Prolaser Laser Gun - Anybody want to play with one
Discussion
As a few of you know I have a Prolaser laser speed gun, one of a very few privately owned ones in the UK. Anyway I was thinking of selling it as I no longer have the time to play with it 
& thought this would be a good place to ask if anybody was interested.
I get several requests a year to appear or assist with tv programmes with it, its great fun for taking to the races you can zap away to your hearts content. Works a treat & I have plenty of fun with it.
PM me if anyone thinks they might be interested
PS: Sorry Ted if this is classed as a blatant sales plug but I'd thought I'd ask here as I can't think of anywhere else where there might be someone interested in it.
& thought this would be a good place to ask if anybody was interested. I get several requests a year to appear or assist with tv programmes with it, its great fun for taking to the races you can zap away to your hearts content. Works a treat & I have plenty of fun with it.
PM me if anyone thinks they might be interested
PS: Sorry Ted if this is classed as a blatant sales plug but I'd thought I'd ask here as I can't think of anywhere else where there might be someone interested in it.
Dwight VanDriver said:
...and it comes natuarally cptsideways with certificates that it has the same Home Office approval/specification as the ones used by UKBib (not USbib)and up to date Manufacturers calibrations certs etc ?
dvd
Calibrated not that long ago, and if you believe the twaddle then its completely different in all respects to that tested & approved by our oh so honourable home office, who somehow missed the most blaringly obvious mistakes in their testing procedures.
Its ex "CHiPs" yes really
probably used by the man himself 
are you in yorkshire DVD?
was having a bit of a play last night - child with a new toy syndrome,
I was appalled to clock a speed of 57MPH in a residential area - 30MPH limit.
However the object I clocked was in fact a house!
no kidding.
Silver cars are also interesting. 7MPH from parked cars.
The idea that you can simply go 'ping' and get a speed now seems absurd. The speed could be anything!. Seems best to leave the trigger pulled and follow a car for a good few seconds and believe the 'mode' average - ie, the speed it settles on for the longest time.
scary that people can loose livelyhoods because of these things.
was having a bit of a play last night - child with a new toy syndrome,
I was appalled to clock a speed of 57MPH in a residential area - 30MPH limit.
However the object I clocked was in fact a house!
no kidding.
Silver cars are also interesting. 7MPH from parked cars.
The idea that you can simply go 'ping' and get a speed now seems absurd. The speed could be anything!. Seems best to leave the trigger pulled and follow a car for a good few seconds and believe the 'mode' average - ie, the speed it settles on for the longest time.
scary that people can loose livelyhoods because of these things.
Also pointing at cars with the standard issue reflective backed roadsigns in the background gives off strange results too. No doubt Bryan will give us some results
Certainly worth considering just how scarily bad these device CAN be even in the right hands. I for one will never accept the evidence from one having previously owned this very device.
Try it trypod mounted off of shiny refelctive cars 1900ft was my record!
I'm waiting to hear of the new device that allegedly identifies the laser gun & returns a signal that linked to a GPS database
that the laser gun picks up, apparently on its way to our shores soon. At what point do these devices become defunct?
Certainly worth considering just how scarily bad these device CAN be even in the right hands. I for one will never accept the evidence from one having previously owned this very device.
Try it trypod mounted off of shiny refelctive cars 1900ft was my record!
I'm waiting to hear of the new device that allegedly identifies the laser gun & returns a signal that linked to a GPS database
that the laser gun picks up, apparently on its way to our shores soon. At what point do these devices become defunct?it'd make you very easy to track!
what is worrying however is that the 'capture' effect (bigger more reflective surface behind you - such as a box van) may also be a feature of laser guns, and not confined only to radar. e.g. a long sweeping length of reflective crash barrier may give a far stronger signal (even through the glass of the car) than the license plate, so the gun measures the speed of the sweep and not the speed of the car.
And that could be anything at all!
I often wondered about this when I saw the famous motorbike video on pepipoo. Suddenly he was at 100+ and the crosshairs weren't even near the bike at the time.
Other interesing things about the gun........
the self calibration tests its 2 timers (time of flight timers for ranging) against each other to make sure they correlate.
You test the allignment using either a road sign, or better a corner cube mirror with a non reflective background (such as a field) You can then check the lock tone as you sweep across this from left to right, and up and down.
Finally, get a tape measure out, measure the distance to the corner cube and see if the range reading corresponds.
what is worrying however is that the 'capture' effect (bigger more reflective surface behind you - such as a box van) may also be a feature of laser guns, and not confined only to radar. e.g. a long sweeping length of reflective crash barrier may give a far stronger signal (even through the glass of the car) than the license plate, so the gun measures the speed of the sweep and not the speed of the car.
And that could be anything at all!
I often wondered about this when I saw the famous motorbike video on pepipoo. Suddenly he was at 100+ and the crosshairs weren't even near the bike at the time.
Other interesing things about the gun........
the self calibration tests its 2 timers (time of flight timers for ranging) against each other to make sure they correlate.
You test the allignment using either a road sign, or better a corner cube mirror with a non reflective background (such as a field) You can then check the lock tone as you sweep across this from left to right, and up and down.
Finally, get a tape measure out, measure the distance to the corner cube and see if the range reading corresponds.
I’m green with envy 
bryan35 said:Fair enough. The chance of both timers being in error and by exactly the same amount will be small - enough to considered 0
the self calibration tests its 2 timers (time of flight timers for ranging) against each other to make sure they correlate.
bryan35 said:The latter method makes sense. The operator must set that up correctly to ensure no parallax error can occur. The former is more uncertain as the operator won’t know the contribution of the pole holding the sign (unless the right angle pan is also done)
You test the allignment using either a road sign, or better a corner cube mirror with a non reflective background (such as a field) You can then check the lock tone as you sweep across this from left to right, and up and down.
bryan35 said:I wonder how many operators actually do this! I wouldn’t trust any speed measurement if the measured distance wasn’t correct.
Finally, get a tape measure out, measure the distance to the corner cube and see if the range reading corresponds.
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