Hello, Time-Nutters--
A real-world precision timing need:
As a dedicated long-range rifle shooter and
ballistics enthusiast, I am in the early stages
of a project I am getting started on...
The object is to measure the velocity of a
rifle bullet both at the muzzle and downrange
Hello,
Long ago I was involved in a project that has something to do with test
cannons. They used a doppler radar (a commercially available equipment,
but I don't remember the manufacturer) for measuring the speed of the
bullet (a rather big one... if I was right, it was a 155mm caliper :) )
While in the shower:
You have the advantage that most of the
equipment will be more or less in line,
and you will have line of sight.
What if, at each station, you let your
microcontroller generate a 10kHz carrier
modulated by a 5kHz PN code, through an IR
led, and through a plastic lens (children
I'd think you don't even need the pn code. Check out any of the wireless
modules for sending analog video on 2.4ghz.. Cobble together an antenna with
gain.
Calibrate the delay throughout the hardware at 50 yd or so using hardline
compare, and extrapolate to longer ranges.
On Oct 31, 2010,
On 10/31/2010 01:56 PM, Michael Baker wrote:
Hello, Time-Nutters--
A real-world precision timing need:
As a dedicated long-range rifle shooter and
ballistics enthusiast, I am in the early stages
of a project I am getting started on...
The object is to measure the velocity
XBEE PRO XSC + PIC can do datalink this for about 75$ / observation point,
if you don't require high throughput
Xtof.
Finding a suitable data-link is much more an issue than the time-scale
and time-stamping issues, which could be done with sufficient
precision for not too much money and eff
Hi
Been down this road before.
The issue turns out to be the optics in the sky screens. You can only get "just
so good" without fancy optics. The normal photo detector behind a slit with the
sky as the light source is far from optimum. If you are going to put money into
the system, the optics
On Oct 31, 2010, at 8:06 AM, Bob Camp wrote:
> Adequate protection starts at about 1" of steel plate if it's angled to the
> incoming projectiles.
Using hardened armor plate (as used for steel "gong" targets) can get that down
under a half inch, resulting in a lot less mass to drag downrange
Hi Mike:
Are you looking into the Pejsa Ballistics computations?
http://www.prc68.com/I/FNFAL.shtml#Bal
Have Fun,
Brooke Clarke
http://www.PRC68.com
Michael Baker wrote:
Hello, Time-Nutters--
A real-world precision timing need:
As a dedicated long-range rifle shooter and
ball
Hi
The gotcha is that the gong can move / twist when hit. The plate buried in
front of the electronics has to just sit there and take it. More energy
transfer to the anchored plate.
I'm sure there are alloys that will get you under 1", the issue will be making
sure you have the right one...
On Oct 31, 2010, at 7:21 PM, Bob Camp wrote:
> The gotcha is that the gong can move / twist when hit. The plate buried in
> front of the electronics has to just sit there and take it. More energy
> transfer to the anchored plate.
>
> I'm sure there are alloys that will get you under 1", the i
Hi
The original request was to measure both velocity down range and time of
flight. They certainly are related, however the relation (especially around the
speed of sound) is difficult to estimate. If you are dealing with a projectile
that drops sub-sonic as it goes down range, velocity is inde
Reply-To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] A real-world precision timing need
Hi
The original request was to measure both velocity down range and time of
flight. They certainly are related, however the relation (especially around the
l.com
Date: Mon, 1 Nov 2010 11:57:43
To: Discussion of precise time and frequency measurement
Reply-To: scmcgr...@gmail.com
Subject: Re: [time-nuts] A real-world precision timing need
Why not purchase one of the existing ballistic chronographs and upgrade the
time base?
Sent from my Ve
BlackBerry
-Original Message-
From: scmcgr...@gmail.com
Date: Mon, 1 Nov 2010 11:57:43
To: Discussion of precise time and frequency measurement
Reply-To: scmcgr...@gmail.com
Subject: Re: [time-nuts] A real-world precision timing need
Why not purchase one of the existing ballistic chronogr
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