Meeting started at 2:30 p.m. in Ngee Ann Poly

We decided to modify our laser projector set-up once and for all, due to the polarizations of the laser beam, thus a different design had to be conceptualized. A handle was added into the blueprint as well.

We were to design a plug to accommodate 4 other plugs and also to source for 2 beam expanders and a 500 mW green laser with the cheapest price and cheking the polarizing directions at the same time.

Meeting ended at 5:30 p.m.

Meeting started at 2:15 p.m. at Ngee Ann Polytechnic

Timeline is to be drafted for our project so as to have something as the basis to judge the progress of our project.

Various suggestions for design of projector : DMD is to be placed in 1 box, together with the 2 laser controllers if possible to make use of space.

Project is also to be divided into 2 portions : CGH portion and the Optics Portion

CGH portion : Developing the codes for a 2D CGH so as to be downloaded in SLM to produce an image. Labview software can be used to alter the image. A reference wave is added to the object wave from the object itself to form a hologram known as the CGH, requiring knowledge of the diffraction and interference theories. Source codes must also be improved on and the parameters must be changed so as to improve the quality of the image formed. Magnification can also be altered by shifting tbe position of the lenses to alter the image distance and object distance as well.

Optics portion L Ensuring optimization of the images formed and a beam expander, a combination of the objective and convex lens can be used to transmit the laser beam into 2 different beams. Laser power and lens equation decides the display area of the image, so to display one with a larger area, a higher powered laser could be made use of.

Meeting ended at 6:15 p.m.

Ngee Ann Polytechnic, 8:45 a.m.

Prepartions for the projector dismantling operation were ready, all the necessary devices have been prepared, such as screwdrivers etc. Cross cables are to be used to download the image to the projector using Labview software. The National Instruments Measurement and Automation Explorer software was used to create a link from Labview to the projector.

The CVS IP address is : 192.168.10.10 As such, the PC options must also be reconfigured to the same IP address to establish the link.

In order to change the image :

Use the right mouse click on CVS in MAX and select the file transfer option, images can then be uploaded into the projector using this option. However, all files in the remote directory must be deleted prior to the transfer itself. Next, going back to Labview, under Project Explorer, go to my real-time images/ applications. Then under building applications, selct build all, build again, then display and run as start.

Next, we dismantled all the components of a conventional light based projector. Here is how the original projector looked like with most of its components intact:



Here are the components after dismantling :

Laser Drivers :




Meeting ended at 1:30 p.m

Meeting started at 2:00 p.m. at Ngee Ann Polytechnic

More practice was to be placed on the Labview programme. Mr Lee told us that we are not just going to focus on labview, but also to dismantle a projector and take down the dimensions and lastly coming out with a diagram of our prototype if time permits.

Firstly, we practised Labview, starting with the design of a Shift Register circuit, which was highly successful, just on the first try. We also made use of the Elasped time function so that the program does not execute too quickly and is only executed in a set period of time. A pink wire attached to the elasped time symbol refers to a STRING. We also made use of While Loops and the Compare Function; once the output reaches a certain value, it will automatically reset to the original.

Next, we decided on how we should modify the projector to be used as the product of the experiments. Tasks :

1 ) Design blueprint of the prototype
2 ) List down all required appratus needed, with specifications if possible
3 ) Calculations for focal length etc. using the lens equation to ensure proper positioning of the lenses.


Our original design was to put everything in a rectangular box measuring 45 cm X 20 cm X 16 cm. However, we decided that this was far too original and uncreative and was too bulky as well, and soon rejected it. We left the designing stage to the next session.

This is an image produced by that of a conventional image projector :




Meeting ended at 5:20 p.m

Meeting started at 2:30 p.m Ngee Ann Polytechnic

Today, we were introduced to the basic concepts of Labview, at the same time being given a basic demonstration of one of the exercises before letting us try out the program.

At the start, we were very confused about how to use the program as we found it to be very complicated, like an advanced form of C ++ ... After more explanations by our mentor and spending some time familiarizing ourselves with the software, we finally managed to come out with our first diagram successfully.

Although there were some problems with our diagram, we gained a lot of valuable knowledge about the software although we were still rather complicated by it. We resolved to familiarize and understand the software by June.

We also agreed to incorporate a humidifier as our screen into our laser projector. This is to allow a 3D image to be projected, which is unable to be shown on a plane screen.

Meeting ended at 4:30 p.m.

About Yourself Here.

A group working on designing a small and portable laser based projector

Your Wishes Here =D

Our project to be of a successful and unexpected success !

Your Chat Box Here.

 

• January 2009
• February 2009
• March 2009
• April 2009
• May 2009
• June 2009
• July 2009
• August 2009