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  <div class="vevent h-event"> <h1 class="summary p-name">EAST Knowledge - Locating Intrusions Using Fiber Optics</h1> <div class='date'><time class="dtstart dt-start" title="2015-04-18T10:30:00" datetime="2015-04-18T10:30:00">Saturday, April 18, 2015 from 10:30am</time>–<time class="dtend dt-end" title="2015-04-18T12:00:00" datetime="2015-04-18T12:00:00">noon</time></div> <div class="location vcard p-location h-card"> <a class="url" href='http://calagator.org/venues/202394882'><span class='fn org p-name'>Gresham Library Story Room</span></a> <div class="adr p-adr h-adr"> <div class="street-address p-street-address">385 NW Miller Ave</div> <span class="locality p-locality">Gresham</span> , <span class="region p-region">OR</span> <span class="postal-code p-postal-code">97030</span> <div class="country-name p-country-name">US</div> (<a href='https://maps.google.com/maps?q=385%20NW%20Miller%20Ave,%20Gresham%20OR%2097030%20US'>map</a>) </div> </div> <div class="description p-description"> <p>EAST Knowledge invites you to attend our fifth meeting! <em>All</em> are welcome!</p> <ul> <li> <strong>What:</strong> Locating Intrusions Using Fiber Optics</li> <li> <strong>Who:</strong> Jim Rulla</li> <li> <strong>Where:</strong> The Story Room at the Gresham Library</li> <li> <strong>When:</strong> 10:30am-Noon, Saturday, April 18, 2015</li> <li> <strong>Why:</strong> Sharing what we know</li> </ul> <p>Interferometers measure distances to within fractions of the wavelength of light. Put a couple of these incredibly sensitive devices on the fence around an airport, and you can not merely detect a would-be intruder — you can locate him. Put a pair on a pipeline, and you can not merely detect nearby digging that could damage the pipe — you can locate its source. You might even be able to detect — and perhaps even locate — leaks in the pipe.</p> <p>The detection and location mechanisms are fascinating examples of clever engineering. I'll explain how these patented systems work and illustrate new algorithms that improve performance.</p> <ul> <li><a href="https://en.wikipedia.org/wiki/Interferometry">Wikipedia page on interferometers</a></li> </ul> </div> <h3>Links</h3> <ul> <li><a class="url u-url" href="http://eastknow.org">Website</a></li> </ul> </div>