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Projectile
Detection
Projectile speed capturing first starts
with detection. Here are
some of these methods.* Electrical contact - projectile contacts wire within the barrel. * Contact switch - projectile contacts the lever of an outboard switch. * Optical - projectile interrupts the optical beem between a transmitter and receiver. * Inductive - projectile passes through a coil and produces an induced voltage. The next step in speed capturing is timing. |
Velocity Capture
Distance:
The second trigger pulse from the
dectectors stops the timer's
count. Now all is need is to divide measured distance by measured
time. V =
distance /
time
(meters / second)After detection is established, the issue of timing must be addressed. Velocity is measured by dividing distance over time. Distance is derived from the space between detectors. I use this distance because it is constant, unlike the varying lengths of different projectiles. Timing: Velocity capturing is completed by a timing mechanism. The timer starts counting on the first trigger pulse from the detectors. PIC Code: cg-rs232.asm shorts.inc PCB image ACG Chronograph image Schematics: velo-a velo-b velo-layout Timing diagram: benefits of dual detection The next step is data calculations Next ~~> Data Analysis Projectile Detection <~~Back |
Data
Analysis
After
velocity is
established, kinetic energies are calculated with the
proprietary program Coilgun Acquisition. The program receives the
captured timing from the Microcontroller. This measurement is
combined with the distance between the sensors according to user
input.
Results show measured speed in meter/sec and feet/sec, projectile kinetic energy, and efficiency between capacitor potential and projectile kinetic energy. User may select velocities in km/hour and miles/hour as well. I am now distributing ACG Acquisition as freeware and producing PIC timer boards, presently Velo5. End Velocity Capture <~~ Back |
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