Apologies for the appalling way in which I put my queries, and I'll answer in
one go here.
1) Particle size and beam strength: What I meant to say was...although the
other colour reflected/refracted? is grey and unseen with naked eye, if the
light beam is 'reflected' from the larger particles among the smaller
particles, could that be a misguided belief that there are a large number of
larger particles present in a given solution, when in actual fact there isn't?
Example: Lemon yellow solution {although this would apply to a clear solution
as well}...shine laser thru solution...strong beam of light suggesting larger
particles, BUT, could that beam strength also indicate light 'refracting?' off
those larger particles and as it scatters in the liquid 'reflect?' light off
the smaller ones, giving the illusion that there are *many* larger particles in
solution due to beam strength, when if fact there may be a *lesser* number of
larger particles but the beam strength indicates otherwise.
In a clear solution that beam would just appear stronger than perhaps it
otherwise would in a clear solution with minimal larger particles. Jeez, I
don't know if this is decipherable either?
I'll move on to the other one...
2) Laser failing to pass thru liquid: Shone light thru solution...puts spot on
wall as light exits glass but no path thru liquid. I believe both you and Dok
have answered this one now. Although you're right regarding spot 'size' on
wall, I've switched batteries over from laser with larger spot size {now
there's the appropriate larger spot size on wall with this laser} and there
appears to be little difference. If I look *real* close I can see a *very*
faint beam, but when batteries are returned to original laser that beam is
*very* evident. This suggests to me that there is a basic difference in
construction of both lasers {for the want of better description}.
I believe I understand the different apearance of a laser spot as compared to
an LED. An led couldn't really be defined as a 'spot', besides, they won't
light up the trees 15 streets away with a 'spot'.
If I still haven't made myself clear I guess we'll have to put it down to a
"failure to communicate" with the uneducated.
Your 'spot size on wall' indictor for the laser is very useful too Marshall,
Thanks very much for that. I knew there was a reason I don't participate in
other discussion groups anymore <g>.
N.
> Date: Thu, 15 Apr 2010 11:09:51 -0400
> From: [email protected]
> To: [email protected]
> Subject: Re: CS>Serious EIS Colour Size/Zeta=[Malvern DLS]
>
> You might be correct there, but I had assumed that the statement that it
> was throwing a good spot on the wall meant that it was lasing. If the
> spot is more than 1/4 inch in diameter at 10 feet, then it would not be
> a good spot on the wall as far as I am concerned. So, how big is the
> spot on the wall at 10 to 20 feet? Should be about the size of a
> pencil. If it is bigger then the laser is not lasing and is nothing
> more than an LED.
>
> Marshall
>
>
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