Off Topic: The Flood
This topic has moved here: Subject: I would really appreciate your help.
  • Subject: I would really appreciate your help.
Subject: I would really appreciate your help.
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I am doing a report on 'An explanation of how radars are used for speed detection.' I am doing a 3 minute presentation and I am currently in grade 10. I'd appreciate if anyone could help me find any information on it. I also would like to know what would be the best program to make an animation showing a radar gun (from a cop car) transmitting a beam and the beam reflecting back off a speeding car. I have Photoshop and MS Powerpoint. Thanks!

-Mark V

[Edited on 1/2/2005 7:31:16 AM]

  • 01.02.2005 6:52 AM PDT
Subject: Help me!
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Heres a couple I found.

http://www.swedetrack.com/obstact.htm << Obstical detection
http://www.ee.eng.buffalo.edu/faculty/cartwright/teaching/ee4 94s99/pres entations/lasar.pdf <<< PDF

[Edited on 1/2/2005 7:04:06 AM]

  • 01.02.2005 7:03 AM PDT
Subject: Anyone care to help me?..please?
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Thank you so much!! makes my work a lot easier!! The second link won't work.

[Edited on 1/2/2005 7:08:17 AM]

  • 01.02.2005 7:04 AM PDT
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I live to help. Not serve but help. :)

  • 01.02.2005 7:06 AM PDT
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I only need help. I do not wish to enslave anyone:)

That's wierd, it only says I got 1 reply from KayJay.

[Edited on 1/2/2005 7:12:40 AM]

  • 01.02.2005 7:08 AM PDT
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Anything else? I'm bored.

  • 01.02.2005 7:12 AM PDT

A few signals are emitted, one after another. Each signal bounces off the car. Each signal is received. The time between each signal being received is measured and the speed is determined.

Stationary speed cameras operate over a fixed distance and measure the time between the car entering the field of view and the car leaving the fixed distance area.

  • 01.02.2005 7:18 AM PDT
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Thankyou all! I really appreciate your help! :)

[Edited on 1/2/2005 7:19:49 AM]

  • 01.02.2005 7:18 AM PDT
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Whats with changing the subject?

  • 01.02.2005 7:34 AM PDT
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Posted by: KayJay
Whats with changing the subject?


Need more help. That's why.

Thankyou all- KayJay, goweb, Reocn, thanks! :D



[Edited on 1/2/2005 7:54:19 AM]

  • 01.02.2005 7:43 AM PDT

The linear velocity. The angular velocity is only present when something isn't moving in a straight line.

  • 01.02.2005 7:43 AM PDT
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Posted by: Recon Number 54
Some radars (and lasers) work using the principle of the Doppler effect. EMR (radar and light) have a constant speed, they are however effected by the speed of other objects.

Just like a police siren (or a horn) will change pitch as a car approaches and then recedes from an observer, EMR encounters the same "pitch" (frequency) change. By measuring the amount that the frequency has changed, a angular velocity can be calculated.


The same principal can be used to calculate how far away stars are from the earth, because stars that are further away are moving faster from the earth, therefore the electromagnetic radiation emmitted from them is "stretched" causing the electromagnetic radiation to appear as though it is of a lower wavelength than it actually is, hence "Red Shift".

Sorry, I've gone off topic....

  • 01.02.2005 7:53 AM PDT
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Also, what would be a good program to show an animation of a radar gun transmitting a wave and the wave reflecting off at a different frequency? Can I do it in MS Powerpoint?

  • 01.02.2005 7:54 AM PDT

._____Metal
/..}-/-{..\
I.X....X.I..... Jets: Check
.T_V_T......Chargers: Check
...****........Colts: -blam!- them....

Hehe...hehe...this isn't gunna' help but...Radar Guns reduce sperm count...yeah, that's immature but I don't care!

  • 01.02.2005 8:48 AM PDT
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Just answer my last post please.

  • 01.02.2005 9:01 AM PDT