Re: Can any one explain this?


"Doug Huffman" <doug.huffman@xxxxxxxxxxxx> wrote in message
news:8024ef5b-eec9-496b-b68d-669375396e06@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx


Larry Snyder wrote:
"Uncle Al" <UncleAl0@xxxxxxxxxxxxx> wrote in message
news:477ABBB4.D730614F@xxxxxxxxxxxxxxxx
Larry Snyder wrote:

I took a some pictures of a laser pointer spot on some paper with a
cheapie
usb camera from about 2 ft. Pictured is several pictures combined
together.
The difference is I adjust the focus closer with each picture. At
about
one
inch a pattern cleared up that shouldn't be there. There are no
vectors
available. It moved with the camera like moving a slide under a
microscope.
Anybody got an idea what this is?
http://www.pacificsites.com/~snyder/Example.jpg

Google Images
"Laser speckle" 692 hits


--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2
Looked at google stuff. Doesn't explain focal point. An interference
pattern
should be nearly random. Thanks for your input.
Larry
CCD pixels random or ordered? Beating Moire like with the speckles.
CCD are obviously ordered. Moire has vector distribution already. Nearly
point source doesn't have the vectors to create the observed pattern.
Interference cannot generate new vectors. I'm still confused. Thanks for
input.
Larry


.

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