I have industrial camera. Its model is BFLY-23S6M as depicted below. This camera is used for license plate recognition. A 850nm infra-red projector is near the camera. As I know it is better to reject visible light.
There is a mirror-like object after the sensor. You can see it in silver color. I want to know what it is, and what its usage is. Is it a filter (eg, anti-glare or band pass)?
From the documentation, I know the transparent filter (for monochrome) and non-transparent filter used for color cameras. This mirror-like one is a custom user installed and is not a default just for dust protection.