Person portrait in UV, Vis, NIR, SWIR

[nickspiker]

Ultraviolet, visible, infrared, short wave infrared comparison

UV taken with a full spectrum Sony A7, and the filter stack consists of Schott UG11 - 2mm, Schott 8612 - 2mm, and interference film coating that blocks from 600-900nm

Vis taken with a standard Sony A7

IR taken with a full spectrum Sony A7 and a Hoya R72

SWIR taken with http://www.infraredl...ve_Camera.shtml and a 1500nm long pass filter

The dark skin in the SWIR shot is because the water absorption at 1450nm http://upload.wikime..._absorption.png

[nfoto]

Now, that is an intriguing example of spectral responses. The short wave IR (1450-1550 nm) is generally stated to be outside the photoactinic range, so I would dearly love to have the technical details behind this and the other samples shown.

 

Welcome to the forum, by the way.

[Shane]

Nice example. Since 1450-1550nm exceeds the band gap of silicon, I assume this is some form of hyperspectral imager incorporating an InGaAs focal plane array imager? Looking forward to finding out.

[colinbm]

Thanks for posting this here Nick, it deserves the attention.

At what wavelength does the transition of reflecting light clear skin become absorbing black ?

Cheers

Col

[Andrea B.]

Oh man that is a very cool shot in the looooongwave IR range.

Do please give us some details about that shot!!

 

My (uneducated) guess on this one is that the long IR has penetrated well beneath the skin and is revealing blood???

 

This is a great comparison photograph for illustration of the 'look' of various wavelengths.

I look forward to more interesting work from you.

[nickspiker]

Nice example. Since 1450-1550nm exceeds the band gap of silicon, I assume this is some form of hyperspectral imager incorporating an InGaAs focal plane array imager? Looking forward to finding out.

Germanium sensor

[nickspiker]

Thanks for posting this here Nick, it deserves the attention.

At what wavelength does the transition of reflecting light clear skin become absorbing black ?

Cheers

Col

Right above 1400nm it turns jet black

[nickspiker]

Oh man that is a very cool shot in the looooongwave IR range.

Do please give us some details about that shot!!

 

My (uneducated) guess on this one is that the long IR has penetrated well beneath the skin and is revealing blood???

 

This is a great comparison photograph for illustration of the 'look' of various wavelengths.

I look forward to more interesting work from you.

Not so much blood, as it is water in the skin

[JCDowdy]

Germanium?

I was going to guess InGaAs too!

 

I have been reading up on these http://www.sensorsinc.com/index.html but not bought one yet, now must reconsider!

 

Your link has a brochure that calls the camera a Ge enhanced CMOS with VIS-NIR-SWIR range 300-1600nm.

 

Pretty cool stuff man! http://www.imagesensors.org/Past%20Workshops/2009%20Workshop/2009%20Papers/053_paper_ackland_noblepeak_swir.pdf

 

So what does it do with your UV filter stack mounted on it?????

 

And welcome by the way!!

- John

[nickspiker]

Germanium?

I was going to guess InGaAs too!

 

I have been reading up on these http://www.sensorsinc.com/index.html but not bought one yet, now must reconsider!

 

Your link has a brochure that calls the camera a Ge enhanced CMOS with VIS-NIR-SWIR range 300-1600nm.

 

Pretty cool stuff man! http://www.imagesens...lepeak_swir.pdf

 

So what does it do with your UV filter stack mounted on it?????

 

And welcome by the way!!

- John

I've obsessed over sensorsinc for a while too, haven't we all :)

I'd like to see the 2,000nm band and see what things look like there, but I have a bit to discover at 1,500nm first

Haven't tried UV with it yet, but I thought about it, and it will happen, and you guys will hear about it soon!

[OlDoinyo]

That last shot is a good demonstration of the O-H symmetric and asymmetric stretching modes of the water molecule. I've seen that absorption in many a spectrum, but never in an image before.