If I've got an infrared LED that I want to use in a remote-control application, how can I measure the spread of the output? I imagine with a visible-light LED you'd just put it up against a sheet of paper and rotate it while keeping an eye on the light cone formed on the paper, but that's a bit difficult to do with something you can't actually see...
My first instinct is to use a digital camera, though from the previous thread regarding IR LEDs I made, the ones typically used in remote controls (~940nm wavelength) don't show up nearly as well on cameras. Would taking the IR filter out of such a camera solve my issue?
In addition to this, I assume the best way to get the longest range out of my control system is to be running the LEDs at full power, or close to it - maybe even overdriving them since the control protocol only pulses the LED for a brief period of time.