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.

Camera with reflective surface visible

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    I'm voting to close this question as off-topic because this is about a camera used for license plate recognition, not photography. – Please Read My Profile Aug 13 '19 at 9:23
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    This is photography but not by human. Photography: "the art or process of producing images by the action of radiant energy and especially light on a sensitive surface (such as film or an optical sensor)." If it is not, please refer me which branch of stackexchange can I ask such questions. – Babak.Abad Aug 13 '19 at 9:32
  • But are you actually producing images? It sounds like the output of your process is actually a license plate number, not a photograph. This is important because your camera and whatever modification it has is not closely related to the art, science, and business of producing actual photographs. I don't know if there is a more relevant Stack Exchange site — there isn't necessarily one for everything. – Please Read My Profile Aug 13 '19 at 9:36
  • If a tree falls in a forest and lands on a remote shutter release and no one is around to see it it, does it make a s̶o̶u̶n̶d photograph? – uhoh Aug 13 '19 at 11:09
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    I'm not saying this as a matter of abstract philosophical debate. I want this to be a site about photography, not about "technical processes which may involve a camera but have an entirely different set of constraints and expertise from that which applies to photography". – Please Read My Profile Aug 13 '19 at 13:26

Maybe the camera has been equipped as an infrared camera? The infrared filter should then reflect visible light since absorbing it would result in a heat source right before the sensor which would interfere with infrared imaging.

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  • Interfere with? More like, damage the equipment: You'd need deep-frying temperatures at least for the IR to show up on a non far-IR sensor. – rackandboneman Aug 12 '19 at 15:42
  • My guess is that it is infra red filter. Please refer some filters like this one, specially mirror-like ones – Babak.Abad Aug 12 '19 at 15:51

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