🚀 go-pugleaf

In article <1dc71cINNa48@iskut.ucs.ubc.ca> arnett@unixg.ubc.ca (Bill Arnett) writes:
>In article <schuck.720989040@sfu.ca> Bruce_Schuck@sfu.ca writes:
>>Some very interesting emissions research is being done in Colorado.
>>The professor who has done this research has also come up with a
>>gadget that can be set up on the road side to measure emissions of
>>cars going by. It uses a TV camera to record license plate #'s and is
>>relatively cheap. It is not as accurate as the Air Care type stations,
>>but that isn't important because the 2 out of 10 cars pollute much
>>more than the other 8.
>
>This sounds ludicrious to me.  How the heck is this device going to
>measure emissions quickly enough to photograph the offender?   It takes
>time for gases to travel to the sensor!  In my case the tail-pipe is
>on the left side of the car so the gases would have to travel 8 feet
>before they reached the sensor.  The car is going to be travel a *long*
>way before the gases reach the sensor.
>
>Besides this, wind direction, wind speed, and air turbulence would all
>have to factored in in order to decide which car produced the emissions
>and how dispersed the gases were by the time they got to the sensor.
>A certain error factor were be tolerable since an additional test would
>be performed, but I can't beleive that this could do much better than
>50% accuracy.

I don't think it is measured the way you think it is.  If I'm not
mistaken, it uses some form of light to measure pollutants.
Based on the reflected light, it can then determine whether the
car is polluting or not.  This is probably much like how a radar
camera works.

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John Jay Tanlimco | University of British Columbia  | #$%!#^^&*(()_+|&^$$##!@
johnt@ee.ubc.ca   | Dept. of Electrical Engineering | @#$%^&*()!@#$%^&*()_=!@
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