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

closed as off-topic by mattdm, xiota, Hueco, Tetsujin, scottbb Aug 16 at 13:54

  • This question does not appear to be about photography within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

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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. – mattdm Aug 13 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 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. – mattdm Aug 13 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 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". – mattdm Aug 13 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.

  • 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 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 at 15:51

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