Research Journal
Tuesday, March 25,2008.
Hi! Everyone. I am a freshman that are in WSE187 now. This is going to be
my journal of the research project that i will be working on.(I don't
really know what it is going to be yet.)
March 30, 2008
I have been thinking about my project ideas. I have many things in mind,
but they turn out to be either too simple or too difficult to do. I will
list them here.
1. the lens that they use in the peep hole of the door
I took off the equipment from my dorm door tonight and I found that
it can not be opened without destroying it with tools. Then, I did some
research on it. From the internet, I figured it works as a telescope. I
know how a telescope works. Now, I need to find the relationship between
those two things that I don't see any relationship between.
I believe there is one concave and one convex mirror in this small
equipment. I found a picture online for it and here is it's
website
And the principle of it is explained in that website in Chinese...
April 1st, 2008
Here is some stuff i found from a website:
The peephole can see up to about 120 degrees from indoor, and nothing can
be seen form out door. The picture I have above shows the princeple. L1 is
a convex mirror which has a really small focal lenth, it makes images A'
and B'. L2 is a concave mirror which is used to enlarge the image A",
B". A" and B" is the image that people see from inside. There is a picture
shown in the website above of what are people going to see from outside.
April 11th, 2008
Yesterday I saw this poster of changeing image in the lab. It shows
different pictures when you look at it in different directions. I
remembered that I used to play with these kind of paper since I was really
young. I found that the surface of this special paper is not flat, it was
made of plastic with tiny semi-cylinders that were arranged
horizontally. With the knowledge about lenses that I know today, I hope I
can figure out how does those paper work. Prof Noe told me those paper
were called lenticular image. We can use the software of lenses to see how
the paper work.
April 24th, 2008
I did an experienment with the paper on the 14th, I set up the camera in a
fixed position and turn the paper to make it have different angles with
the camera. After several shots I found that within 180 degress, each of
the two image will appear twice.
When I use a microscope to observe the surface of the paper, I saw what I
have expected to see-little dorms of plastic. So this paper is made of
micro lenses.It interesting how the patern that is being printed in the
back does not look the same as what I have expected as lines. They appear
as tiny verticle lines. When I look at them again from the back without
the microscope they actually look like lines as I have expected it to
be. So I guess it's a printing problem. Everything will be clear if we can
get another sample of this from this company online.
April 25th, 2008
Dr. Noe gave an interesting link that explain how microlenses work. It is
this company that makes this kind of paper.
Microlens
If I can get a sample from this company, or get this software that it
provides to print out the paterns. It would be really helpful to
understand why were their verticle stripes instead of horizontal as what I
have expected.
I found something interesting relates to the micro lens today, it is about
3D images created with 2D pictures. This kind of pictures are called the
stereoscopy. I have seen it in the Museum of Moving Images. Here is a link
from wikipedia that explains how it works. Stereoscopic
Image
Then when I start to search about lenticular sheets, I found out about the
lenticular printing skill. Here is a link that explains it. Lenticular
Printing It explains how that the image is printed on the back of the
plastic lenticular sheet. The lenses on the lenticular sheet would line up
with the image interlace so that the light reflected off each strip is
refracted in a slightly different direction, but the light from all strips
of a given image are sent in the same direction(which means the rays are
parallel).
Another great link on stereostopy which explains how the light travels in
the sheet. Lenticular
Here are some really interesting pictures that explains the concept.
http://www.depthography.com/times.html
http://www.3dmeibang.com/eng/html/produce.html
http://www.3dweb.org.uk/technology_autostereoscopic_displays_philips.html
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