Are you happy with the consistency of the orientation of the sensor relative to the axis of the gun/barrel? And how do you feel that the tape does the job of securing the sensor to the gun? When we looked at this a couple of years back we made a rig where the sensor bolted to a clamp, and the clamp bolted to the barrel. There was very little potential for damping to creep into the results.
yes, i am happy with the alighnment and consistency. we could next time we test do the same gun again and see if the same thing comes out to prove it.
we didn't want to add any weight, nuts, bolts, and fittings all add mass to the system. we want something as unentrusive as possible.
Will there by vertical and horizontal ( left/right ) numbers taken to, or are you only measuring forward/backward motion?
Why no vertical measurement? I thought part of the idea of holding it was so you could get a complete measurement without restricting yourself to one dof... but you've limited it anyway by only measuring one direction.
Also, I'm curious... what would you say your angular error is in sensor alignment from marker to marker?
in terms of the "forward" kick - its real. and there is no way that the human response, no way the body can react that quickly.
The only thing a person has to react to is their own thought that they'll be firing a marker. As soon as they've made the decision to fire the marker, the body can begin to prepare/react to the shot. Until you've shown that doesn't have an effect by remote triggering, there's plenty of time for a reaction as the trigger is pulled. It is fishy that a couple integrals of the Ion and Protege 68/45 curves look like they might end up positive.
As for filtering your data, you might have a tough time with that because the frequency of the oscillations look like they're about the same as the sample rate of your hardware/software. The only reasonable suggestion I have is to average as many shots as you guys are willing to take. You could probably get rid of most of the electrical noise with a physical low pass filter between the sensor and adc, if you don't already have one in there.
Edit: Also remember, a full tank will weigh significantly more than an empty tank. Assuming the ideal gas law still holds pretty well at 4500 psi (questionable), you gain about 415 grams (.91 lbs) empty vs full for a 68ci tank at 60*f, assuming an average molecular mass of air of 28.97 g/mol.
In an effort to make a small scientific outreach, you can check me by going to www.wolframalpha.com and inputting the following:
101.325Pa*.00111432 m^3 *28.97 grams/mol/(Boltzmann's constant*288.70 K*6.022*10^23/mol)
3.1026*10^7Pa*.00111432 m^3 *28.97 grams/mol/(Boltzmann's constant*288.70 K*6.022*10^23/mol)
Pretty cool, eh? Actually, I'm curious how close that is. Could you guys measure it?
I'd probably run the tests at half a pod and half a tank, because you'll be closer to that at any given point in time during a game than completely full. Plus, you'll get more acceleration.
our tank had about 3700 psi.