How does night vision goggles work?
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The Wikipedia article [https://en.wikipedia.org/wiki/Night-vision_device](https://en.wikipedia.org/wiki/Night-vision_device) has all the answers you need.
Basically it combines amplification of low-intensity visible light sources with an infrared camera to create an image in near total darkness.
I recently bought a smartphone with an infrared camera, and it works quite well as a night-vision device when viewed in grayscale in a totally dark room with some warm sources (like a mini-refrigerator). The warm sources produce invisible infrared energy that illuminates the surroundings, and it’s all picked up by the infrared camera.
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