[sdiy] Theremin

[Roman]

proffesional laser distance meters used by construction workers measure
from 30cm up to 30m with 1mm resolution, or was it 1cm, can't remember.
I played with it in shop. Big device as for handheld unit, and kinda
expensive.
This 30cm short limit is determined mostly by the instrument size -
measurement
counts from its back end, so it's possible to measure about 10cm of light
travel
with something that is made in thousands and sold to civilians.

Roman

----- Original Message -----
From: "Scott Gravenhorst" <music.maker at gte.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, July 06, 2004 3:09 PM
Subject: Re: [sdiy] Theremin


> Reflected brightness is measured.
>
> I think the round trip time is a bit quick for simple analog circuits or
> even digital to measure.
>
> "Paul Maddox" <P.Maddox at signal.qinetiq.com> wrote:
> >Richard,
> >
> >> 'Scuse my dimness, but do you measure distance by calculating reflected
> >> trip time, or reflected brightness?
> >
> >good question!
> >
> >> Yeah, but you don't get that cool 50s retro antenna look. ;-)
> >
> >50's?
> >Man, you're to far ahead, try the 20's....
> >
> >Paul
> >
>
> ---------------------------------------------------------
> - Where merit is not rewarded, excellence fades.
> - Hydrogen is pointless without solar.
> - What good are laws that only lawyers understand?
> - The media's credibility should always be questioned.
> - The only good terrorist is a dead terrorist.
> - Governments do nothing well, save collect taxes.
>
> -- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
> -- Linux Rex         | RedWebMail by RedStarWare
> -- FatMan: home1.gte.net/res0658s/FatMan/
> -- NonFatMan: home1.gte.net/res0658s/electronics/
> -- Autodidactic Master of Arcane and Hidden Knowledge.
>