Night Vision Equipment

I have a question about Night Vision Equipment. I know NV works by sending out an invisible beam and enhancing that beam. What happens if more then one person is using NV equipment at the same time and in the same area?

I am asking because of a ghost hunting show that was on. In the show several people were using NV equipment and they recorded shadows that looked like people. The shadows appeared in front of near by trees and basically in front of the cameras. Specifically I saw 3 people with goggles, 2 cameras and one thermal camera that also had night vision.

To me this shows that the people using NV behind the camera man were casting beams from several angles that caused shadows from the people around. The show claims that these are shadows of ghost children.
If they don’t send out a beam then what is the green light along side the lens?

NGV’s do not send out a beam, they amplify ambient light. They also pick up IR light.

Gordini GG 12 Contender Night and Day Goggles

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