extreme requirements.
How do we launch projectiles at speeds more than seven times faster
than the fastest bullet? How do we know how fast the projectile was
traveling at impact? How can we get pictures of an impact event that
lasts only a few microseconds - that's millionths of a second?
Launching projectiles at velocities high enough to simulate orbital
debris impacts requires some remarkable equipment called "two stage
light gas guns." The technology that makes these guns work is in
itself fascinating. Here's how it works.
We can measure the velocity of the impacting projectile in a hypervelocity
impact test using several different techniques. And there are other tools
we use to ensure a quality test.
To get images of hypervelocity impact events, we use cameras that are capable of taking up to 2.5 million frames
per second. You'd think that would take a lot of film, but these are no ordinary cameras.
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