Subject:
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RE: IR scanner
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 30 Nov 1999 14:59:00 GMT
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Original-From:
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Jim Thomas <Jim.Thomas@trw^antispam^.com>
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Viewed:
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755 times
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Like Pete said, this won't work. When people use lasers (or sonar) to
measure distance, they reflect the signal back to the source and use phase
shift to make the measurement. The proposed scheme would have to compare
arrival times between the sensors located around the room. One sensor would
be unable to determine anything regardless of the processing speed. If you
did that then you would have to worry about the propagation time of the
electrical signals, etc. Do it with sound waves (ultrasonic) with the three
sensors wired to one processor -- that would be workable.
JT
> -----Original Message-----
> From: Pete Hardie [mailto:pete.hardie@dvsg.sciatl.com]
> Sent: Tuesday, November 30, 1999 5:45 AM
> To: lego-robotics@crynwr.com
> Subject: Re: IR scanner
>
>
> Christian Jacobsen wrote:
> > What if you built a rotating laser or infrared transmitter • on top of your
> > robot? Three sensors located at specific locations around • a maze (for
> > instance) could register the time delay between laser (or infrared)
> > "pulses".
> >
> > The longer the delay, the farther away the robot is from • the sensor. And
> > the converse.
>
> I may be underestimating the capabilities of current Lego
> sensors, but I believe
> that the time difference of (light across 1 foot) and (light
> across 10 feet)
> would be too small to register without some seriously fast processing.
>
> [ BTOE check...
>
> 186000 mi/s * 5280 feet/mi = 96,720,000 ft/s ==> 1.0339e-08 s/ft
> means we're talking about hundredths or thousandths of microseconds
> here.....]
>
>
> --
> Pete Hardie | Goalie, DVSG Dart Team
> Scientific Atlanta |
> Digital Video Services Group |
>
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