Question: Diffraction grating (200nm - 400nm) & Light, Vendor/Source Identification

darkdimension is asking a question about general
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by darkdimension | June 03, 2018 02:15 | #16424

Piecing together a DIY spectrometer and sourcing: diffraction grating (200nm - 400nm) and the appropriate light source. The target wavelengths are roughly: 220nm, 230nm, 250nm, 270nm and 280nm

I have located the recommended software to perform remote analysis (

This spectrometer would be used inline with a batch and possible continuous process.

Are there any vendors/sources for the proper diffraction grating?

What light source is recommended (Vendor/Source)?

The DIY equipment will display the wavelength that is absorbed as a black band. Is there a better way to approach this?

Thank you all for your help


The typical light sources used for commercial UV spectrophotometers are deuterium lamps. These light sources easily cover 190 nm to 400 nm. They usually also take a high voltage power supply to go with them and are expensive.

Sorry, but can't help you with a vendor off the top.

@Ag8n Thank you for that bit of information. Those are spendy little lamps.

I will see what I can get to work.

Again, thank you for you helping me.

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Anything to help. Those wavelengths are common in HPLC work. Before the new instruments, for uv/vis detectors, they would take a mercury lamp and use appropriate filters for the wavelength needed. Don't know if this approach is still viable or not. The mercury lamps were much cheaper.

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You can get gratings from places like Thor Labs or Edmond Optics. For a uv lamp, I would look at Thor labs or spectrometer vendors like Ocean Optics, BWTek, StellarLabs. For help with the design I recommend looking at the material posted by flatcat (

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