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I'm working on a small sensor system that responds to only UV light and I wanted to know that is there any way to differentiate between UV light and the rest of the spectrum like using lens if so then what kind of lens to be used etc. Kindly share your thoughts.

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  • $\begingroup$ Do you have a single UV wavelength you'd like to detect, or are you interested in the UV spectrum? $\endgroup$
    – Semoi
    Dec 27, 2020 at 10:23
  • $\begingroup$ only 315nm wavelength is required for the sensor. $\endgroup$
    – GURU PRASAD A S
    Dec 27, 2020 at 10:29

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Use a prism to disperse the light by wavelength, and then just put the sensor where the UV part of the spectrum falls, or physically block out the wavelengths that you don't want.

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    $\begingroup$ Or a diffraction grating. One could use a Compact Disk. Transmission gratings are more convenient. With a recordable CD it is easiest to remove the metallic layer. (But the plastic will absorb the shortest wavelengths.) $\endgroup$
    – user137289
    Dec 27, 2020 at 10:11
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Buy a bandpass filter, which transmits around 315nm. A bandpass filter is a "glass plate", which absorb "all" wavelength except some within a certain wavelength range. Look at the transmission spectrum of the bandpass filer and check whether or not this is acceptable.

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