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




Nina Han
February 2008
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