At Make. Interesting. Wonder how well the concept actually works... I doubt its good enough for court, should you happen to live in a country where the speed of a projectile somehow matters. (...501 f/s is much more deadly than 499 f/s, eh?)
I'm certainly no expert, but it seems to me that this design would not work or at least not work well with firearms. In fact, in the article he seemed to be using it for some sort of marble slinger.
The blast from the firing would interfere greatly with a microphone based system. You would not get such a clean sound pattern if there's a blast and miniature sonic boom along with the impact of the bullet on the papers.
I don't know what the sampling rate is on the PC recording, but I'm guessing at some of the higher velocities you'd run into issues with that.
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