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Thread: will a laser distance sensor work in this configuration?

  1. #1
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    Default will a laser distance sensor work in this configuration?

    Here's a very simplified diagram: Any ideas if this will work? And anyone know if the reduced beam brightness from doing this will affect the readings of a standard ir laser distance sensor?
    Last edited by shoujin; 04-18-2018 at 11:35.

  2. #2
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    ... could work, if the reflectivity of the IR spot is high enough and not "outshined" by the visible projection -- but I think, the freeform mirror will change the spot size of the IR-beam, so add an error as radius-offset ...

    Viktor

  3. #3
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    I just realized I missed the most important part, the sensor I'm thinking of using. It is a Time-of-Flight Distance Sensor.
    Last edited by shoujin; 04-19-2018 at 18:06.

  4. #4
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    ... at first I thought of a triangulation sensor - there the angle error would be an issue ... then too, the IR laser spot could possibly be outshined by visible light.

    But with a TOF sensor this should be less of an issue - the pulse only has to be bright enough to compensate for the losses on the way ...

    Viktor

  5. #5
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    thank you, feel confident enough now to buy one for testing

  6. #6
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    Even though I've ordered one to test out there are too many variables why this may not work (beam brightness being one) other than this one I am about to mention to determine to real issue. So any opinions would help. Heres the thing, the specifications of the sensor states a "FOV of 25 degrees". I'm not really sure what that FOV means here. The beam is reflected back to the detector and filtered by a pinhole. There's a pinhole, so what would be the point of such a high divergence, if that is what FOV means?
    Last edited by shoujin; 04-18-2018 at 11:36.

  7. #7
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    Take care to select a "hot mirror" that is coated to reflect IR at 45deg incidence.
    If not stated otherwise most IR mirrors/filters are meant to be used at right-angle.

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