I only have few-minutes, to type here...so making this a real 'quicky' post.
Laser Diodes have a minimum LASING threshold-current...and with weak
batteries...you do-not have enough-current to avalanche in LASER mode!
Unless you reach minimum-current...the LD will glow-red, not as LASER.
Rather than waiting for (new) battery...just swap-batteries to Test others?
Also Nevile...Marshall, was describing Photospectrometry, not-refraction
and while you have a very inquisitive-mind...when-off-track, bad-answers?
Infact/see-below...learn how to use WIKI/understand PhotoSpectrometry.
Dok Dallas
P.S. Earlier-posting was accidentally-sent before complete (without) Links
and as soon as I can post-again, will POST WIKI-LINKS to get ya going~
Try these-two Search engine's www.dogpile.com & http://en.wikipedia.org
(Have hundreds of KEY/WIKI-LINKS...to keep-you-going for many-years?)
START~> http://en.wikipedia.org/wiki/Colloidal_particle
http://en.wikipedia.org/wiki/Category:Colloidal_chemistry
http://en.wikipedia.org/wiki/Rayleigh_scattering
Biggest problem...getting good [Scientific] Info...is in-search [wording]..?
No-reason, to put-yourself-down, just because lacking a 'degree'...one of
IDIOTS I worked with...had Several, yet-failed (creative) Logical Thinkng!
Come to think of it...HE DID very well...when DECANTING his Wine.<g>
(LoL I'm Sorry ...that must have been the "Ghost-of-Ol' Wayne"...typing)
This ONE, will put you at HEAD-of-the-Class, Dogpile [MALVERN DLS].
Chance to show Marshall & Ode how to Size & Zeta 0.6nm Particles~!
FYI: View EXCELLENT on-line Educational Seminars, once Registered,
strongly suggest...NOT asking-questions here...University Professors..!
Better start-here> http://en.wikipedia.org/wiki/Dynamic_light_scattering
(MALVERN is world-leader in patented/state-of-art DLS measurements)
Neville, rather than get into endless-loop of answering Daily Questions,
which take way-too-much TIME from Marshall, or Dok...so~Try LINKS!
Prefer to Show member HOW & WHERE-to-SEARCH...not Answering
I have even included full physics-package from college...you can study.
>From time-to-time can post you KEY-WORDS...to point you, to INFO?
http://www.chem1.com/acad/webtext/elchem/ec1.html
http://www.chem1.com/acad/webtext/elchem/ec2.html
http://www.chem1.com/acad/webtext/elchem/ec3.html
http://www.chem1.com/acad/webtext/elchem/ec4.html
http://www.chem1.com/acad/webtext/elchem/ec5.html
http://www.chem1.com/acad/webtext/elchem/ec6.html
http://www.chem1.com/acad/webtext/elchem/ec7.html
http://www.chem1.com/acad/webtext/elchem/ec8.html
==================================================
--- On Thu, 4/15/10, Neville Munn <[email protected]> wrote:
From: Neville Munn <[email protected]>
Subject: RE: CS>Serious EIS Colour Questions.
To: [email protected]
Date: Thursday, April 15, 2010, 12:49 AM
I think I may have found the answer. I believe the batteries need to be *REAL*
good for the laser to be powerful enough to pass thru a liquid. Although
the laser throws a good spot on the wall it's not powerful enough to pass thru
the solution. The other one which shows lesser beam may be indicative of
batteries in THAT laser starting to go as well.
Will get more batteries and re-check and see how things pan out then. I would
not have thought that a laser beam must have minimum power whereby it then
fails to show thru a glass of liquid though, even though it spots well on the
wall.
N.
> Date: Wed, 14 Apr 2010 12:19:16 -0400
> From: [email protected]
> To: [email protected]
> Subject: Re: CS>Serious EIS Colour Questions.
>
> Neville Munn wrote:
> > Marshall, would it be possible for you to give me an explanation
> > of why number (3) showed *no* beam thru the solution at all?
> > And for that matter, why there is a difference in strength of beam in
> > the other two?
> > All lasers were used on the same solution.
> >
> > Three different red lasers,
> > > (1) 650nm+/-10 maximum output 1mW.......{strong beam passing thru
> > liquid}
> > > (2) 650nm+/-10 maximum output 5mW.......{fainter beam}
> > > (3) 630-650nm maximum output 1mW.......{no beam at all}
> >
> > N.
> >
> > ------------------------------------------------------------------------
> > Australia's #1 job site If It Exists, You'll Find it on SEEK
> > <http://clk.atdmt.com/NMN/go/157639755/direct/01/>
> I have no idea. IT is working, right? Do they all look to be the same
> color red? Maybe you have the wavelength wrong on the 3rd one.
>
> Marshall
>
>
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