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Old 11-04-2010, 10:32 AM #17
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Default Re: Not quite sure how to do this, fiber optic cable help

I think this is an IR distance measuring unit, it uses a pulsed light source to distinguish it's signal from the background and has two photodiodes to collect and backrefelcting light.
Those two photodiodes have lenses in front of them, but they "look" in different directions. So depending on the distance of and object in front, either the left or right photodiode will give a signal. Because the laser is slightly to the side, the light will come from the side if an object is close, but almost straight on if the object is far away.
Moving the light source or detector would change this principle. So unless this is a different device than I think it is, fibers aren't the way to go.


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Old 11-05-2010, 02:46 AM #18
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Default Re: Not quite sure how to do this, fiber optic cable help

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Originally Posted by Bluefan View Post
I think this is an IR distance measuring unit, it uses a pulsed light source to distinguish it's signal from the background and has two photodiodes to collect and backrefelcting light.
Those two photodiodes have lenses in front of them, but they "look" in different directions. So depending on the distance of and object in front, either the left or right photodiode will give a signal. Because the laser is slightly to the side, the light will come from the side if an object is close, but almost straight on if the object is far away.
Moving the light source or detector would change this principle. So unless this is a different device than I think it is, fibers aren't the way to go.
Close, the source of the light the sensors are looking for comes from a laser that measures distance over time and then calculates speed. The laser diodes in the unit pictured above then send out pulses to confuse the speed measuring device so it can't measure distance/speed of the object my sensors are mounted on
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Old 11-05-2010, 03:18 AM #19
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Default Re: Not quite sure how to do this, fiber optic cable help

Brilliant... so when you're riding your bike down the street at speeds so dangerously slow, anything with laser vision just sees you as a messy blur.. I like it. Interesting use of fiber optics! I hope your project turns out for the best!
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Old 11-05-2010, 03:46 AM #20
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Default Re: Not quite sure how to do this, fiber optic cable help

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Brilliant... so when you're riding your bike down the street at speeds so dangerously slow, anything with laser vision just sees you as a messy blur.. I like it. Interesting use of fiber optics! I hope your project turns out for the best!
haha you got the right idea thanks
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Old 11-08-2010, 11:17 PM #21
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Default Re: Not quite sure how to do this, fiber optic cable help

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Close, the source of the light the sensors are looking for comes from a laser that measures distance over time and then calculates speed. The laser diodes in the unit pictured above then send out pulses to confuse the speed measuring device so it can't measure distance/speed of the object my sensors are mounted on
Sorry, I'm not gonna help you avoid speed tickets and probably breaking the law. Have fun and take care.
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Old 11-11-2010, 10:04 PM #22
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Default Re: Not quite sure how to do this, fiber optic cable help

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Sorry, I'm not gonna help you avoid speed tickets and probably breaking the law. Have fun and take care.
I understand your position. Just to clarify the speeding part is the only aspect of this that is actually breaking the law. Where I currently live anyway.
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Old 11-14-2010, 06:38 PM #23
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Default Re: Not quite sure how to do this, fiber optic cable help

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I understand your position. Just to clarify the speeding part is the only aspect of this that is actually breaking the law. Where I currently live anyway.
When the LIDAR reads "E7", //range gate error or jamming//, let us know how the cop treats you.


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