Just did 2 experiment:
1) Use 2 pairs of IR diode at exit site
easier to catch the exit signal , especially for faster BB > 500fps
2) Use shorter travel ~10cm
Accuracy / consistency of velocity can be kept within 2-3% deviation. Shorter tube results in easier to record the exit signal. The compromise is the time interval becomes shorter and needs more careful selection of the interval.
Audacity is set at 100k Hz sample rate with 16/24 bit (do not use floating as the signal will be lost during higher magnification of time)
Mic gain in Audacity needs to be set at ~90%
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