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'[PICLIST] Laers again'
2001\02\02@054143 by Andy Faulkner

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Does anyone know how to measure distance with a laser
other than:

Pointing the laser at a target
detecting the reflected beam
Start a clock
Pulse the beam
Time the delay for the pulse to reach the detector.
Do some calculations on the result

Is this how its done if so does'nt the counter have to
be realy realy fast.

or is it done another way

=====

Andy Faulkner spam_OUTandyf97TakeThisOuTspamyahoo.com
Pyrosync International http://www.pyrosync.co.uk

Tel +44 778 896  6087.....................UK Dial 0778 896 6087

Fax +44 870 132 3275.....................UK Dial 0870 132 3275
http://www.event-supplies.co.uk http://www.spectacular-fireworks.co.uk


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2001\02\02@064137 by mike

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On Fri, 2 Feb 2001 02:41:01 -0800, you wrote:

>Does anyone know how to measure distance with a laser
>other than:
>
>Pointing the laser at a target
>detecting the reflected beam
>Start a clock
>Pulse the beam
>Time the delay for the pulse to reach the detector.
>Do some calculations on the result
>
>Is this how its done if so does'nt the counter have to
>be realy realy fast.
>
>or is it done another way
As the times involved are somewhat short, an alternative to using a
very fast clock to time the delay is to use an analogue method, e.g.
using the received signal to gate the charging of a capacitor, giving
a voltage proportional to the delay.
There is another method that can be used for measuring shorter
distances - fire the laser at an angle, and use a lens & linear CCD to
determine the distance by looking at the linear position of the spot.
This method is used for ride-height sensing in motor racing.
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