infrared

It's using an LED which much more efficient than a Kerosene powered flame, since most of the energy in the flame is spent in infrared.

The energy absorbed by interstellar gas and dust doesn't just disappear, it's re-emitted at (mostly) infrared wavelengths.

The upshot is that it is nowhere near blindingly obvious, and we don't currently have the ability to differentiate between a natural or artificial infrared source.

For infrared, water vapor really messes up the light, like trying to see through fog.

What does a dim infrared source look like (if even visible at all)?

AIR being active infrared as opposed to passive (or a particular waveband)?

Use an infrared thermometer on your pans when heating oil, and you'll soon get a feel for what temperatures are produced by your usual methods.

We're using infrared sensors to detect ingresses and egresses from locations.

You don't have to resort to infrared sensors in order to provide anonymity, but they do inherently limit you potential accuracy and metrics you can prodive.

Does your infrared band penetrate polyesters but not cotton?

Two closely situated, parallel infrared distance sensors.

I wonder if you could use glider technology to host a telescope, similar (but much, much smaller) to the Stratospheric Observatory for Infrared Astronomy [1], which is mounted in a 747.

The "spectra" that heat would be vented at is infrared, which is infrared no matter the source.

PayPal started in 1999 as a way to "beam" money from one Palm Pilot to another via the infrared port.

For instance, A search for a complete Dyson swarm can be done by looking for "stars" which only emit radiation in the far infrared.

For example we have `press` to send an infrared signal ("press a button on the remote control"), but that will never throw unless you've forgotten to plug in your infrared emitter.