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OPT3001-Q1: Sensor Maximum Blockage and Aim Angle

Dale Echlin
Prodigy 10 points
Part Number: OPT3001-Q1

Tool/software:

Hello,

I am looking into a scenario where the sensor cone of vision is blocked by about 30% and aimed about 12° away from the targeted environment (the visual environment that a driver is supposed to see).

I am wondering if a TI tech could help answer these questions below:

1. What is the recommended maximum blockage the sensor can handle? (Can we exceed 30% - is there any tolerance?).

2. What is the recommended maximum angle the sensor can be aimed away from its targeted source? (Could this be aimed higher if needed?).
- Our concerns about aiming too high would be about picking up any light from overhead streetlamps.


Thank you!

  • 0
    TI__Expert 3530 points

    Hi Dale,

    Regarding your first question, could you clarify what you mean when you say you expect the FOV of the sensor to be blocked by 30%? Are you saying that part of the sensing area is being covered, which would affect the overall response of the sensor? Or are you saying that the field of view of the sensor is restricted by 30%? I do not have a recommended maximum blockage I can provide here, but if you could send me an image of the device and it's FOV cone, as well as the portion of the FOV that is blocked, this would help me assist further. 

    As previously mentioned, I also can not recommend a "maximum angle", this really depends on your system requirements and the kind of performance you are looking to achieve from the sensor. Please see the angular response of the sensor from the datasheet:

    At 12 degrees, the device will still be seeing light from the light source; however, the sensor's response will be reduced according to the graph in the datasheet. Whether or not you can increase this angle depends on the kind of reduction in response you are comfortable with. Again, if you could provide clarity on why you are wanting to increase this angle, it would be very helpful.

    Thanks,

    Daniel

  • 0 in reply to Daniel Balmaceda
    Prodigy 10 points

    Hey Daniel, 

    Thank you for your quick response, that is greatly appreciated. To answer your question below:

    - The sensor field of view is being restricted by some surrounding vehicle environments.

    With the increased angle, we understand there will be a reduction in response. I guess our concern from there is, when does the sensor start picking up light from overhead streetlights and interfere with its intended purpose (of responding to the driver's view/environment).

    Here is a little sketch of the scenario:

    I also found this graph which showcases the half-power angle for reference.

  • 0 in reply to Dale Echlin
    TI__Expert 3530 points

    Hi Dale,

    Thanks for clarifying here. Is the diagram you sent above an accurate representation of the sensor's position? It seems to me that based on the position you have depicted, any overhead streetlights would be entering the sensing area at a more extreme angle, and the sensor's response is greatly reduced at these extreme angles. I can not comment on a "maximum angle", as it would depend on the amount of overhead light you are ok with seeing without having a significant impact on the total output. Has the device performance been tested under the given conditions? Varying the angle of the device would give you a better indicator of the influence of the outside light on your system.

    Thanks,

    Daniel

  • 0 in reply to Daniel Balmaceda
    Prodigy 10 points

    Hey Daniel, it has not been tested yet. We wanted to check with TI first to see if you have any insights about it. Not just with the angle but the obstructed field of view as well.

  • 0 in reply to Dale Echlin
    TI__Expert 3530 points

    Hey Dale,

    And there is no way to shift the position of the sensor so the device gets the full field of view? Is this a fixed position? Since you are only interested in the environmental light seen directly in front of the passengers vision, you should still be able to get good performance from the device even with the reduced FOV.

    Thanks,

    Daniel

  • 0 in reply to Daniel Balmaceda
    Prodigy 10 points

    Hey Daniel,

    Yeah, it's unfortunately in a fixed position which is why we're investigating how far we can aim it upwards past the blocked area.

    Thank you for your feedback,

    Dale.