Question: Question: How to I convert the spectrum from the webcam to a spectral power density graph.

cjtiaan is asking a question about spectrometry: Follow this topic

cjtiaan asked on March 14, 2016 19:14
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What I want to do or know

I am a final year electrical engineering student with a project on characterizing an LED light. I need to build a spectrometer, and use the data in another application.

I would like to know how to convert the image from the camera to the wavelength vs power graph.

Background story



5 Comments

Define power. what are some possible units of power in this case?

Chris

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@cfastie thank you for your respons.

I want to determine the Luminous flux of the light.

Which means I want to measure the intensity in lumens of each wavelength.

Capture22.JPG

This image is basically what I want to display in my program.

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So you already have the result you want, but you have to write another program to do the same thing? I can't help with that, I'm not a programmer.

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Hi, cjtiaan - if you're looking for the absolute brightness, you may need to do a gain correction, which you can read about here: https://publiclab.org/notes/stoft/03-06-2015/plab-3-gain-correction

Hope that helps!

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cjtiaan,

Were you able to download the raw data from SpectralWorkbench? There are links for that on each spectrum page.

Chris

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