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

darkdimension asked on June 03, 2018 02:15
157 | 2 answers | #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


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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2 Answers

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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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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