LTI 20-20 UltraLyte 100 Calibration checks
Discussion
tapereel said:
the device calculates all speeds in the same way so a 0mph test confirms the accuracy for the full range of speeds. As it happens a 0mph target is the most difficult for the device to measure...but as your brain is hurting trying to understand how it works you either won't believe what I have written or won't understand it.
For other doubters the range is of no consequence to accuracy in the speed.
Whilst not an expert on speed guns, I have a massive amount of experience in electro-optical distance measurement equipment and its inherent faults/inaccuracies. I dispute your assertion. If you have evidence to back it up, please show it.For other doubters the range is of no consequence to accuracy in the speed.
Rovinghawk said:
Whilst not an expert on speed guns, I have a massive amount of experience in electro-optical distance measurement equipment and its inherent faults/inaccuracies. I dispute your assertion. If you have evidence to back it up, please show it.
The way I understand it is that the "speed gun" isn't really a "speed gun" at all - it's a distance measuring device. It works by measuring the distance to the vehicle twice a set time apart and uses that to calculate your speed. To calibrate it all you need to do is measure a series of stationary objects a known distance away and that's it, hence the reason why you don't need moving objects. For example, if you measure the distance to a vehicle, then repeat a second later and the distance has changed by 16.67m then you can easily calculate the speed to be 60km/h.
Rovinghawk said:
tapereel said:
the device calculates all speeds in the same way so a 0mph test confirms the accuracy for the full range of speeds. As it happens a 0mph target is the most difficult for the device to measure...but as your brain is hurting trying to understand how it works you either won't believe what I have written or won't understand it.
For other doubters the range is of no consequence to accuracy in the speed.
Whilst not an expert on speed guns, I have a massive amount of experience in electro-optical distance measurement equipment and its inherent faults/inaccuracies. I dispute your assertion. If you have evidence to back it up, please show it.For other doubters the range is of no consequence to accuracy in the speed.
I am not minded or motivated to educate you in speedmeter technology but I will point out that ignorance of something is not justification that it isn't possible, real or accurate.
As you are expert in optical distance measuring devices and its inherent issues then all you need to do is to overcome those issues and you will be able and expert in optical speedmeters. The problem you have is that you need to become more expert in the subject you profess to be expert in.
Good luck.
tapereel said:
Rovinghawk said:
tapereel said:
the device calculates all speeds in the same way so a 0mph test confirms the accuracy for the full range of speeds. As it happens a 0mph target is the most difficult for the device to measure...but as your brain is hurting trying to understand how it works you either won't believe what I have written or won't understand it.
For other doubters the range is of no consequence to accuracy in the speed.
Whilst not an expert on speed guns, I have a massive amount of experience in electro-optical distance measurement equipment and its inherent faults/inaccuracies. I dispute your assertion. If you have evidence to back it up, please show it.For other doubters the range is of no consequence to accuracy in the speed.
I am not minded or motivated to educate you in speedmeter technology but I will point out that ignorance of something is not justification that it isn't possible, real or accurate.
As you are expert in optical distance measuring devices and its inherent issues then all you need to do is to overcome those issues and you will be able and expert in optical speedmeters. The problem you have is that you need to become more expert in the subject you profess to be expert in.
Good luck.
Therefore Rovinghawk may well have a point.
Monty Python said:
The way I understand it is that the "speed gun" isn't really a "speed gun" at all - it's a distance measuring device. It works by measuring the distance to the vehicle twice a set time apart and uses that to calculate your speed. To calibrate it all you need to do is measure a series of stationary objects a known distance away and that's it, hence the reason why you don't need moving objects.
For example, if you measure the distance to a vehicle, then repeat a second later and the distance has changed by 16.67m then you can easily calculate the speed to be 60km/h.
MontyFor example, if you measure the distance to a vehicle, then repeat a second later and the distance has changed by 16.67m then you can easily calculate the speed to be 60km/h.
You should stick to comedy...OK you have.
The speedometer doesn't work like that.
The speed gun really is a speed gun, it measures and indicates distance only after the speed has been measured.
Perhaps it is more accurate to say "the speed gun isn't a distance gun, it's a speed gun that can also measure distance."
