Which sensors track hands on the HoloLens 2?

Question

I've been testing the HoloLens 2 in a completely dark environment and I noticed that hands are still being tracked. I was wondering if the Depth-Camera was able to do so, but I cannot imagine its capability to be so good since it has a low resolution. I mean, the RGB camera (and Stereo-Cameras?) should not be able to see anything in this situation.
Furthermore the eyes are not being tracked in a dark environment, even though the IR-Cameras are not dependant on human visible light.

What am I missing?

Answer 1

Hello, Welcome to Microsoft Q&A,

Questions about HoloLens devices are not currently covered on Q&A. The HoloLens/HoloLens Development tag is specifically for technical questions about developing applications for HoloLens.

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Answer 2

The primary sensor responsible for hand tracking on HoloLens 2 is the "HoloLens 2 Hand Tracking Sensor,"

HoloLens 2 is equipped with depth-sensing camera that uses time-of-flight (ToF) technology > emits infrared light > measures the time it takes for the light to bounce off objects and return to the sensor.

HoloLens 2 includes an IMU that consists of accelerometers and gyroscopes. The IMU helps track the headset's orientation and movement.

Eye-tracking Cameras also helps in sensing.

Developers can access hand tracking functionality through the HoloLens 2 development kit, which provides APIs and tools to create applications that leverage these sensors for hand tracking and interaction.