Long Distance Vision Application.

• MartyG

  • August 17, 2023 11:24
  • Edited

  Hi Bharat Gupta  If long range depth sensing is required then the RealSense D455 will be the best choice of camera model, as it can depth-sense up to 20 meters.  The link below has a demonstration of this.

  https://support.intelrealsense.com/hc/en-us/community/posts/17214523195155-Camera-for-power-line-inspection

   

  In regard to infrared sensing, RealSense cameras can see much further as the depth distance limitation does not apply to infrared and RGB.  If you only need infrared and will not be using depth sensing then any RealSense camera model except D405 (the short-range model with high-quality images) should meet your long-distance requirements.

   

  If you require a wide field of view then the D415 model will not be suitable for your needs.

   

  If you choose D435 / D435i / D435f / D435if or the D455 / D455f then the field of view values for the infrared sensor in these models are:

  Horizontal Field of View 90
  Vertical Field of View 64
  Diagonal Field of View 98 

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• Bharat Gupta

  • August 17, 2023 12:55

  Hi MartyG,

  Thanks for getting back.  Your answer is helpful, but I was kind of looking at distances of tens of KM,.  I can do 360 degrees by installing 4 cameras based on the information provided.  I really need a longer range and the application is outdoor-so it has to work in -40 degree centigrade to +55 degree ambient temperatures.

  I am not sure, from what little I have read about the system, it will be suitable.  What do you think?

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• MartyG

  • August 17, 2023 13:27

  The infrared image would be comparable to a monochrome RGB image.  So if you pointed the camera out of a window in a high building and there were mountains in the far distance, it should certainly capture the mountains just as an RGB photo would.

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• MartyG

  • August 17, 2023 13:29

  In regards to temperature, the internal operating temperature of the camera is recommended to be between 0 and 35 degrees C (though in practice it could reach 42 degrees before problems may manifest in the image above that temperature). 

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• MartyG

  • August 17, 2023 13:30

  Apologies for posting one paragraph at a time.  The site will not list the comment otherwise right now.

   

  The temperature that the outer casing of the camera is exposed to will have an effect on its internal operating temperature.  For example, an Intel lab test found that if the outer casing temperature does not exceed 44 degrees C then the internal operating temperature should not exceed 60 degrees C.

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• MartyG

  • August 17, 2023 13:31

  RealSense cameras have a built-in laser safety mechanism in their firmware driver that monitors the internal temperature and shuts off the laser if the internal temperature exceeds 60 degrees C or falls below 0 degrees C. 

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• MartyG

  • August 17, 2023 13:31

  Laser shut-off does not prevent the camera from operating, though the infrared image will likely be darker and the camera would not be able to provide an infrared image at night unless an external infrared light source such as an IR illuminator lamp was installed nearby so that the camera could use that light source instead of the laser light.

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• MartyG

  • August 17, 2023 13:32

  If the ambient temperature was sub-zero then the internal operating temperature would likely not be as low as the outer environment because of the heat generated from the electronics.  Maximizing the Laser Power setting of the camera could also help to raise its internal temperature.

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• MartyG

  • August 17, 2023 13:32

  For use in all weathers outdoors, the D457 model may suit your needs best as it has IP65 rating that protects it from dust and water entry.

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• MartyG

  • August 17, 2023 13:33

  RealSense cameras can be placed inside a custom-built protective housing in very extreme environments, such as the example below.

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• MartyG

  • August 17, 2023 13:33

  

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