laser beam profiler

[SimasLTU]

Hello,

I am trying to develop the software to analize my laser beam. I have an image of it, I know the formulas, how to calculate all the parameters of laser beam, but I am new in image processing and analizing.

Does any body know, how to start that kind of project?

My problems:

1. How to detect the ellipse shaped beam in LabVIEW? (Center [x;y] coordinates of beam, the beam is like shown in attached photo)

2. How to draw coordinates system [x, y system] through center coordinates of the beam?

If someone does know the other ways, how to start Laser Beam Profiler project, please, feel free to share the information.

Thanks in advance.

Simas

[SimasLTU]

Any ideas?

[Cameron-T]

Using the IMAQ Find Circular Edge and the Coordinate System Manager VI's you could locate the beam, find the center, and create a cooridinate system on the center of the beam. These VI's are available in the Vision Development Module as well as many other image processing functions that could be useful for you. Learn more about it here.

[altenbach]

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SimasLTU wrote:

I have an image of it, I know the formulas, how to calculate all the parameters of laser beam, but I am new in image processing and analizing.

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What are the formulas and parameters? Surely doesn't look look like a simple model.

In any case, you can always get an array subset of the region of interest and do a 2D fit to the model. A simple example for a 2D gaussian with rotation is shown here. (Scroll down for the newest version)

[SimasLTU]

Cameron-T, I have NI Vision Development Module, but I don't know, how to use functions, that you mentioned. Maybe you could help me, or send me some simple example?

altenbach, my purpose of this project, is to measure M^2 of the beam.

[Cameron-T]

Use the Vision Assistant to help get started. It can be found by right clicking on the Block Diagram and going to Vision & Motion >> Vision Express >> Vision Assistant. You could also look through vision examples by going to Help >> Find Examples... When the example finder opens Browse to Toolkits and Modules >> Vision.

[SimasLTU]

I saw all these examples. But I don't know the main idea, how to do this kind of project. Could you help me with this project?

[Cameron-T]

I would really suggest using the Vision Assistant. It has a pretty intuitive User Interface. If you find the two functions that I already referenced in a previous post it walks through how to set them up. That is my best suggestion on getting started on your project.