Question: UV measurements

exekutive is asking a question about spectrometry
Follow this topic

by exekutive | November 06, 2018 01:47 | #17475


Would a webcam based spectrometer be able to measure UVA spectra? (in the region of 350-400nm) How deep into UV are webcams usually sensitive to?

I would like to test UV LEDs that I buy online, and verify that they emit the correct wavelength of light.



5 Comments

Hi! I think most webcams can't see much lower than 400nm, but if your sample flouresces in the visible range, you can read that...

There's been some tests to see if certain image sensors (rear-illuminated CMOS) can sense lower than that, but glass blocks most of it, so there might have to be non-glass (pinhole?) optics... and there is sometimes glass over the sensor. So it quickly becomes pretty complex!

https://publiclab.org/tag/uv?page=2

Jeff

On Tue, Nov 6, 2018 at 11:32 AM \<notifications@publiclab.org> wrote:

UV measurements was tagged with #question:spectrometry by warren

Read and respond to the post here: https://publiclab.org/notes/exekutive/11-06-2018/uv-measurements

You received this email because it was tagged with: question:spectrometry.

To change your preferences, please visit https://publiclab.org/subscriptions.

Report spam and abuse to: moderators@publiclab.org

Check out the blog at https://publiclab.org/blog | Love our work? Become a Public Lab Sustaining Member today at https://publiclab.org/donate
Reply with the email you use at PublicLab.org and your comment will be posted to the website.

--
Post to this group at plots-spectometry@googlegroups.com
 

Public Lab mailing lists (http://publiclab.org/lists) are great for discussion, but to get attribution, open source your work, and make it easy for others to find and cite your contributions, please publish your work at http://publiclab.org

You received this message because you are subscribed to the Google Groups "plots-spectrometry" group.
To unsubscribe from this group and stop receiving emails from it, send an email to plots-spectrometry+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Is this a question? Click here to post it to the Questions page.

Reply to this comment...


Hmm, perhaps a better detector would be a SiC photodiode.

Reply to this comment...


I'm currently looking at the VEML6075 to detect UVA and UVB. It seems to be what I might call "semi-calibrated" that is you can use default settings to get a rough idea of the intensity.

Reply to this comment...


Thanks, that's an interesting device. But it is only sensitive to two very narrow frequency bands.

Reply to this comment...


Are there any materials which fluoresce only under a fairly narrow band around 365nm?

Is this a question? Click here to post it to the Questions page.

Reply to this comment...


Log in to comment