LI Beam Dimensions?

[Oyusan]

Hey I was wondering...

What is the area covered by a LI jammer head at 1000ft?

I know the diode is polarized, and I am trying to picture the coverage in my head.

Thanks,

-Oyu

[calpalmer]

This is a good question, and relates to one I've wondered about -- mounting non-recessed so as to have good reception of an over-pass or off-angle type shot... but the dispersion of the responding signal is still straight down the road to whatever dimensions it has... I'm not totally understanding how the counter-measure works in those kinds of Lidar shots.

Cal

[Oyusan]

I wonder the same things..

someone help us!

Oh hey Cal, nice car/laser combo. Did you ever post your install pics? I'd really like to see. I think I'm gonna get a 550i and I need ideas. =)

Ty

-Oyu

EDIT:

Nevermind... Found it! http://www.kodakgallery.com/gallery/..._photos_button

[fulcrum]

Hey I was wondering...

What is the area covered by a LI jammer head at 1000ft?

I know the diode is polarized, and I am trying to picture the coverage in my head.

Thanks,

-Oyu

Assuming an Osram SPL PL90_3 (75 Watt) pulse laser is used without lens:

Horizontal around 2x 20deg : (sin(20) * 1000ft) * 2 = 700ft
Vertical around 2x 7deg : (sin(7) * 1000ft) * 2 = 250ft

So this laser would project an oval of around 700x250ft @ 1000ft distance

At the edges the intensity of the laserlight is around 20% of the intensity in the center.

By using a lens in front of the laser, you can change this pattern of course.

[Oyusan]

Thank you, this answers my question. I wonder how the LI lense focuses them.. like if they make the beam smaller but more powerful for an area.

[calpalmer]

I wonder the same things..

someone help us!

Oh hey Cal, nice car/laser combo. Did you ever post your install pics? I'd really like to see. I think I'm gonna get a 550i and I need ideas. =)

Ty

-Oyu

EDIT:

Nevermind... Found it! KODAK Gallery | Photo Merchandise

Yes I did: http://www.radardetector.net/forums/...-bmw-550i.html

[calpalmer]

Bump

Any comment on the LI's signal beam dimensions related to hitting a Lidar gun on an overpass or serious off-angle? How does that work, anyway, since we work so hard to get the alignment level and down the road?

[Won Hunglo]

Keep in mind that the gun has to look into the beam's source for reflections so it is more than the beam size being projected that comes into play.

[calpalmer]

OK... but I still am not "seeing" how the emanation from the jammer diodes hit the off-angle gun to jam, IF it has a similarly tight dispersion dimension. Maybe it doesn't, I'm not sure but someone here surely knows how this works.

[Stealth Stalker]

It has to do more than just hit it to jam it. Sunlight "hits" my eyes all day long, but it doesn't blind me until I look straight into it.