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  1. #1
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    Default 2 laser different diode

    I noticed that the 905 model has two laser diodes that are different in appearance, does anyone know why? Is it possible that they are for different wavelengths?

  2. #2
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    Default Re: 2 laser different diode

    There aren't two laser diodes. One is a laer diode, the other is a LED diode. The LED diode provides a more divergent transmit beam.

  3. #3
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    Default Re: 2 laser different diode

    Quote Originally Posted by RadarGeek View Post
    There aren't two laser diodes. One is a laer diode, the other is a LED diode. The LED diode provides a more divergent transmit beam.
    What is it good for?

  4. #4
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    Default Re: 2 laser different diode

    Most laser diodes beam is more eliptical than circular. The jammer companies have generally oriented the diode such that the beam is wider than tall. The use of LED helps to give additional vertical protection.

  5. #5
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    Default Re: 2 laser different diode

    Quote Originally Posted by RadarGeek View Post
    Most laser diodes beam is more eliptical than circular. The jammer companies have generally oriented the diode such that the beam is wider than tall. The use of LED helps to give additional vertical protection.
    I know all about the laser diode, but its not logical to use both, the up/doun rise time is different and 1 led have no real power to overcome the original pulse return...

  6. #6
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    Default Re: 2 laser different diode

    Quote Originally Posted by ECM View Post
    Quote Originally Posted by RadarGeek View Post
    Most laser diodes beam is more eliptical than circular. The jammer companies have generally oriented the diode such that the beam is wider than tall. The use of LED helps to give additional vertical protection.
    I know all about the laser diode, but its not logical to use both, the up/doun rise time is different and 1 led have no real power to overcome the original pulse return...
    Yes, their rise and fall times are very different, as well as the LED is much less powerful compared to the laser diode. It is not overpowering the laser beam, but beating the LIDAR's clock that jams the LIDAR.

  7. #7
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    Default Re: 2 laser different diode

    Quote Originally Posted by ECM View Post
    Quote Originally Posted by RadarGeek View Post
    Most laser diodes beam is more eliptical than circular. The jammer companies have generally oriented the diode such that the beam is wider than tall. The use of LED helps to give additional vertical protection.
    I know all about the laser diode, but its not logical to use both, the up/doun rise time is different and 1 led have no real power to overcome the original pulse return...
    You misunderstand the concept of using both!RadarGeek IS correct.
    It is not about "overcoming" the Original pulse,it is all about "seeing" the pulse in the first place.You also forget about the "inverse-distance square law".The Lidar pulse has to make two (2) trips--"out" & "return".
    The Blinder only has to make ONE (1) trip to the Lidar gun.
    Plus don't forget...the EMF wavefront is ever expanding in divergence w/ each foot of distance traveling which greatly dissipates its strength over the full total distance.

  8. #8
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    Default Re: 2 laser different diode

    It is also my understanding that the LED in the HP905's are used in parking assist, the laser diode remains off for parking, which is a good thing.


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  9. #9
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    Default Re: 2 laser different diode

    Quote Originally Posted by OpenRoad View Post
    It is also my understanding that the LED in the HP905's are used in parking assist, the laser diode remains off for parking, which is a good thing.
    Thats sound like the real reson for the led...

 

 

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