How to build a Raman detector?

  • #1
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Main Question or Discussion Point

if you filter completely the relaigh scattering, could a solar panel detect a raman signal?
 

Answers and Replies

  • #2
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If I were trying to make a Raman setup on the cheap and had plenty of time to scan a sample, I think I would wavelength disperse the beam and scan a photodiode across it. Using a photodiode has the advantage of detailed spec sheets and sample circuit diagrams many places on the internet.
 
  • #3
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so a solar panel won't work?
 
  • #4
TeethWhitener
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so a solar panel won't work?
A solar cell is a photodiode. A photodiode might not be the best detector though.

Most commercial Raman spectrometers use CCDs (charge coupled devices) for detection, and these are relatively cheap and abundantly available: they are widely used in digital cameras. They are also fast. If you disperse the scattered light with a diffraction grating, a CCD array can easily detect a decent fraction of the relevant spectrum simultaneously, as opposed to sweeping the diffracted light past a single photodiode.

In fact (...google google google...) Yep:
https://pubs.acs.org/doi/full/10.1021/ph400108p
I thought I remembered someone doing this already: they used their smartphone camera as a detector for a homemade Raman spectrometer.
 
  • #5
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i bought a diffraction grating from a website named home science tools, this is a picture of it

My Snapshot.jpg


any reason it won't work?
 
  • #6
TeethWhitener
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A diffraction grating is not a detector. It simply disperses the different wavelengths of light.
 
  • #7
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Here's a youtuber who built a DIY version of a Raman detector:


As you can see, there's more to it than what you think.
 
  • #8
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i mean will the diffraction grating separate the raman signal from relaigh scattering?
 
  • #9
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You didn't watch the video, did you?
 
  • #10
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i did watch the video. can a homemade raman spectrometer detect carbon nanotubes?
 
  • #11
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I don't think you did watch the video. If you did, you'd know that your solar panel plus diffraction grating is woefully inadequate for what you want to do.

You have a habit of ignoring responses to your messages and answers to your questions. That is not just wasteful and ineffective, but it makes people less likely to respond to you.
 
  • #12
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no, i mean is there any way to build a homemade raman spectroscope that detects carbon nanotubes other than use a solar panel and diffraction grating. it doesn't have to use a solar panel and diffraction grating. it can use any other components instead. it uses something other than a solar panel and diffraction grating instead. i don't think you understood that question.
 
  • #13
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Again, you show no signs of having watched that video. Do you have a HeNe laser? Do you have a notch filter? The only equipment you've mentioned is solar panels and diffraction gratings - now you say you won't use it, but you won't say what you will use. I think the only possible answer is "No, you won't be able to do this."
 
  • #14
jim mcnamara
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This thread seems to have gone into deadlock. Thanks everyone, but it is time to close this thread
 

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