jimmy101 wrote:jhalek90: How did you launch the bouncy ball? Mach 1 is pretty unlikely, even anything over 1000 FPS is pretty unlikely without a very serious cannon.
The second time domain is the time from gate to gate. Usually the sound card won't have any problems with this time (and frequency) domain but the accuracy of the chrony is limited by the number of data points between the two gates.
With a 1 foot gate separation it'll take 1 millisecond from gate to gate. That's only 1 KHz and a 44 KHz sample rate would give OK accuracy.
EDIT: the ball was lunched with my piston cannon, at 90-100 PSI
The cannon will be posted latter today!!!! woot.
The Reason im not sure if i hit mach1 is that there was 3-5 samples each time the ball passed a gate.... and only a few more in between the gates....
So, i am reaching the limits of this chrony...THAT is why i said i need more tests.... i refuse to claim that i hit mach1 for sure.... until i can test it more.
The results from my chrony indicate that the ball was traveling at 1200FPS, but i cant be sure that the ball missed the second gate... and that the second "peak" was just interference when you are dealing with a single thousandth of a second.... i wish i had a more acurate instrument... lol
this chrony is GREAT for slower speed or bigger projectiles. but i believe that with a bouncy ball... anything above 1000 FPS must be taken with a grain of salt.