How to plot the intensity of a diffraction pattern through a circular aperture

I'm new to LabVIEW and I was advised to run a tutorial exercise writen for other University students to familiarise myself with the program. Unfortunately, I've fallen at the final hurdle and I have no idea what I'm doing wrong
The task is to calculate and display the far-field diffraction pattern of a circular aperture, which is essentially the same as the 2D Fourier transform of a sine wave
I have a diffraction pattern on my intensity graph but it's not circular, and I've tried various things to make it circular but to no avial. I think my problem is that I'm not properly converting the aperture size to a circular shape, does anyone have any idea how I could do this?
Incase it helps, here is the link to the tutorial I've been using:
http://www.physics.gla.ac.uk/Optics/Miles/
The tutorial can be found listed under "Teaching Material" on the right hand side, and is simply called "LabVIEW". Clicking the link opens the PDF with the tutorial in it, and my problem begins on Pg 58. I'm also unsure of how to impliment the suggestions found on Pg 59
Thanks in advance
Ben

Hi Ben,
There is a running joke on these forums "Don't let Ben do math." so you are going to have to remind about some of that optics stuff I have not looked in quite a while.
Below you will find my mods of your code which were mostly just clean-up and simplifying. The big thing I did was re-size your graphs such that their aspect ratios were square. The pattern looks like something I recognize so I am not sure what is wrong. So please explain what you don't think is right and I'll see if I can be of any furterh assistance.
Just trying to help,
Ben
Message Edited by Ben on 06-05-2008 07:47 AM
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction
Attachments:
Diffract.PNG ‏79 KB

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How to plot the intensity of a diffraction pattern through a circular aperture

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