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IR test equipment on your pocket

by 2 weeks ago - last edited 2 weeks ago

Ever need to know if the IR LEDs in your UniFi Camera are operating?   How about seeing if the SFP is putting out light or not?   Or if you're getting light transmitted down the fiber you just installed LC connectors on?    Turns out the piece of test equipment you need is probably in your pocket right now...


The camera in your smart phone is actually sensitive to Infrared light (just like the G3 camera above).   But unlike a full-fledged camera, most Smartphones don't have an IR cut filter - not enough space and it's really not needed.   This means it can see infrared which your eye can not.   So just point your camera at the IR source and see if it shows up


This is a photo of an SFP module plugged into a switch - an 850nm MM one in this case.   And again the IR clearly shows up as a red dot.   And this works with nore than just MM units:


Here is a SingleMode 1310nm SFP - smaller red dot, but it's clearly there.   Much smaller because this is single mode, but still clearly visible.


Works at the fiber end too - the camera picks it right up.   No more guessing if the cable is good or if there's light getting all the way to your end - you can clearly see it.   And this works with any IR device you have - want to see if the TV remote is working?


A general warning - never look directly into the SFP port with the naked eye, especially single mode ones - the IR level can damage your eye.   But with the camera that issue goes away.   I wouldn't shove the fiber end right into the camera lens, but leaving a few inches allows enough dispersion that it's safe.





" How can anyone trust Scientists? If new evidence comes along, they change their minds! " Politician's joke (sort of...)

"Humans are allergic to change..They love to say, ‘We’ve always done it this way.’ I try to fight that. "Admiral Grace Hopper, USN, Computer Scientist

The are also cameras which allow you to see in the duck: https://www.youtube.com/watch?v=MDomiR1_7pw


I thought "duck" was an auto-correct for a fat fingered "dark" until I clicked on the link.  ROFLMAO


Cellphone cams have been used by perps to detect cameras for years.  They also have apps that send out a light and look for it to be reflected by the camera lens.


Being too cheap to buy a VFL for my personal use, I drilled out the front of my flashlight that has a laser pointer and used epoxy to fix an ST barrel connector to it.