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September 25, 2013

Mtg: Laser Interferometers and Quintessential Phase: Overcoming Turbulence

by @ 5:31 pm. Filed under ALL, Computers/Software, NanoEngineering, Optics/Displays, Semiconductors

FRIDAY October 4, 2013
SCV Computational Intelligence Chapter
Speaker: Danny Abramovitch; Agilent Laboratories
Time: 1:30 PM – 2:30 PM
Cost: none
Place: CMU SV, Rm 118, Building 19, Moffett Field
RSVP: not required

Laser interferometers are amazingly precise measurement tools for making non-contact measurements with sub nanometer precision over a huge dynamic range . In reality a laser interferometer measures not distance, but the change in optical path length between itself and a moving object.  This measurement relies on a precision knowledge of the laser wavelength, which can be affected by a number of factors, including, and most annoyingly, turbulence.  Turbulence, in this case pressure variations of air in the measurement path, have vexed interferometry for years, yielding a variety of methods to reduce the consequences.  Most recently, the method called Quintessential Phase (QP) was developed which using a multi-segment optical detector and an Extended Kalman Filter, makes the  turbulence observable so that it can be removed from the distance calculation.  This talk will give a brief introduction to laser interferometry before discussing the turbulence problem and the QP solution.



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