----- Original Message -----
From: Matthew McCann
To: Ode Coyote
Sent: Wednesday, December 08, 2004 10:09 AM
Subject: Re: CS>CS and "floaties"
Hi, Ode,
I didn't write much about the polarization of the light
scattered by the Tyndall Effect. It may just be a
curiousity. On the other hand, it may be a way to
break apart TE into a concentration factor and a
particle size factor.
If you view the TE with a polaroid film (e.g. polaroid
sunglasses) a vertical laser beam and a horizontal
laser beam may appear quite different, even though
they are generated by the same laser pointer.
This is what optical theory predicts. I haven't tried it
because I don't own any polaroid sunglasses.
Matthew
----- Original Message -----
From: Ode Coyote
To: Matthew McCann
Sent: Wednesday, December 08, 2004 6:14 AM
Subject: Re: CS>CS and "floaties"
I missed the polarized part.
Ode
At 10:31 AM 12/7/2004 -0500, you wrote:
>>>>
Right, lasers would not show iridescence. Detecting interference would have
to be by a measurement,
not an immediate perception by unaided eyes.
This might be a major R&D undertaking, though
still possibily within the means of some home
experimenters.
----- Original Message -----
From: <mailto:[email protected]>Ode Coyote
To: <mailto:[email protected]>Matthew McCann
Sent: Tuesday, December 07, 2004 10:12 AM
Subject: Re: CS>CS and "floaties"
Probably so, but irridescence by eye depends on broad spectrum light to
be split up into colors and lasers don't have it.
I doubt 'I' could see the pattern better with a laser. [Hey, I'll try it]
Magnifying glass maybe.
Two different colored lasers probably could do a bang up job so long as
my eyes aren't involved.
Ode
At 09:46 AM 12/7/2004 -0500, you wrote:
>>>>
Hi, Ode,
An 1/8 floatie can produce a very good reflection of
the beam of a laser pointer. Even if interference is
not noticeable to the naked eye (i.e. iridescence)
it may be measureable using a laser pointer at
various glancing angles. At glancing angles there
should be optical polarization effects too.
Incidentally, I think the Tyndall Effect scattering
of light produces polarized light too.
Matthew
----- Original Message -----
From: <mailto:[email protected]>Ode Coyote
To: <mailto:[email protected]>Matthew McCann
Sent: Tuesday, December 07, 2004 6:08 AM
Subject: Re: CS>CS and "floaties"
I don't think my eyes go that small..I don't recall seeing one on a
quarter inch oil slick either.
I'll start paying attention.
Ode
At 07:34 AM 12/6/2004 -0500, you wrote:
>>>>
If floaties are metallic silver monomolecular films on the
air-liquid interface, and if they exhibit interference fringes
(like oil slicks do), it may then be possible to measure the
average thickness of the particles. Two laser diode
wavelengths would give two independent ways of measuring
the layer thickness. Has anybody noticed interference
fringes on the floaties?
Matthew
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