LabRadar Data Analysis

[Hinnerk]

For you LabRadar users, what apps do you use to analyze the chronograph data?

I just purchased one of these and tried it out this past weekend with some 22LR. I noticed that you really need to look at the individual tracks to verify that the V0 was calculated "correctly". Attached is a plot of the tracks (velocity vs. distance) in one series of 10 rounds of GECO ammunition. In the track shown with the green dots, there were a couple of spurious readings before the chronograph began tracking reliably and so the V0 looks improperly low (V0 is not read by the instrument but is an extrapolation).

The paper target was supposedly at 50 yards but it looks from the plot that it was more like 48 yards. The LabRadar keeps tracking the projectiles behind the target but the signal to noise ratio falls quickly by that point.

[DDRH]

interesting, i just took the data for what it is. Looking back, my tracked data is spot on, just rounded off. my V1 is set @ 10m, and the LR starts tracking around ~11.6m

it may be a bit tough for it to read the smaller 22lr. Are you using the microphone? although i think that will only help with triggering the radar.

i'm just learning how to plot with excel

[Hinnerk]

DDRH,
Excel is not a very good plotting application. I used SigmaPlot to produce the above and use some other scientific graphing program on Linux.

Yes, I used the external microphone to trigger the LabRadar. It didn't want to trigger with the internal microphone.

Most of the V0 results look "correct" but I would like to know what kind of algorithm they use. Obviously, data from behind the target should be excluded and maybe there should be some weighting based on the signal to noise ratio. In any case, it seems wise to double check the actual track data.

This data is just from my first use. Hopefully, higher caliber projectiles will produce more precise data.