Category Archives: Interesting Stuff

And now for something completely different … 40 different projects

Thermal infrared camera

Thermal infrared camera of dog split screen

Got my thermal infrared camera attachment for my Samsung phone.  Here with a split regular camera and Thermal, showing the carpet to be 20 deg C. The dogs ear was 33 deg C.
Note that this is not a camera picking up infrared lights but true thermal imaging using long wave infrared 7.2 – 13 microns with vanadium oxide microbolometer array. (Visible light is 0.4 to 0.7 microns).

IRFrontView

This is made by Seek Thermal for something like $ 200 US.

IRCupMocedThreshold35C

It is the Seek Thermal. I’ve not done comparative measurements with near IR temp probes and thermocouples. I guess I would have to come up to speed with emissivity at the different wavelengths.
Interestingly the sky is -14 degrees at that wavelength. When reflected off a tin roof, the sky reflection can confuse things.

http://www.thermal.com/thermal-cameras
http://www.engineeringtoolbox.com/emissivity-coefficients-d_447.html

 

Phosphorescent sheet

Phosphorescent sheet with smiley face after exposure to the sun with some duct tape to mask the light

A large phosphorescent sheet with a “smiley” has been made from some black duct tape, exposed to the sun for 5 minutes and brought inside. The tape was removed leaving a “shadow” seen here. The candle is the “standard” light source.

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Fluorescein Display II

Fluorescein Display - looks like a spirit screaming back at meNow this is trippy. I knocked this up for my 2014 Open Day. Fluorescein powder dropped on a 3 foot column of water and lit by a 3 W UV light.  In slow motion, the green fluorescent liquid forms inverted mushrooms, swirls, sheets and eddies which are constantly moving.
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