New GeoDesy Auto Focus System

 

GeoDesy just added an absolutely revolutional feature to their model lineup:

 Auto Focus...

To understand what this does for you, you need to first understand the definition of the term "beam divergence rate".

 The beam divergence rate of a Free-Space Optics link specifies the rate at which the beam spreads out as distance increases.

Always expressed in milliradians (mrad), a 1 mrad beam would deliver a 0.5m diameter beam circle at 500m, and a 1m beam circle diameter at 1km.

Until now all Free-Space Optics links have has a preset beam divergence rate; low for long distance (usually 1-3 mrad), high for short (usually 3-mrad).

 

This fact creates two issues with all current Free-Space Optics links:

1. The low divergence rate on long distance links does its job of uping the optical margin required at long distances, but makes stable alignment for reliable beam targeting challenging.

2. The high divergence rate on short distance links does its job of delivering a usable beam diameter (in spite of not having much distance to spread out) but decreases optical margin on a geometric scale (2x beam diameter = 25% optical margin). And in some cases, even the increased 3-4 mrad divergence rate delivers a beam to small to stay on target (extreme wind gusts, high expansion of surfaces caused by solar heating and expansion of the surfaces. But setting a fixed divergence rate at more than 4 mrad means there might not be enough optical margin to penetrate adverse atmospheric conditions (fog/rain/snow). And at the very least, would severely limit the effective distance.

 

 

GeoDesy's new Auto Focus feature works to deliver the highest optical margin (via the lowest divergence rate) achievable while responding to any mistargeting by increasing the divergence rate just enough to stay on target. It operates on a very simple "get the most margin but no mis-targeting" algorythm.

 

Genious is often found hiding in simplicity! "Proof's in the pudding"...it really works!

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