Tag Archives: light

Seeing in Infrared

I’ve been doing some research on different types of vision, and apparently what we humans see is the visible wavelength of light – i.e. the colours you see in a rainbow. But many animals, and especially insects, see things we can’t. For example, the humble goldfish can see in both infrared and ultraviolet wavelengths.

Without getting too technical, think of wavelengths as a line of spaghetti of different lengths, from shortest to longest. The shortest bits are in the ultraviolet wavelength. The longest bits are in the infrared wavelength, and there in the middle are the colours we humans can see. Blue is longer than ultraviolet and red is shorter than infrared.

For the purposes of my research, infrared was what I was looking for, but what is it, and what does it look like?

We can’t see infrared, not with the naked eye, but we can feel it because infrared is basically the wavelength of ‘heat’. In visual terms, the colder something is, the darker it appears. The hotter something is, the brighter it looks.

Confused? Good, so was I. As a visual creature, I needed to be able to visualise something that is essentially, invisible. Luckily, we have developed special cameras that can:

  • detect infrared wavelengths, and
  • translate them into colours on the visible spectrum – i.e. into colours we can see.

Generally speaking, infrared cameras translate cold images into dark colours such as dark blue or dark purple. As areas of an image warm up, the heat is translated into brighter colours – from red to orange to yellow to white.

In the screenshot below, the infrared camera shows a cold frying pan on a stove top [the yellow labels are mine]:

To get an idea of what the camera sees as the pan heats up, please have a look at this short video on the National Geographic website:


It’s only a very short video [1.18 minutes] and well worth the look [if you have a phobia about mosquitoes, avert your eyes for the first twenty seconds or so]. Isn’t that amazing?

More on why I’m doing this research at a later date. 😀




CLIP – a new kind of 3D printing

The one problem with printing ‘layers’ of material is that it leaves ridges. Those ridges can be seen quite clearly in this example of super large scale 3D printing:


But 3D printing is still in its infancy. Allow me to introduce CLIP, a new kind of 3D printing invented by ‘…two chemists and a physicist, ..[who].. came in with a different perspective.’ That perspective is ‘continuous liquid interface production technology’, CLIP for short.

‘To create an object, CLIP projects specific bursts of light and oxygen. Light hardens the resin, and oxygen keeps it from hardening. By controlling light and oxygen exposure in tandem, intricate shapes and latices can be made in one piece instead of the many layers of material that usually make up a 3-D printed object.’

That’s the gist of it, but if you go to the Washington Post article here, you can get a much better understanding of the process. You can also watch two amazing time-lapse video clips that show the magic of CLIP at work [pun intended]. 😉






Can you guess what this is?

Oh no, it's that time of year again...

Oh no, it’s that time of year again…

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