eli5 what is this iconic high pitched sound you hear, when a movie or game character activates night vision goggles? Is this a real thing?

Question

eli5 what is this iconic high pitched sound you hear, when a movie or game character activates night vision goggles? Is this a real thing?

In: Technology

Answer 1

It’s not nearly as noticeable in real life with most night vision nods you would see. You can hear it if you’re the person wearing them as they first turn on, but it’s very faint and there’s little to no noise while they’re running. My experience is limited to a handful of night vision nods from late 90s to pre 2010.