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UVC video on YouTube

Video Multispectral SWIR
16 replies to this topic

#1 Stefano

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Posted 03 June 2021 - 20:08

A short YouTube video that includes a 254 nm clip: https://youtu.be/CaXzgumCn34. The gear they use is interesting.

Edited by Stefano, 03 June 2021 - 22:36.


#2 Andy Perrin

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Posted 03 June 2021 - 20:43

Stefano that’s the same lens and image intensifier that Jonathan, David and I bought awhile back!

#3 Stefano

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Posted 03 June 2021 - 20:54

I actually did wonder one moment if it was the same, but I didn’t check. Well, that’s even better. This shows what it can do.

#4 dabateman

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Posted 03 June 2021 - 22:00

Yep pretty poor imaging off a focusing screen. The pi monochrome is much better.
Even my Em5mk2 in high resolution mode is fun.

#5 Stefano

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Posted 03 June 2021 - 22:36

They also have some SWIR:
https://youtu.be/zkHG7CEK2Fs
https://youtu.be/6s3-Vcabl20
https://youtu.be/KTDrAhMNphs

And there are thermal IR videos too.

#6 dabateman

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Posted 03 June 2021 - 22:57

Actually the amazing bits from that imager is the filter and the lens. My filter is extremely excellent at UVC and fully blocked into uvA, visible and IR.
The other amazing thing is that 60mm lens. It has almost no focus shift at 254nm and visible, but ton in uvA, uvb and ir. I don't know how they did that. Also mine doesn't hotspot at 254nm. My UAT does at 254nm. So it works better for UVC imaging.

#7 Andy Perrin

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Posted 03 June 2021 - 23:00

Those Aurora things look neat.

#8 dabateman

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Posted 04 June 2021 - 04:59

Actually this is really cool. Took me a second to figure out what is going on:
https://youtu.be/6VwETtkj1Bo


#9 Andy Perrin

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Posted 04 June 2021 - 05:05

View Postdabateman, on 04 June 2021 - 04:59, said:

Actually this is really cool. Took me a second to figure out what is going on:
https://youtu.be/6VwETtkj1Bo
Now there's something nobody has played with very much here: phosphorescence. (Credit to Stefano showing you can deactivate phosphorescence with red light, but aside from that I don't recall any other discussion here.)

Edited by Andy Perrin, 04 June 2021 - 05:09.


#10 dabateman

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Posted 04 June 2021 - 05:13

The videos I think tell the story. Only one in UVC, total nothing else.
Two UV induced fluorescent with these night vision systems.
And a whole bunch in SWIR and NIR.


#11 Stefano

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Posted 04 June 2021 - 07:06

View PostAndy Perrin, on 04 June 2021 - 05:05, said:

Now there's something nobody has played with very much here: phosphorescence. (Credit to Stefano showing you can deactivate phosphorescence with red light, but aside from that I don't recall any other discussion here.)
I don't remember where I discovered this effect (by "discovered" I mean read somewhere), but I think I already knew it when this video came out: https://youtu.be/4ONp_McwJS0

In fact I remember that when he talked about it at ~7:34, saying "Here's an effect I can't quite explain" I was like "I know the explanation!". Someone of course explained it in the comments.

He got that 375 nm UV laser for $80 on eBay. As he said, Thorlabs charges $4300 for one of them. It's here if you want to look at it: https://www.thorlabs...ctgroup_id=5400

On eBay doing a quick search you can find this: https://www.ebay.com/itm/154079947629. Less powerful than Thorlabs laser (16 mW vs. 70 mW), but it still should contain an actual UV laser diode. If someone ever thinks to buy it, please take it with a grain of salt. I'm not saying there is surely a working laser inside, but there is the possibility.



I still have to experiment with phosphorescence and SWIR. If SWIR light can "erase" it, then you can build a SWIR camera, but it won't be very efficient and the image quality is probably going to be very poor. But it will work. Maybe someone will try this before me and show us.

#12 dabateman

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Posted 04 June 2021 - 07:15

Well its possible most of what we call UVIIRF is actually phosphorescence.
These Aurora cameras are just CMOS sensors and the company website only claims up tp 1100nm. So your not really seeing much SWIR with these. They are 0.9 Mpixel, so you get some sensitivity in the dark.
I think my monochrome Pi HQ sensor might be better. Or my Lodestar camera. If only a better software interface existed for the Lodestar. than it would really be a useful camera.

What really sells these Aurora cameras is they are almost military grade and can handle the recoil from a weapon, thus easily mounted on your AR of choice for full personal protection. Yes I watched too many reviews. I may now get some Guns and Ammo ads.

Edited by dabateman, 04 June 2021 - 07:18.


#13 Andy Perrin

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Posted 04 June 2021 - 14:58

“ Well its possible most of what we call UVIIRF is actually phosphorescence. ”
That doesn’t make much sense to me. The distinction between fluorescence and phosphorescence is the time it takes for the light to decay after you switch the UV off. I’ve never noticed the UVIIRF hanging around much after shutting off the light?

#14 Stefano

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Posted 06 June 2021 - 22:39

Another SWIR video: https://youtu.be/stNkfbRgkjc

The colors in the full-spectrum camera are odd, especially the green sky.

#15 Andy Perrin

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Posted 06 June 2021 - 23:07

What they are calling SWIR seems to be just 1100nm stuff. I asked the guy, he said it wasn’t like InGaAs range.

#16 Stefano

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Posted 06 June 2021 - 23:10

So they are just pushing silicon sensors to their limit. I like to define SWIR as beyond 1100 nm.

#17 Andy Perrin

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Posted 06 June 2021 - 23:11

Yes, it’s still just silicon. In fact, from watching other videos on that Aurora, it seems to be not much more sensitive than my A7S.