What fun.
REALIST123 said:
tapereel said:
Rovinghawk said:
tapereel said:
the device calculates all speeds in the same way so a 0mph test confirms the accuracy for the full range of speeds. As it happens a 0mph target is the most difficult for the device to measure...but as your brain is hurting trying to understand how it works you either won't believe what I have written or won't understand it.
For other doubters the range is of no consequence to accuracy in the speed.
Whilst not an expert on speed guns, I have a massive amount of experience in electro-optical distance measurement equipment and its inherent faults/inaccuracies. I dispute your assertion. If you have evidence to back it up, please show it.For other doubters the range is of no consequence to accuracy in the speed.
I am not minded or motivated to educate you in speedmeter technology but I will point out that ignorance of something is not justification that it isn't possible, real or accurate.
As you are expert in optical distance measuring devices and its inherent issues then all you need to do is to overcome those issues and you will be able and expert in optical speedmeters. The problem you have is that you need to become more expert in the subject you profess to be expert in.
Good luck.
Therefore Rovinghawk may well have a point.
tapereel said:
Well as you say, you are not an expert on speed guns. You do mention that you have expertise on a related subject but because you are not an expert in overcoming the inherent faults/inaccuracies in that technology you dispute a technology you admit to being inexpert in.
I am not minded or motivated to educate you in speedmeter technology but I will point out that ignorance of something is not justification that it isn't possible, real or accurate.
As you are expert in optical distance measuring devices and its inherent issues then all you need to do is to overcome those issues and you will be able and expert in optical speedmeters. The problem you have is that you need to become more expert in the subject you profess to be expert in.
Good luck.
Unfortunately for you a speedmeter as you put it is A: a distance measuring device to start with, B: it then from those distance & time, then does a few calculations/guesstimates & makes a number up = C. I am not minded or motivated to educate you in speedmeter technology but I will point out that ignorance of something is not justification that it isn't possible, real or accurate.
As you are expert in optical distance measuring devices and its inherent issues then all you need to do is to overcome those issues and you will be able and expert in optical speedmeters. The problem you have is that you need to become more expert in the subject you profess to be expert in.
Good luck.
If you are familiar with part A's foibles in many different fields its not hard to work out multiplying A's foibles x B does not always = C accurately every time !
If you would like a demonstration I'd be happy to oblige
tapereel said:
Well as you say, you are not an expert on speed guns. You do mention that you have expertise on a related subject but because you are not an expert in overcoming the inherent faults/inaccuracies in that technology you dispute a technology you admit to being inexpert in.
I am not minded or motivated to educate you in speedmeter technology but I will point out that ignorance of something is not justification that it isn't possible, real or accurate.
As you are expert in optical distance measuring devices and its inherent issues then all you need to do is to overcome those issues and you will be able and expert in optical speedmeters. The problem you have is that you need to become more expert in the subject you profess to be expert in.
Good luck.
You typed all of that, when you could just have typed something useful, informative and perhaps, even, persuasive.I am not minded or motivated to educate you in speedmeter technology but I will point out that ignorance of something is not justification that it isn't possible, real or accurate.
As you are expert in optical distance measuring devices and its inherent issues then all you need to do is to overcome those issues and you will be able and expert in optical speedmeters. The problem you have is that you need to become more expert in the subject you profess to be expert in.
Good luck.
0/10 for content. 11/10 for supercilious point scoring.
Rovinghawk said:
I've seen some almighty boo-boos with distance measuring devices. They are a long way from infallible.
So what has that got to do with a speed gun that doesn't work the same as a distance meter?As I said above, your acknowledged expertise in distance meters has nothing to do with optical speedmeters.
cptsideways said:
tapereel said:
Well as you say, you are not an expert on speed guns. You do mention that you have expertise on a related subject but because you are not an expert in overcoming the inherent faults/inaccuracies in that technology you dispute a technology you admit to being inexpert in.
I am not minded or motivated to educate you in speedmeter technology but I will point out that ignorance of something is not justification that it isn't possible, real or accurate.
As you are expert in optical distance measuring devices and its inherent issues then all you need to do is to overcome those issues and you will be able and expert in optical speedmeters. The problem you have is that you need to become more expert in the subject you profess to be expert in.
