Re: linear position sensor

From: Mauri (17285invalid_at_mynewsgate.net)
Date: 03/29/05 

Date: Tue, 29 Mar 2005 20:39:24 GMT

Hi, Chris. With TOF i mean a method measuring the round trip from the
reflection of a pulsed laser beam. Nevertheless, as light travels about
30.5 cm per ns, i think the desired resolution requires estraordinarily
precise timing. Thanks for the advice you gave me, i'm going to follow it.

bye
Mauri

Chris <cfoley1064@yahoo.com> ha scritto:

>
> Mauri wrote:
> > Hi all,
> > i need an application note describing a schematic for a linear
> position
> > sensor, in "time of flight" mode. The range of sensing is from 1 mt
> to
> > 1 cm, and the resolution less than 1 cm
> >
> > thanks
>
> Hi, Mauri. You haven't provided enough information to give an answer.
> I'm assuming "1 mt" means 1 m, or 1 meter. Apart from that, several
> questions remain.
>
> * What do you mean by "time of flight mode"? Are you talking about
> time to travel a fixed distance?
>
> * Do you need continuous position measurement, or is measurement at
> the beginning and end of the measured distance sufficient? It's much
> easier to measure time from crossing a sensor at the beginning of a
> distance to the end of the distance, and then produce meters per second
> or something like that.
>
> * "Linear position sensor" implies a number of things, including
> linear servo pots, LVDTs, and many other things. If you have a
> specific sensor in mind, you should specify it.
>
> * How fast is your object travelling? It's a lot easier to measure
> the speed of a tortoise than a bullet.
>
> This subject has been covered many times in both s.e.d. and s.e.b., and
> it might be more profitable for you just to use Google to find answers
> on these newsgroups to similar questions, rather than wait for
> responses.
>
> Good luck
> Chris

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