The device shines a very bright light and measures the light it receives back.
I'm guessing that it isn't that sophisticated of a set up (IE cheap light and/or sensor) and isn't tuned to dark skin. Kind of like a cheap camera struggles to get the contrast right when someone with dark skin and someone with light skin are in the same photo.
The device shines a very bright light and measures the light it receives back.
I'm guessing that it isn't that sophisticated of a set up (IE cheap light and/or sensor) and isn't tuned to dark skin. Kind of like a cheap camera struggles to get the contrast right when someone with dark skin and someone with light skin are in the same photo.
It's not a problem of calibration, it just doesn't work: there's too much melanin in between the oximeter and the flesh it's trying to illuminate.