Good luck.
Unfortunately for you a speedmeter as you put it is A: a distance measuring device to start with, B: it then from those distance & time, then does a few calculations/guesstimates & makes a number up = C. I am not minded or motivated to educate you in speedmeter technology but I will point out that ignorance of something is not justification that it isn't possible, real or accurate.
As you are expert in optical distance measuring devices and its inherent issues then all you need to do is to overcome those issues and you will be able and expert in optical speedmeters. The problem you have is that you need to become more expert in the subject you profess to be expert in.
Good luck.
If you are familiar with part A's foibles in many different fields its not hard to work out multiplying A's foibles x B does not always = C accurately every time !
If you would like a demonstration I'd be happy to oblige
Rovinghawk said:
I've seen some almighty boo-boos with distance measuring devices. They are a long way from infallible.
You're quite correct - anything that measures distance by light can be affected by all manner of issues caused by reflection, refraction, absorption, scattering and a bunch of other processes. However, in the case of speed guns, all that's needed is evidence that they work to the required level of accuracy required by the laws of the country in which they're used. If the manufacturer can demonstrate that they work reliably (and also that it is clear when they're not), then that's all that's required.
Next thing we know they'll be using drones....
EskimoArapaho said:
You typed all of that, when you could just have typed something useful, informative and perhaps, even, persuasive.
0/10 for content. 11/10 for supercilious point scoring.
But it points out clearly that the chap is barking up the wrong tree.0/10 for content. 11/10 for supercilious point scoring.
It is not clever saying something can't work because something you understand has problems.
The way these devices work has been published for decades. If someone is "expert" in distance meters they can easily find out how speedometers work. I am surprised they don't.
Monty Python said:
Rovinghawk said:
I've seen some almighty boo-boos with distance measuring devices. They are a long way from infallible.
You're quite correct - anything that measures distance by light can be affected by all manner of issues caused by reflection, refraction, absorption, scattering and a bunch of other processes. However, in the case of speed guns, all that's needed is evidence that they work to the required level of accuracy required by the laws of the country in which they're used. If the manufacturer can demonstrate that they work reliably (and also that it is clear when they're not), then that's all that's required.
Next thing we know they'll be using drones....
JustinP1 said:
tapereel - are you suggesting that the laser speed gun measures *speed* only, and extrapolates distance from that?
I would suggest that it measures distances, and calculates a speed from those distance measurements.
No I'm not.I would suggest that it measures distances, and calculates a speed from those distance measurements.
You can suggest what you like but it doesn't have to be accurate or complete.
tapereel said:
REALIST123 said:
tapereel said:
Rovinghawk said:
tapereel said:
the device calculates all speeds in the same way so a 0mph test confirms the accuracy for the full range of speeds. As it happens a 0mph target is the most difficult for the device to measure...but as your brain is hurting trying to understand how it works you either won't believe what I have written or won't understand it.
For other doubters the range is of no consequence to accuracy in the speed.
Whilst not an expert on speed guns, I have a massive amount of experience in electro-optical distance measurement equipment and its inherent faults/inaccuracies. I dispute your assertion. If you have evidence to back it up, please show it.For other doubters the range is of no consequence to accuracy in the speed.
I am not minded or motivated to educate you in speedmeter technology but I will point out that ignorance of something is not justification that it isn't possible, real or accurate.
As you are expert in optical distance measuring devices and its inherent issues then all you need to do is to overcome those issues and you will be able and expert in optical speedmeters. The problem you have is that you need to become more expert in the subject you profess to be expert in.
Good luck.
Therefore Rovinghawk may well have a point.
tapereel said:
But it points out clearly that the chap is barking up the wrong tree.
It is not clever saying something can't work because something you understand has problems.
The way these devices work has been published for decades. If someone is "expert" in distance meters they can easily find out how speedometers work. I am surprised they don't.
I'm beginning to suspect that the reason you won't explain your point is that you can't explain your point.It is not clever saying something can't work because something you understand has problems.
The way these devices work has been published for decades. If someone is "expert" in distance meters they can easily find out how speedometers work. I am surprised they don't.
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