Apparatus and method for using a counter-propagating signal method for locating events
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United States of America Patent
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Mar 3, 2009
Grant Date -
Aug 14, 2008
app pub date -
Feb 13, 2007
filing date -
Feb 13, 2007
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Abstract
An apparatus and method for using a counter-propagating signal method for locating events is disclosed. The apparatus and method uses a Mach Zehnder interferometer through which counter-propagating signals can be launched. If the sensing zone of the Mach Zehnder interferometer is disturbed, modified counter-propagating signals are produced and the time difference between receipt of those signals is used to determine the location of the event. A microcontroller receives feedback signals which adjusts polarisation controllers so that the polarisation states of the counter-propagating signals can be controlled to match the amplitude and/or phase of the output signals. Detectors are provided for detecting the modified signals.
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